250 lines
45 KiB
XML
250 lines
45 KiB
XML
<document id="9FD06877E36A840E252721ECAFF16C05" ID-DOI="10.11646/phytotaxa.207.3.5" ID-ISSN="1179-3163" ID-Zenodo-Dep="13637299" IM.bibliography_approvedBy="felipe" IM.illustrations_approvedBy="felipe" IM.materialsCitations_approvedBy="felipe" IM.metadata_approvedBy="felipe" IM.taxonomicNames_approvedBy="felipe" IM.treatmentCitations_approvedBy="felipe" IM.treatments_approvedBy="felipe" checkinTime="1725337009674" checkinUser="felipe" docAuthor="Sterrenburg, Frithjof A. S., Stidolph, Stuart R., Sar, Eugenia A. & Sunesen, Inés" docDate="2015" docId="8F0876277C11FFD1FFE757BFFED0FD6C" docLanguage="en" docName="phytotaxa.207.3.5.pdf" docOrigin="Phytotaxa 207 (3)" docSource="http://dx.doi.org/10.11646/phytotaxa.207.3.5" docStyle="DocumentStyle:96748F8F1B6C902996E134952A3A36B9.13:Phytotaxa.2014-.journal_article" docStyleId="96748F8F1B6C902996E134952A3A36B9" docStyleName="Phytotaxa.2014-.journal_article" docStyleVersion="13" docTitle="Pleurosigma acus A. Mann 1925" docType="treatment" docVersion="2" lastPageNumber="279" masterDocId="73310E5F7C14FFD7FF6F5721FF94FFE1" masterDocTitle="A comparative study of Pleurosigma subrectum and P. acus (Bacillariophyta)" masterLastPageNumber="280" masterPageNumber="273" pageNumber="278" updateTime="1725341224209" updateUser="ExternalLinkService" zenodo-license-figures="UNSPECIFIED" zenodo-license-treatments="UNSPECIFIED">
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<mods:titleInfo id="25949F4F5047F07E57F68E3E52566EF1">
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<mods:title id="C3F93E7D73F38048DF4206BF0ECEEC32">A comparative study of Pleurosigma subrectum and P. acus (Bacillariophyta)</mods:title>
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<mods:name id="7641EA4C472869032203A8FF062CA24B" type="personal">
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<mods:namePart id="A3331A6922779181D1DAF18EBBA483D2">Sterrenburg, Frithjof A. S.</mods:namePart>
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<mods:affiliation id="200B4A2923ABC8B6DED5FFAB096D86E5">Stationsweg 158, 1852 LN Heiloo, the Netherlands.</mods:affiliation>
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<mods:namePart id="5703129308EAA6E7DACAA090D97A3197">Stidolph, Stuart R.</mods:namePart>
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<mods:affiliation id="4A879C12ED3406317A53223506176418">3 / 15 Gebbie Rd., Taradale, Napier, New Zealand.</mods:affiliation>
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<mods:namePart id="8C5DB777493BA941F2B472E4EAC379B8">Sar, Eugenia A.</mods:namePart>
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<mods:affiliation id="C75DE5F02A6352D51F38F421AA1B208D">División Ficología, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Paseo del Bosque s / n, 1900 La Plata, Argentina.</mods:affiliation>
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<mods:namePart id="ACE886563500D6F98FB98F5E2C4437CC">Sunesen, Inés</mods:namePart>
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<mods:affiliation id="EAD26FD1DE69FA872DBDBFBFF3AB16E6">División Ficología, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Paseo del Bosque s / n, 1900 La Plata, Argentina.</mods:affiliation>
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<mods:title id="943BADA1F15BD534E607DF3C2EAAB973">Phytotaxa</mods:title>
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<mods:part id="46EA20E1B4D25E84E0EB56C7AC133952">
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<mods:date id="91F03F14738DD319176436734218A143">2015</mods:date>
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<mods:number id="8DCBD13BB66A43D9A6ABF23E0B2945CF">2015-05-11</mods:number>
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<mods:number id="D6A0BB3CB297985C2DE56A212BF116D1">207</mods:number>
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<mods:classification id="1002BCCC4123544F64FAD29BAB3CBC35">journal article</mods:classification>
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<treatment id="8F0876277C11FFD1FFE757BFFED0FD6C" LSID="urn:lsid:plazi:treatment:8F0876277C11FFD1FFE757BFFED0FD6C" httpUri="http://treatment.plazi.org/id/8F0876277C11FFD1FFE757BFFED0FD6C" lastPageId="6" lastPageNumber="279" pageId="5" pageNumber="278">
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<subSubSection id="4FBB94BA7C11FFD2FFE757BFFB3CFF58" box="[136,1192,158,185]" pageId="5" pageNumber="278" type="nomenclature">
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<paragraph id="071EC7317C11FFD2FFE757BFFB3CFF58" blockId="5.[136,1192,158,185]" box="[136,1192,158,185]" pageId="5" pageNumber="278">
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<heading id="5C56705D7C11FFD2FFE757BFFB3CFF58" box="[136,1192,158,185]" fontSize="11" level="2" pageId="5" pageNumber="278" reason="3">
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<treatmentCitationGroup id="27B1E01F7C11FFD2FFE757BFFB3CFF58" box="[136,1192,158,185]" pageId="5" pageNumber="278">
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<treatmentCitation id="8600E1207C11FFD2FFE757BFFDD0FF58" author="Mann, A." box="[136,580,158,185]" page="132" pageId="5" pageNumber="278" year="1925">
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<taxonomicName id="C0A1BCB27C11FFD2FFE757BFFDD0FF58" authority="A. Mann (1925: 132" authorityName="A. Mann" authorityYear="1925" box="[136,580,158,185]" class="Bacillariophyceae" family="Pleurosigmataceae" genus="Pleurosigma" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="5" pageNumber="278" phylum="Bacillariophyta" rank="species" species="acus">
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<emphasis id="35D51B237C11FFD2FFE757BFFEC2FF58" bold="true" box="[136,342,158,185]" italics="true" pageId="5" pageNumber="278">Pleurosigma acus</emphasis>
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A.
