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<document id="E80DA15EEA947EE1E76BB6893030F394" ID-CLB-Dataset="282068" ID-DOI="10.5252/cryptogamie-algologie2023v44a9" ID-GBIF-Dataset="c0e3e7b0-a59b-4904-a218-81be939fad89" ID-ISSN="1776-0984" ID-Zenodo-Dep="10376356" IM.bibliography_approvedBy="jonas" IM.illustrations_approvedBy="jonas" IM.materialsCitations_approvedBy="jonas" IM.metadata_approvedBy="jonas" IM.tables_approvedBy="jonas" IM.taxonomicNames_approvedBy="jonas" IM.treatmentCitations_approvedBy="jonas" IM.treatments_approvedBy="jonas" checkinTime="1702549297090" checkinUser="plazi" docAuthor="Alibert, Marie, Hamilton, Paul B., Pienitz, Reinhard &amp; Antoniades, Dermot" docDate="2023" docId="AB6887832B28FFF8FC3CFA27FDC34F75" docLanguage="en" docName="algologie.2023.44.9.pdf" docOrigin="Cryptogamie, Algologie 20 (9)" docSource="https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/algologie2023v44a9.pdf" docStyle="DocumentStyle:C31C23F805CBAD2BB1C6021F66949308.6:CryptogamieAlgologie.2019-.journal_article" docStyleId="C31C23F805CBAD2BB1C6021F66949308" docStyleName="CryptogamieAlgologie.2019-.journal_article" docStyleVersion="6" docTitle="Kobayasiella parasubtilissima Lange-Bertalot 1999" docType="treatment" docVersion="3" lastPageNumber="161" masterDocId="5751FFFB2B2DFFFFFFF2FF95FFB64879" masterDocTitle="Small naviculoid species of Kobayasiella Lange-Bertalot, Adlafia Moser, Lange-Bertalot &amp; Metzeltin, Nupela Vyverman &amp; Compère and Sellaphora Mereschowsky from Tursujuq National Park, Hudson Bay region, Nunavik, Québec" masterLastPageNumber="187" masterPageNumber="157" pageNumber="160" updateTime="1702670739256" updateUser="ExternalLinkService" zenodo-license-document="CC0-1.0" zenodo-license-figures="CC0-1.0" zenodo-license-treatments="UNSPECIFIED">
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<mods:title id="BA73D47593EA1521FDBEDA40F508E11A">Small naviculoid species of Kobayasiella Lange-Bertalot, Adlafia Moser, Lange-Bertalot &amp; Metzeltin, Nupela Vyverman &amp; Compère and Sellaphora Mereschowsky from Tursujuq National Park, Hudson Bay region, Nunavik, Québec</mods:title>
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<mods:namePart id="21DB21B30AC676DB5696FAB0FFF0B265">Alibert, Marie</mods:namePart>
<mods:affiliation id="B34D978649153D0359200379488D48B7">Université Laval, Département de Géographie et Centre d’études nordiques (CEN), Pavillon Abitibi-Price, 2405 rue de la Terrasse, Québec G 1 V 0 A 6 (Canada)</mods:affiliation>
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<mods:namePart id="FC7F34A2671A248B5CB3C1D62389966F">Hamilton, Paul B.</mods:namePart>
<mods:affiliation id="D88CFCA344AF57F624B34F99038D4A53">Canadian Museum of Nature, Research and Collections Division, PO Box 3443, Station D, Ottawa, ON, K 1 P 6 P 4 (Canada)</mods:affiliation>
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<mods:namePart id="2E5EDBC7CABE9641417A8518F158B755">Pienitz, Reinhard</mods:namePart>
<mods:affiliation id="986FD4BF1A5C32DBD206DEDF4FC0C83C">Université Laval, Département de Géographie et Centre d’études nordiques (CEN), Pavillon Abitibi-Price, 2405 rue de la Terrasse, Québec G 1 V 0 A 6 (Canada)</mods:affiliation>
<mods:nameIdentifier id="CF3DBBDB6C610976B7B498614DF4D610" type="email">reinhard.pienitz@cen.ulaval.ca</mods:nameIdentifier>
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<mods:namePart id="B1A1F8A9AA02168275A9642EB15FC9C2">Antoniades, Dermot</mods:namePart>
<mods:affiliation id="29CA09EC994BD8AA005D264DA8BF69C4">Université Laval, Département de Géographie et Centre d’études nordiques (CEN), Pavillon Abitibi-Price, 2405 rue de la Terrasse, Québec G 1 V 0 A 6 (Canada)</mods:affiliation>
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<mods:title id="7684173BA066526F646D63178C5CDAE5">Cryptogamie, Algologie</mods:title>
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<mods:date id="D0125F0F16041F64088A7AC14929C79C">2023</mods:date>