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<bibRefCitation id="6330BAC07C11FFD2FE105781FDD0FF58" author="Mann, A." box="[383,580,160,185]" pageId="5" pageNumber="278" pagination="1 - 182" refId="ref4454" refString="Mann, A. (1925) Marine diatoms of the Philippine Islands. United States National Museum Bulletin 100 6 (1): 1 - 182." type="journal article" year="1925">Mann (1925: 132</bibRefCitation>
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</taxonomicName>
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</treatmentCitation>
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||
, pl. 29, figs. 4 and 5) (
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<figureCitation id="9F9ADBB47C11FFD2FC2E5781FC5EFF58" box="[833,970,160,185]" captionStart="FIGURES 12−19" captionStartId="4.[136,243,1983,2004]" captionTargetBox="[170,1416,389,1958]" captionTargetId="figure-85@4.[170,1416,389,1958]" captionTargetPageId="4" captionText="FIGURES 12−19. Pleurosigma acus, LM. 12−14, 18. Lectotype. 15−17, 19. Epitype specimen. All BF. 18, 19. Greatly enlarged detail of lectotype (Fig. 18) and epitype (Fig. 19) striation to facilitate verification of identical stria density and stria angle. Scale bars = 20 μm (Figs. 12−15), 5 μm (Figs. 16−19)." figureDoi="http://doi.org/10.5281/zenodo.13637307" httpUri="https://zenodo.org/record/13637307/files/figure.png" pageId="5" pageNumber="278">Figs. 12−19</figureCitation>
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, LM; 20−24, SEM)
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||
</treatmentCitationGroup>
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</heading>
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</paragraph>
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||
</subSubSection>
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<subSubSection id="4FBB94BA7C11FFD2FFE757E0FC25FF36" box="[136,945,192,216]" pageId="5" pageNumber="278" type="reference_group">
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<paragraph id="071EC7317C11FFD2FFE757E0FC25FF36" blockId="5.[136,945,192,216]" box="[136,945,192,216]" pageId="5" pageNumber="278">
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<treatmentCitationGroup id="27B1E01F7C11FFD2FFE757E0FC25FF36" box="[136,945,192,216]" pageId="5" pageNumber="278">
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=
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<taxonomicName id="C0A1BCB27C11FFD2FFF157E0FEFFFF39" authority="Cleve" authorityName="Cleve" authorityYear="1880" box="[158,363,193,216]" class="Bacillariophyceae" family="Pleurosigmataceae" genus="Pleurosigma" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="5" pageNumber="278" phylum="Bacillariophyta" rank="species" species="subrectum">
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<emphasis id="35D51B237C11FFD2FFF157E0FEB2FF39" box="[158,294,193,216]" italics="true" pageId="5" pageNumber="278">P. subrectum</emphasis>
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Cleve
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</taxonomicName>
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in
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<treatmentCitation id="8600E1207C11FFD2FEE257E0FD21FF39" author="Cleve, P. T. & Grunow, A." box="[397,693,193,216]" page="53" pageId="5" pageNumber="278" year="1880">
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<bibRefCitation id="6330BAC07C11FFD2FEE257E0FD21FF39" author="Cleve, P. T. & Grunow, A." box="[397,693,193,216]" pageId="5" pageNumber="278" pagination="1 - 121" refId="ref4419" refString="Cleve, P. T. & Grunow, A. (1880) Beitrage zur Kenntniss der Arctischen Diatomeen. Kongliga Svenska Vetenskaps Akademiens Handlingar 17 (2): 1 - 121." type="journal article" year="1880">Cleve & Grunow (1880: 53</bibRefCitation>
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</treatmentCitation>
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||
, pl. 3, fig. 72)
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||
<emphasis id="35D51B237C11FFD2FC3D57E1FC25FF36" bold="true" box="[850,945,192,215]" italics="true" pageId="5" pageNumber="278">syn. nov.</emphasis>
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</treatmentCitationGroup>
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</paragraph>
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||
</subSubSection>
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||
<subSubSection id="4FBB94BA7C11FFD1FFE75629FE7BFE70" lastPageId="6" lastPageNumber="279" pageId="5" pageNumber="278" type="materials_examined">
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<paragraph id="071EC7317C11FFD2FFE75629FD29FEA4" blockId="5.[136,1452,264,433]" pageId="5" pageNumber="278">
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<emphasis id="35D51B237C11FFD2FFE75629FF7CFEC0" bold="true" box="[136,232,264,289]" pageId="5" pageNumber="278">Type:—</emphasis>
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<collectionCode id="61B05FF47C11FFD2FF875629FEABFEC0" box="[232,319,264,289]" country="USA" httpUri="http://biocol.org/urn:lsid:biocol.org:col:34871" lsid="urn:lsid:biocol.org:col:34871" name="Smithsonian Institution, National Museum of Natural History" pageId="5" pageNumber="278" type="Museum">USNM</collectionCode>
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! #3278 and #3279, (both selected specimens.) of which #3278 was designated the
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<typeStatus id="D81A79937C11FFD2FBBC5629FABEFEC0" box="[1235,1322,264,289]" pageId="5" pageNumber="278" type="syntype">syntype</typeStatus>
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in
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<bibRefCitation id="6330BAC07C11FFD2FA225629FF47FEA4" author="Stidolph, S. R." pageId="5" pageNumber="278" pagination="273 - 284" refId="ref4864" refString="Stidolph, S. R. (2002) Observations and remarks on the morphology and taxonomy of the diatom genera Gyrosigma Hassall and Pleurosigma W. Smith. V. Pleurosigma types of A. Mann (1925): a critical re-investigation. Micropaleontology 48 (3): 273 - 284. http: // dx. doi. org / 10.1661 / 0026 - 2803 (2002) 048 [0273: OAROTM] 2.0. CO; 2" type="journal article" year="2002">Stidolph (2002)</bibRefCitation>
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and #3279 is the
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<typeStatus id="D81A79937C11FFD2FEF6560DFD94FEA4" box="[409,512,300,325]" pageId="5" pageNumber="278" type="lectotype">lectotype</typeStatus>
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here designated.
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</paragraph>
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<paragraph id="071EC7317C11FFD2FFD25671FB93FE50" blockId="5.[136,1452,264,433]" pageId="5" pageNumber="278">
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<emphasis id="35D51B237C11FFD2FFD25671FE1CFE88" bold="true" box="[189,392,336,361]" pageId="5" pageNumber="278">
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<typeStatus id="D81A79937C11FFD2FFD25671FE8EFE88" box="[189,282,336,361]" pageId="5" pageNumber="278" type="epitype">Epitype</typeStatus>
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material
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</emphasis>
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:
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<collectingCountry id="7FB687A17C11FFD2FEF75671FD95FE88" box="[408,513,336,361]" name="Brazil" pageId="5" pageNumber="278">BRAZIL</collectingCountry>
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||
.
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<collectingRegion id="C56509D37C11FFD2FD625671FD17FE88" box="[525,643,336,361]" country="Brazil" name="Sao Paulo" pageId="5" pageNumber="278">Sao Paulo</collectingRegion>
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: Toque-Toque Grande Beach, Sao Sebastiao, 23° 83’ S,
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<geoCoordinate id="6295A1F67C11FFD2FA6B5671FAECFE88" box="[1284,1400,336,361]" degrees="45" direction="west" minutes="51" orientation="longitude" pageId="5" pageNumber="278" precision="925" value="-45.85">45° 51’ W</geoCoordinate>
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,
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<emphasis id="35D51B237C11FFD2FAE75671FD93FE6C" italics="true" pageId="5" pageNumber="278">
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Dr. Ricardo Tsukamoto,
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<date id="731FE1F17C11FFD2FE005655FD93FE6C" box="[367,519,372,397]" pageId="5" pageNumber="278" value="2012-06-30">30 June 2012</date>
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</emphasis>
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, leg.
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<collectionCode id="61B05FF47C11FFD2FD295655FDCEFE6C" box="[582,602,372,397]" country="Chile" name="Departamento de Geologia, Universidad de Chile" pageId="5" pageNumber="278">R</collectionCode>
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||
.Y. Tsukamoto (in collections Sterrenburg #724 and Herbario Maria Eneyda P.K. Fidalgo, Instituto de Botanica de
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<collectingRegion id="C56509D37C11FFD2FD5C56B9FD30FE50" box="[563,676,408,433]" country="Brazil" name="Sao Paulo" pageId="5" pageNumber="278">Sao Paulo</collectingRegion>
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#SP 428.775), here designated.
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</paragraph>
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<caption id="53DE97B97C11FFD2FFE75162FCF6F8D1" ID-DOI="http://doi.org/10.5281/zenodo.13637309" ID-Zenodo-Dep="13637309" httpUri="https://zenodo.org/record/13637309/files/figure.png" pageId="5" pageNumber="278" startId="5.[136,243,1603,1624]" targetBox="[151,1436,457,1577]" targetPageId="5" targetType="figure">
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<paragraph id="071EC7317C11FFD2FFE75162FCF6F8D1" blockId="5.[136,1453,1603,1840]" pageId="5" pageNumber="278">
|
||
<emphasis id="35D51B237C11FFD2FFE75162FEA8F9B9" bold="true" box="[136,316,1603,1624]" pageId="5" pageNumber="278">FIGURES 20−24.</emphasis>
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||
<emphasis id="35D51B237C11FFD2FE2C5162FE62F9B9" box="[323,502,1603,1624]" italics="true" pageId="5" pageNumber="278">
|
||
<taxonomicName id="C0A1BCB27C11FFD2FE2C5162FE65F9B9" box="[323,497,1603,1624]" class="Bacillariophyceae" family="Pleurosigmataceae" genus="Pleurosigma" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="5" pageNumber="278" phylum="Bacillariophyta" rank="species" species="acus">Pleurosigma acus</taxonomicName>
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,
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||
</emphasis>
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||
epitype material except for Fig. 24, SEM. 20. Valve centre, external. Valve morphogenesis not yet finished, tegumental layer in process of formation. Note absence of septa (arrow). Central raphe fissures almost overlap. 21. Valve apex, external. Left arrow marks apical pore, right arrow marks accessory fissure terminating within raphe “hook”. 22. Valve centre, internal. Note double areolar openings (see enlarged inset) and elevated central raphe nodule. 23. Valve apex, internal. Note double areolae. Prominent helictoglossa, arrow (see enlarged inset) marks apical pore. 24. Developing valve, tegumental layer not yet deposited. Specimen from California, USA, examined in
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||
<bibRefCitation id="6330BAC07C11FFD2FE8051D6FD73F8ED" author="Sterrenburg, F. A. S. & Tiffany, M. A. & Castillo, M. E." box="[495,743,1783,1804]" pageId="5" pageNumber="278" pagination="140 - 145" refId="ref4736" refString="Sterrenburg, F. A. S., Tiffany, M. A. & Meave del Castillo, M. E. (2005) Valve morphogenesis in the diatom genus Pleurosigma W. Smith (Bacillariophyceae) - Nature's alternative sandwich. Journal of Nanoscience and Nanotechnology 5 (1): 140 - 145. http: // dx. doi. org / 10.1166 / jnn. 2005.012" type="journal article" year="2005">
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||
Sterrenburg
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||
<emphasis id="35D51B237C11FFD2FD0651D6FD08F8ED" box="[617,668,1783,1804]" italics="true" pageId="5" pageNumber="278">et al.</emphasis>
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||
(2005)
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||
</bibRefCitation>
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||
. Note non-loculate valve structure and hollow columns (black arrow at centre). Scale bars = 5 μm (Fig. 22), 2 μm (Figs 20, 21, 23), 1 μm (Fig. 24).
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||
</paragraph>
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||
</caption>
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||
<paragraph id="071EC7317C11FFD2FFD2507BFB10F83E" blockId="5.[136,1452,1882,2087]" pageId="5" pageNumber="278">
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||
<emphasis id="35D51B237C11FFD2FFD2507BFEE9F892" bold="true" box="[189,381,1882,1907]" pageId="5" pageNumber="278">LM description</emphasis>
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||
:
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||
<emphasis id="35D51B237C11FFD2FEEB507BFE34F892" bold="true" box="[388,416,1882,1907]" pageId="5" pageNumber="278">—</emphasis>
|
||
Valves fusiform, non-sigmoid (
|
||
<figureCitation id="9F9ADBB47C11FFD2FC62507BFC0FF892" box="[781,923,1882,1907]" captionStart="FIGURES 12−19" captionStartId="4.[136,243,1983,2004]" captionTargetBox="[170,1416,389,1958]" captionTargetId="figure-85@4.[170,1416,389,1958]" captionTargetPageId="4" captionText="FIGURES 12−19. Pleurosigma acus, LM. 12−14, 18. Lectotype. 15−17, 19. Epitype specimen. All BF. 18, 19. Greatly enlarged detail of lectotype (Fig. 18) and epitype (Fig. 19) striation to facilitate verification of identical stria density and stria angle. Scale bars = 20 μm (Figs. 12−15), 5 μm (Figs. 16−19)." figureDoi="http://doi.org/10.5281/zenodo.13637307" httpUri="https://zenodo.org/record/13637307/files/figure.png" pageId="5" pageNumber="278">Figs. 12−15</figureCitation>
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||
),
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||
<emphasis id="35D51B237C11FFD2FCD9507BFC43F892" box="[950,983,1882,1907]" italics="true" pageId="5" pageNumber="278">ca.</emphasis>
|
||
170–250 μm long,
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||
<emphasis id="35D51B237C11FFD2FBD4507BFB49F892" box="[1211,1245,1882,1907]" italics="true" pageId="5" pageNumber="278">ca.</emphasis>
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||
17−22 μm wide, with acute apices. Raphe sternum non-sigmoid throughout but helictoglossae very slightly deflected (
|
||
<figureCitation id="9F9ADBB47C11FFD2FA6E505FFAC1F876" box="[1281,1365,1918,1943]" captionStart="FIGURES 12−19" captionStartId="4.[136,243,1983,2004]" captionTargetBox="[170,1416,389,1958]" captionTargetId="figure-85@4.[170,1416,389,1958]" captionTargetPageId="4" captionText="FIGURES 12−19. Pleurosigma acus, LM. 12−14, 18. Lectotype. 15−17, 19. Epitype specimen. All BF. 18, 19. Greatly enlarged detail of lectotype (Fig. 18) and epitype (Fig. 19) striation to facilitate verification of identical stria density and stria angle. Scale bars = 20 μm (Figs. 12−15), 5 μm (Figs. 16−19)." figureDoi="http://doi.org/10.5281/zenodo.13637307" httpUri="https://zenodo.org/record/13637307/files/figure.png" pageId="5" pageNumber="278">Fig. 16</figureCitation>
|
||
). Striae transverse
|
||
<emphasis id="35D51B237C11FFD2FF905083FEB5F85A" box="[255,289,1954,1979]" italics="true" pageId="5" pageNumber="278">ca.</emphasis>
|
||
<quantity id="C0596AD47C11FFD2FE485083FE1EF85A" box="[295,394,1954,1979]" metricMagnitude="-1" metricUnit="m" metricValue="4.826" metricValueMax="5.08" metricValueMin="4.572" pageId="5" pageNumber="278" unit="in" value="19.0" valueMax="20.0" valueMin="18.0">18−20 in</quantity>
|
||
10 μm, oblique
|
||
<emphasis id="35D51B237C11FFD2FD525083FDCBF85A" box="[573,607,1954,1979]" italics="true" pageId="5" pageNumber="278">ca.</emphasis>
|
||
<quantity id="C0596AD47C11FFD2FD0B5083FD5CF85A" box="[612,712,1954,1979]" metricMagnitude="-1" metricUnit="m" metricValue="4.064" metricValueMax="4.318" metricValueMin="3.81" pageId="5" pageNumber="278" unit="in" value="16.0" valueMax="17.0" valueMin="15.0">15−17 in</quantity>
|
||
10 μm, stria angle 65−68° (
|
||
<figureCitation id="9F9ADBB47C11FFD2FC945083FB15F85A" box="[1019,1153,1954,1979]" captionStart="FIGURES 12−19" captionStartId="4.[136,243,1983,2004]" captionTargetBox="[170,1416,389,1958]" captionTargetId="figure-85@4.[170,1416,389,1958]" captionTargetPageId="4" captionText="FIGURES 12−19. Pleurosigma acus, LM. 12−14, 18. Lectotype. 15−17, 19. Epitype specimen. All BF. 18, 19. Greatly enlarged detail of lectotype (Fig. 18) and epitype (Fig. 19) striation to facilitate verification of identical stria density and stria angle. Scale bars = 20 μm (Figs. 12−15), 5 μm (Figs. 16−19)." figureDoi="http://doi.org/10.5281/zenodo.13637307" httpUri="https://zenodo.org/record/13637307/files/figure.png" pageId="5" pageNumber="278">Figs. 18, 19</figureCitation>
|
||
). Central area small, round (
|
||
<figureCitation id="9F9ADBB47C11FFD2FFFF50E7FF70F83E" box="[144,228,1990,2015]" captionStart="FIGURES 12−19" captionStartId="4.[136,243,1983,2004]" captionTargetBox="[170,1416,389,1958]" captionTargetId="figure-85@4.[170,1416,389,1958]" captionTargetPageId="4" captionText="FIGURES 12−19. Pleurosigma acus, LM. 12−14, 18. Lectotype. 15−17, 19. Epitype specimen. All BF. 18, 19. Greatly enlarged detail of lectotype (Fig. 18) and epitype (Fig. 19) striation to facilitate verification of identical stria density and stria angle. Scale bars = 20 μm (Figs. 12−15), 5 μm (Figs. 16−19)." figureDoi="http://doi.org/10.5281/zenodo.13637307" httpUri="https://zenodo.org/record/13637307/files/figure.png" pageId="5" pageNumber="278">Fig. 17</figureCitation>
|
||
). Central raphe fissures long, almost overlapping and slightly undulating (
|
||
<figureCitation id="9F9ADBB47C11FFD2FB4C50E7FBE2F83E" box="[1059,1142,1990,2015]" captionStart="FIGURES 12−19" captionStartId="4.[136,243,1983,2004]" captionTargetBox="[170,1416,389,1958]" captionTargetId="figure-85@4.[170,1416,389,1958]" captionTargetPageId="4" captionText="FIGURES 12−19. Pleurosigma acus, LM. 12−14, 18. Lectotype. 15−17, 19. Epitype specimen. All BF. 18, 19. Greatly enlarged detail of lectotype (Fig. 18) and epitype (Fig. 19) striation to facilitate verification of identical stria density and stria angle. Scale bars = 20 μm (Figs. 12−15), 5 μm (Figs. 16−19)." figureDoi="http://doi.org/10.5281/zenodo.13637307" httpUri="https://zenodo.org/record/13637307/files/figure.png" pageId="5" pageNumber="278">Fig. 17</figureCitation>
|
||
).
|
||
</paragraph>
|
||
<paragraph id="071EC7317C11FFD1FFD250CBFCFEFE8C" blockId="5.[136,1452,1882,2087]" lastBlockId="6.[136,1452,160,653]" lastPageId="6" lastPageNumber="279" pageId="5" pageNumber="278">
|
||
<emphasis id="35D51B237C11FFD2FFD250CBFE19F7E2" bold="true" box="[189,397,2026,2051]" pageId="5" pageNumber="278">SEM description</emphasis>
|
||
:
|
||
<emphasis id="35D51B237C11FFD2FEFB50CBFE24F7E2" bold="true" box="[404,432,2026,2051]" pageId="5" pageNumber="278">—</emphasis>
|
||
Externally, central raphe fissures long, deflected to the same side, almost overlapping (
|
||
<figureCitation id="9F9ADBB47C11FFD2FFFF5F2FFF72F7C6" box="[144,230,2062,2087]" captionStart="FIGURES 20−24" captionStartId="5.[136,243,1603,1624]" captionTargetBox="[151,1436,457,1577]" captionTargetId="figure-124@5.[151,1436,457,1577]" captionTargetPageId="5" captionText="FIGURES 20−24. Pleurosigma acus, epitype material except for Fig. 24, SEM. 20. Valve centre, external. Valve morphogenesis not yet finished, tegumental layer in process of formation. Note absence of septa (arrow). Central raphe fissures almost overlap. 21. Valve apex, external. Left arrow marks apical pore, right arrow marks accessory fissure terminating within raphe “hook”. 22. Valve centre, internal. Note double areolar openings (see enlarged inset) and elevated central raphe nodule. 23. Valve apex, internal. Note double areolae. Prominent helictoglossa, arrow (see enlarged inset) marks apical pore. 24.Developing valve, tegumental layer not yet deposited. Specimen from California, USA, examined in Sterrenburg et al. (2005). Note non-loculate valve structure and hollow columns (black arrow at centre). Scale bars = 5 μm (Fig. 22), 2 μm (Figs 20, 21, 23), 1 μm (Fig. 24)." figureDoi="http://doi.org/10.5281/zenodo.13637309" httpUri="https://zenodo.org/record/13637309/files/figure.png" pageId="5" pageNumber="278">Fig. 20</figureCitation>
|
||
). Apical raphe fissures sharply deflected and terminally strongly recurving forming a hook (
|
||
<figureCitation id="9F9ADBB47C11FFD2FB985F2FFADFF7C6" box="[1271,1355,2062,2087]" captionStart="FIGURES 20−24" captionStartId="5.[136,243,1603,1624]" captionTargetBox="[151,1436,457,1577]" captionTargetId="figure-124@5.[151,1436,457,1577]" captionTargetPageId="5" captionText="FIGURES 20−24. Pleurosigma acus, epitype material except for Fig. 24, SEM. 20. Valve centre, external. Valve morphogenesis not yet finished, tegumental layer in process of formation. Note absence of septa (arrow). Central raphe fissures almost overlap. 21. Valve apex, external. Left arrow marks apical pore, right arrow marks accessory fissure terminating within raphe “hook”. 22. Valve centre, internal. Note double areolar openings (see enlarged inset) and elevated central raphe nodule. 23. Valve apex, internal. Note double areolae. Prominent helictoglossa, arrow (see enlarged inset) marks apical pore. 24.Developing valve, tegumental layer not yet deposited. Specimen from California, USA, examined in Sterrenburg et al. (2005). Note non-loculate valve structure and hollow columns (black arrow at centre). Scale bars = 5 μm (Fig. 22), 2 μm (Figs 20, 21, 23), 1 μm (Fig. 24)." figureDoi="http://doi.org/10.5281/zenodo.13637309" httpUri="https://zenodo.org/record/13637309/files/figure.png" pageId="5" pageNumber="278">Fig. 21</figureCitation>
|
||
). A long accessory fissure terminates within this hook (
|
||
<figureCitation id="9F9ADBB47C12FFD1FDFF5781FD77FF58" box="[656,739,160,185]" captionStart="FIGURES 20−24" captionStartId="5.[136,243,1603,1624]" captionTargetBox="[151,1436,457,1577]" captionTargetId="figure-124@5.[151,1436,457,1577]" captionTargetPageId="5" captionText="FIGURES 20−24. Pleurosigma acus, epitype material except for Fig. 24, SEM. 20. Valve centre, external. Valve morphogenesis not yet finished, tegumental layer in process of formation. Note absence of septa (arrow). Central raphe fissures almost overlap. 21. Valve apex, external. Left arrow marks apical pore, right arrow marks accessory fissure terminating within raphe “hook”. 22. Valve centre, internal. Note double areolar openings (see enlarged inset) and elevated central raphe nodule. 23. Valve apex, internal. Note double areolae. Prominent helictoglossa, arrow (see enlarged inset) marks apical pore. 24.Developing valve, tegumental layer not yet deposited. Specimen from California, USA, examined in Sterrenburg et al. (2005). Note non-loculate valve structure and hollow columns (black arrow at centre). Scale bars = 5 μm (Fig. 22), 2 μm (Figs 20, 21, 23), 1 μm (Fig. 24)." figureDoi="http://doi.org/10.5281/zenodo.13637309" httpUri="https://zenodo.org/record/13637309/files/figure.png" pageId="6" pageNumber="279">Fig. 21</figureCitation>
|
||
, right arrow) and there is an accessory apical pore (
|
||
<figureCitation id="9F9ADBB47C12FFD1FA485781FAEEFF58" box="[1319,1402,160,185]" captionStart="FIGURES 20−24" captionStartId="5.[136,243,1603,1624]" captionTargetBox="[151,1436,457,1577]" captionTargetId="figure-124@5.[151,1436,457,1577]" captionTargetPageId="5" captionText="FIGURES 20−24. Pleurosigma acus, epitype material except for Fig. 24, SEM. 20. Valve centre, external. Valve morphogenesis not yet finished, tegumental layer in process of formation. Note absence of septa (arrow). Central raphe fissures almost overlap. 21. Valve apex, external. Left arrow marks apical pore, right arrow marks accessory fissure terminating within raphe “hook”. 22. Valve centre, internal. Note double areolar openings (see enlarged inset) and elevated central raphe nodule. 23. Valve apex, internal. Note double areolae. Prominent helictoglossa, arrow (see enlarged inset) marks apical pore. 24.Developing valve, tegumental layer not yet deposited. Specimen from California, USA, examined in Sterrenburg et al. (2005). Note non-loculate valve structure and hollow columns (black arrow at centre). Scale bars = 5 μm (Fig. 22), 2 μm (Figs 20, 21, 23), 1 μm (Fig. 24)." figureDoi="http://doi.org/10.5281/zenodo.13637309" httpUri="https://zenodo.org/record/13637309/files/figure.png" pageId="6" pageNumber="279">Fig. 21</figureCitation>
|
||
, left arrow). Internally, areolar openings generally bisected by a small bar (
|
||
<figureCitation id="9F9ADBB47C12FFD1FCF257E5FC7AFF3C" box="[925,1006,196,221]" captionStart="FIGURES 20−24" captionStartId="5.[136,243,1603,1624]" captionTargetBox="[151,1436,457,1577]" captionTargetId="figure-124@5.[151,1436,457,1577]" captionTargetPageId="5" captionText="FIGURES 20−24. Pleurosigma acus, epitype material except for Fig. 24, SEM. 20. Valve centre, external. Valve morphogenesis not yet finished, tegumental layer in process of formation. Note absence of septa (arrow). Central raphe fissures almost overlap. 21. Valve apex, external. Left arrow marks apical pore, right arrow marks accessory fissure terminating within raphe “hook”. 22. Valve centre, internal. Note double areolar openings (see enlarged inset) and elevated central raphe nodule. 23. Valve apex, internal. Note double areolae. Prominent helictoglossa, arrow (see enlarged inset) marks apical pore. 24.Developing valve, tegumental layer not yet deposited. Specimen from California, USA, examined in Sterrenburg et al. (2005). Note non-loculate valve structure and hollow columns (black arrow at centre). Scale bars = 5 μm (Fig. 22), 2 μm (Figs 20, 21, 23), 1 μm (Fig. 24)." figureDoi="http://doi.org/10.5281/zenodo.13637309" httpUri="https://zenodo.org/record/13637309/files/figure.png" pageId="6" pageNumber="279">Fig. 22</figureCitation>
|
||
—see also inset,
|
||
<figureCitation id="9F9ADBB47C12FFD1FBC257E5FB6AFF3C" box="[1197,1278,196,221]" captionStart="FIGURES 20−24" captionStartId="5.[136,243,1603,1624]" captionTargetBox="[151,1436,457,1577]" captionTargetId="figure-124@5.[151,1436,457,1577]" captionTargetPageId="5" captionText="FIGURES 20−24. Pleurosigma acus, epitype material except for Fig. 24, SEM. 20. Valve centre, external. Valve morphogenesis not yet finished, tegumental layer in process of formation. Note absence of septa (arrow). Central raphe fissures almost overlap. 21. Valve apex, external. Left arrow marks apical pore, right arrow marks accessory fissure terminating within raphe “hook”. 22. Valve centre, internal. Note double areolar openings (see enlarged inset) and elevated central raphe nodule. 23. Valve apex, internal. Note double areolae. Prominent helictoglossa, arrow (see enlarged inset) marks apical pore. 24.Developing valve, tegumental layer not yet deposited. Specimen from California, USA, examined in Sterrenburg et al. (2005). Note non-loculate valve structure and hollow columns (black arrow at centre). Scale bars = 5 μm (Fig. 22), 2 μm (Figs 20, 21, 23), 1 μm (Fig. 24)." figureDoi="http://doi.org/10.5281/zenodo.13637309" httpUri="https://zenodo.org/record/13637309/files/figure.png" pageId="6" pageNumber="279">Fig. 23</figureCitation>
|
||
) except around the elevated central raphe nodule, which is enclosed within two small central bars of approximately equal length (
|
||
<figureCitation id="9F9ADBB47C12FFD1FA1157C9FF3CFEC4" captionStart="FIGURES 20−24" captionStartId="5.[136,243,1603,1624]" captionTargetBox="[151,1436,457,1577]" captionTargetId="figure-124@5.[151,1436,457,1577]" captionTargetPageId="5" captionText="FIGURES 20−24. Pleurosigma acus, epitype material except for Fig. 24, SEM. 20. Valve centre, external. Valve morphogenesis not yet finished, tegumental layer in process of formation. Note absence of septa (arrow). Central raphe fissures almost overlap. 21. Valve apex, external. Left arrow marks apical pore, right arrow marks accessory fissure terminating within raphe “hook”. 22. Valve centre, internal. Note double areolar openings (see enlarged inset) and elevated central raphe nodule. 23. Valve apex, internal. Note double areolae. Prominent helictoglossa, arrow (see enlarged inset) marks apical pore. 24.Developing valve, tegumental layer not yet deposited. Specimen from California, USA, examined in Sterrenburg et al. (2005). Note non-loculate valve structure and hollow columns (black arrow at centre). Scale bars = 5 μm (Fig. 22), 2 μm (Figs 20, 21, 23), 1 μm (Fig. 24)." figureDoi="http://doi.org/10.5281/zenodo.13637309" httpUri="https://zenodo.org/record/13637309/files/figure.png" pageId="6" pageNumber="279">Fig. 22</figureCitation>
|
||
). Helictoglossae prominent, slightly deflected, near the tip there is a small apical pore (
|
||
<figureCitation id="9F9ADBB47C12FFD1FBEB562DFB43FEC4" box="[1156,1239,268,293]" captionStart="FIGURES 20−24" captionStartId="5.[136,243,1603,1624]" captionTargetBox="[151,1436,457,1577]" captionTargetId="figure-124@5.[151,1436,457,1577]" captionTargetPageId="5" captionText="FIGURES 20−24. Pleurosigma acus, epitype material except for Fig. 24, SEM. 20. Valve centre, external. Valve morphogenesis not yet finished, tegumental layer in process of formation. Note absence of septa (arrow). Central raphe fissures almost overlap. 21. Valve apex, external. Left arrow marks apical pore, right arrow marks accessory fissure terminating within raphe “hook”. 22. Valve centre, internal. Note double areolar openings (see enlarged inset) and elevated central raphe nodule. 23. Valve apex, internal. Note double areolae. Prominent helictoglossa, arrow (see enlarged inset) marks apical pore. 24.Developing valve, tegumental layer not yet deposited. Specimen from California, USA, examined in Sterrenburg et al. (2005). Note non-loculate valve structure and hollow columns (black arrow at centre). Scale bars = 5 μm (Fig. 22), 2 μm (Figs 20, 21, 23), 1 μm (Fig. 24)." figureDoi="http://doi.org/10.5281/zenodo.13637309" httpUri="https://zenodo.org/record/13637309/files/figure.png" pageId="6" pageNumber="279">Fig. 23</figureCitation>
|
||
, arrow). Basal and tegumental layers joined by columns (
|
||
<figureCitation id="9F9ADBB47C12FFD1FD5C5611FD12FEA8" box="[563,646,304,329]" captionStart="FIGURES 20−24" captionStartId="5.[136,243,1603,1624]" captionTargetBox="[151,1436,457,1577]" captionTargetId="figure-124@5.[151,1436,457,1577]" captionTargetPageId="5" captionText="FIGURES 20−24. Pleurosigma acus, epitype material except for Fig. 24, SEM. 20. Valve centre, external. Valve morphogenesis not yet finished, tegumental layer in process of formation. Note absence of septa (arrow). Central raphe fissures almost overlap. 21. Valve apex, external. Left arrow marks apical pore, right arrow marks accessory fissure terminating within raphe “hook”. 22. Valve centre, internal. Note double areolar openings (see enlarged inset) and elevated central raphe nodule. 23. Valve apex, internal. Note double areolae. Prominent helictoglossa, arrow (see enlarged inset) marks apical pore. 24.Developing valve, tegumental layer not yet deposited. Specimen from California, USA, examined in Sterrenburg et al. (2005). Note non-loculate valve structure and hollow columns (black arrow at centre). Scale bars = 5 μm (Fig. 22), 2 μm (Figs 20, 21, 23), 1 μm (Fig. 24)." figureDoi="http://doi.org/10.5281/zenodo.13637309" httpUri="https://zenodo.org/record/13637309/files/figure.png" pageId="6" pageNumber="279">Fig. 24</figureCitation>
|
||
), which are hollow (black arrow in
|
||
<figureCitation id="9F9ADBB47C12FFD1FB7B5611FBF3FEA8" box="[1044,1127,304,329]" captionStart="FIGURES 20−24" captionStartId="5.[136,243,1603,1624]" captionTargetBox="[151,1436,457,1577]" captionTargetId="figure-124@5.[151,1436,457,1577]" captionTargetPageId="5" captionText="FIGURES 20−24. Pleurosigma acus, epitype material except for Fig. 24, SEM. 20. Valve centre, external. Valve morphogenesis not yet finished, tegumental layer in process of formation. Note absence of septa (arrow). Central raphe fissures almost overlap. 21. Valve apex, external. Left arrow marks apical pore, right arrow marks accessory fissure terminating within raphe “hook”. 22. Valve centre, internal. Note double areolar openings (see enlarged inset) and elevated central raphe nodule. 23. Valve apex, internal. Note double areolae. Prominent helictoglossa, arrow (see enlarged inset) marks apical pore. 24.Developing valve, tegumental layer not yet deposited. Specimen from California, USA, examined in Sterrenburg et al. (2005). Note non-loculate valve structure and hollow columns (black arrow at centre). Scale bars = 5 μm (Fig. 22), 2 μm (Figs 20, 21, 23), 1 μm (Fig. 24)." figureDoi="http://doi.org/10.5281/zenodo.13637309" httpUri="https://zenodo.org/record/13637309/files/figure.png" pageId="6" pageNumber="279">Fig. 24</figureCitation>
|
||
). There are no septa dividing the valve interior into compartments (
|
||
<figureCitation id="9F9ADBB47C12FFD1FD405675FD16FE8C" box="[559,642,340,365]" captionStart="FIGURES 20−24" captionStartId="5.[136,243,1603,1624]" captionTargetBox="[151,1436,457,1577]" captionTargetId="figure-124@5.[151,1436,457,1577]" captionTargetPageId="5" captionText="FIGURES 20−24. Pleurosigma acus, epitype material except for Fig. 24, SEM. 20. Valve centre, external. Valve morphogenesis not yet finished, tegumental layer in process of formation. Note absence of septa (arrow). Central raphe fissures almost overlap. 21. Valve apex, external. Left arrow marks apical pore, right arrow marks accessory fissure terminating within raphe “hook”. 22. Valve centre, internal. Note double areolar openings (see enlarged inset) and elevated central raphe nodule. 23. Valve apex, internal. Note double areolae. Prominent helictoglossa, arrow (see enlarged inset) marks apical pore. 24.Developing valve, tegumental layer not yet deposited. Specimen from California, USA, examined in Sterrenburg et al. (2005). Note non-loculate valve structure and hollow columns (black arrow at centre). Scale bars = 5 μm (Fig. 22), 2 μm (Figs 20, 21, 23), 1 μm (Fig. 24)." figureDoi="http://doi.org/10.5281/zenodo.13637309" httpUri="https://zenodo.org/record/13637309/files/figure.png" pageId="6" pageNumber="279">Fig. 20</figureCitation>
|
||
, arrow, and
|
||
<figureCitation id="9F9ADBB47C12FFD1FC655675FCCAFE8C" box="[778,862,340,365]" captionStart="FIGURES 20−24" captionStartId="5.[136,243,1603,1624]" captionTargetBox="[151,1436,457,1577]" captionTargetId="figure-124@5.[151,1436,457,1577]" captionTargetPageId="5" captionText="FIGURES 20−24. Pleurosigma acus, epitype material except for Fig. 24, SEM. 20. Valve centre, external. Valve morphogenesis not yet finished, tegumental layer in process of formation. Note absence of septa (arrow). Central raphe fissures almost overlap. 21. Valve apex, external. Left arrow marks apical pore, right arrow marks accessory fissure terminating within raphe “hook”. 22. Valve centre, internal. Note double areolar openings (see enlarged inset) and elevated central raphe nodule. 23. Valve apex, internal. Note double areolae. Prominent helictoglossa, arrow (see enlarged inset) marks apical pore. 24.Developing valve, tegumental layer not yet deposited. Specimen from California, USA, examined in Sterrenburg et al. (2005). Note non-loculate valve structure and hollow columns (black arrow at centre). Scale bars = 5 μm (Fig. 22), 2 μm (Figs 20, 21, 23), 1 μm (Fig. 24)." figureDoi="http://doi.org/10.5281/zenodo.13637309" httpUri="https://zenodo.org/record/13637309/files/figure.png" pageId="6" pageNumber="279">Fig. 24</figureCitation>
|
||
).
|
||
</paragraph>
|
||
<paragraph id="071EC7317C12FFD1FFD25659FE7BFE70" blockId="6.[136,1452,160,653]" box="[189,495,376,401]" pageId="6" pageNumber="279">
|
||
<emphasis id="35D51B237C12FFD1FFD25659FEAAFE70" bold="true" box="[189,318,376,401]" pageId="6" pageNumber="279">Habitat:—</emphasis>
|
||
Littoral marine.
|
||
</paragraph>
|
||
</subSubSection>
|
||
<subSubSection id="4FBB94BA7C12FFD1FFD256BDFED0FD6C" pageId="6" pageNumber="279" type="distribution">
|
||
<paragraph id="071EC7317C12FFD1FFD256BDFE5AFE38" blockId="6.[136,1452,160,653]" pageId="6" pageNumber="279">
|
||
<emphasis id="35D51B237C12FFD1FFD256BDFEE1FE54" bold="true" box="[189,373,412,437]" pageId="6" pageNumber="279">Distribution:—</emphasis>
|
||
<typeStatus id="D81A79937C12FFD1FE1A56BDFE39FE54" box="[373,429,412,437]" pageId="6" pageNumber="279">Type</typeStatus>
|
||
material from
|
||
<collectingCountry id="7FB687A17C12FFD1FD3956BDFD43FE54" box="[598,727,412,437]" name="Philippines" pageId="6" pageNumber="279">Philippines</collectingCountry>
|
||
, for additional personal observations of specimens matching the
|
||
<typeStatus id="D81A79937C12FFD1FFE756E1FF2FFE38" box="[136,187,448,473]" pageId="6" pageNumber="279">type</typeStatus>
|
||
, see under
|
||
<taxonomicName id="C0A1BCB27C12FFD1FE5756E1FE53FE38" authorityName="Cleve" authorityYear="1880" box="[312,455,448,473]" class="Bacillariophyceae" family="Pleurosigmataceae" genus="Pleurosigma" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="6" pageNumber="279" phylum="Bacillariophyta" rank="species" species="subrectum">
|
||
<emphasis id="35D51B237C12FFD1FE5756E1FE53FE38" box="[312,455,448,473]" italics="true" pageId="6" pageNumber="279">P. subrectum</emphasis>
|
||
</taxonomicName>
|
||
.
|
||
</paragraph>
|
||
<paragraph id="071EC7317C12FFD1FFD256C5FED0FD6C" blockId="6.[136,1452,160,653]" pageId="6" pageNumber="279">
|
||
<emphasis id="35D51B237C12FFD1FFD256C5FE15FE1C" bold="true" box="[189,385,484,509]" pageId="6" pageNumber="279">Observations:—</emphasis>
|
||
<figureCitation id="9F9ADBB47C12FFD1FEEE56C5FE48FE1C" box="[385,476,484,509]" captionStart="FIGURES 12−19" captionStartId="4.[136,243,1983,2004]" captionTargetBox="[170,1416,389,1958]" captionTargetId="figure-85@4.[170,1416,389,1958]" captionTargetPageId="4" captionText="FIGURES 12−19. Pleurosigma acus, LM. 12−14, 18. Lectotype. 15−17, 19. Epitype specimen. All BF. 18, 19. Greatly enlarged detail of lectotype (Fig. 18) and epitype (Fig. 19) striation to facilitate verification of identical stria density and stria angle. Scale bars = 20 μm (Figs. 12−15), 5 μm (Figs. 16−19)." figureDoi="http://doi.org/10.5281/zenodo.13637307" httpUri="https://zenodo.org/record/13637307/files/figure.png" pageId="6" pageNumber="279">Figs. 18</figureCitation>
|
||
(
|
||
<typeStatus id="D81A79937C12FFD1FE8456C5FDC0FE1C" box="[491,596,484,509]" pageId="6" pageNumber="279" type="lectotype">lectotype</typeStatus>
|
||
specimen) and 19 (
|
||
<typeStatus id="D81A79937C12FFD1FC5F56C5FC10FE1C" box="[816,900,484,509]" pageId="6" pageNumber="279" type="epitype">epitype</typeStatus>
|
||
specimen) illustrate the perfect match as regards striation: identical stria densities and stria angles (
|
||
<emphasis id="35D51B237C12FFD1FDAE5529FD77FDC0" box="[705,739,520,545]" italics="true" pageId="6" pageNumber="279">ca.</emphasis>
|
||
68°). From the descriptions of these two taxa it becomes clear that no morphological differences can be demonstrated for
|
||
<taxonomicName id="C0A1BCB27C12FFD1FC72550DFC38FDA4" authorityName="Cleve" authorityYear="1880" box="[797,940,556,581]" class="Bacillariophyceae" family="Pleurosigmataceae" genus="Pleurosigma" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="6" pageNumber="279" phylum="Bacillariophyta" rank="species" species="subrectum">
|
||
<emphasis id="35D51B237C12FFD1FC72550DFC38FDA4" box="[797,940,556,581]" italics="true" pageId="6" pageNumber="279">P. subrectum</emphasis>
|
||
</taxonomicName>
|
||
and
|
||
<taxonomicName id="C0A1BCB27C12FFD1FC8D550DFBA4FDA4" box="[994,1072,556,581]" class="Bacillariophyceae" family="Pleurosigmataceae" genus="Pleurosigma" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="6" pageNumber="279" phylum="Bacillariophyta" rank="species" species="acus">
|
||
<emphasis id="35D51B237C12FFD1FC8D550DFBA4FDA4" box="[994,1072,556,581]" italics="true" pageId="6" pageNumber="279">P. acus</emphasis>
|
||
</taxonomicName>
|
||
, including such fine details as the accessory apical fissures and the hollow columns shoring the two layers of the sandwich-structured valves (compare
|
||
<figureCitation id="9F9ADBB47C12FFD1FFE75555FF75FD6C" box="[136,225,628,653]" captionStart="FIGURES 7−11" captionStartId="3.[136,243,1882,1903]" captionTargetBox="[151,1436,533,1857]" captionTargetId="figure-191@3.[151,1436,533,1857]" captionTargetPageId="3" captionText="FIGURES 7−11. Pleurosigma subrectum, type material, SEM. Fig. 7. Valve centre, external. Central raphe fissures almost overlap. Fig. 8. Valve apex, external. Top arrow marks apical pore, bottom arrow marks accessory fissure terminating within raphe “hook”. Fig. 9. Valve centre, internal. Note double areolar openings (see enlarged inset) and elevated central raphe nodule. Fig. 10. Valve apex, internal. Prominent helictoglossa, arrow marks apical pore (see enlarged inset). Fig. 11. Broken valve shows hollow columns (white arrow) with additional minute cavities (black arrows). Scale bars = 10 μm (Figs 7, 9), 5 μm (Figs 8, 10), 1 μm (Fig. 11)." figureDoi="http://doi.org/10.5281/zenodo.13637305" httpUri="https://zenodo.org/record/13637305/files/figure.png" pageId="6" pageNumber="279">Figs. 11</figureCitation>
|
||
and
|
||
<figureCitation id="9F9ADBB47C12FFD1FE775555FEACFD6C" box="[280,312,628,653]" captionStart="FIGURES 20−24" captionStartId="5.[136,243,1603,1624]" captionTargetBox="[151,1436,457,1577]" captionTargetId="figure-124@5.[151,1436,457,1577]" captionTargetPageId="5" captionText="FIGURES 20−24. Pleurosigma acus, epitype material except for Fig. 24, SEM. 20. Valve centre, external. Valve morphogenesis not yet finished, tegumental layer in process of formation. Note absence of septa (arrow). Central raphe fissures almost overlap. 21. Valve apex, external. Left arrow marks apical pore, right arrow marks accessory fissure terminating within raphe “hook”. 22. Valve centre, internal. Note double areolar openings (see enlarged inset) and elevated central raphe nodule. 23. Valve apex, internal. Note double areolae. Prominent helictoglossa, arrow (see enlarged inset) marks apical pore. 24.Developing valve, tegumental layer not yet deposited. Specimen from California, USA, examined in Sterrenburg et al. (2005). Note non-loculate valve structure and hollow columns (black arrow at centre). Scale bars = 5 μm (Fig. 22), 2 μm (Figs 20, 21, 23), 1 μm (Fig. 24)." figureDoi="http://doi.org/10.5281/zenodo.13637309" httpUri="https://zenodo.org/record/13637309/files/figure.png" pageId="6" pageNumber="279">24</figureCitation>
|
||
).
|
||
</paragraph>
|
||
</subSubSection>
|
||
</treatment>
|
||
</document> |