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<subSubSection id="6BDB651E2B28FFFAFC3CFA27FA8B4D94" pageId="5" pageNumber="160" type="nomenclature">
<paragraph id="237E36952B28FFFAFC3CFA27FA8B4D94" blockId="5.[926,1341,1458,1517]" pageId="5" pageNumber="160">
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<taxonomicName id="E4C14D162B28FFFAFC3CFA27FA8B4D94" authority="(Kobayasi &amp; Nagumo) Lange-Bertalot" authorityName="Lange-Bertalot" authorityYear="1999" baseAuthorityName="Kobayasi &amp; Nagumo" class="Bacillariophyceae" family="Naviculaceae" genus="Kobayasiella" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="5" pageNumber="160" phylum="Ochrophyta" rank="species" species="parasubtilissima">
<emphasis id="11B5EA872B28FFFAFC3CFA27FAB84DB4" bold="true" box="[974,1294,1458,1485]" italics="true" pageId="5" pageNumber="160">Kobayasiella parasubtilissima</emphasis>
(Kobayasi &amp; Nagumo) Lange-Bertalot
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<subSubSection id="6BDB651E2B28FFFAFBFBFA66FB644E74" box="[1033,1234,1523,1549]" pageId="5" pageNumber="160" type="description">
<paragraph id="237E36952B28FFFAFBFBFA66FB644E74" blockId="5.[1033,1234,1523,1549]" box="[1033,1234,1523,1549]" pageId="5" pageNumber="160">
<heading id="783681F92B28FFFAFBFBFA66FB644E74" box="[1033,1234,1523,1549]" centered="true" fontSize="11" level="3" pageId="5" pageNumber="160" reason="3">
(
<figureCitation id="BBFA2A102B28FFFAFBE0FA66FBE54E74" box="[1042,1107,1523,1549]" captionStart="FIG" captionStartId="7.[132,143,1596,1614]" captionTargetBox="[132,1455,199,1582]" captionTargetId="figure-162@7.[698,1267,805,1366]" captionTargetPageId="7" captionText="FIG. 2. — Light micrograph diminution series of Kobayasiella Lange-Bertalot species: A-P, Kobayasiella parasubtilissima (Kobayasi &amp; Nagumo) Lange-Bertalot; Q-AB, Kobayasiella madumensis (Jørgensen) Lange-Bertalot; AC-AO, Kobayasiella subtilissima (Cleve) Lange-Bertalot. Scale bar: 10 µm." figureDoi="http://doi.org/10.5281/zenodo.10376360" httpUri="https://zenodo.org/record/10376360/files/figure.png" pageId="5" pageNumber="160">Figs 2</figureCitation>
A-P;
<figureCitation id="BBFA2A102B28FFFAFB79FA66FB2F4E74" box="[1163,1177,1523,1549]" captionStart-0="FIG" captionStart-1="APPENDIX" captionStartId-0="9.[132,143,1581,1599]" captionStartId-1="31.[489,501,1081,1099]" captionTargetBox-0="[132,1455,215,1536]" captionTargetBox-1="[132,1456,261,1043]" captionTargetId-0="figure-190@9.[698,1267,780,1348]" captionTargetId-1="figure-37@31.[699,1268,286,844]" captionTargetPageId-0="9" captionTargetPageId-1="31" captionText-0="FIG. 4. — SEM images of Kobayasiella parasubtilissima (Kobayasi &amp; Nagumo) Lange-Bertalot:A, external view of the complete valve; B, internal view of the valve areolae recessed between virgae;C, section of girdle band showing one row of evident pore and a second row of scattered less evident pores with volae covers; D, external view of the axial and central areas showing the multiseriate poroid covers between the virgae; E, internal view of the central area showing T-shaped proximal fissures; F, central area with a weak central depression; G, external view of the valve apex, showing a partially curved proximal fissure opening into a small round surface depression; H, internal valve view of the apex. Helictoglossa expanded onto a highline apex. Areolae continuous around the apex. Scale bars: A, 10 µm; B-E, H, 1 µm; F, 600 nm; G, 3 µm." captionText-1="APPENDIX 4. — Relative abundance of species as a function of DIC values." figureDoi-0="http://doi.org/10.5281/zenodo.10376364" figureDoi-1="http://doi.org/10.5281/zenodo.10376392" httpUri-0="https://zenodo.org/record/10376364/files/figure.png" httpUri-1="https://zenodo.org/record/10376392/files/figure.png" pageId="5" pageNumber="160">4</figureCitation>
A-H)
</heading>
</paragraph>
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<subSubSection id="6BDB651E2B28FFFAFCB1F9B8FA2E4E03" pageId="5" pageNumber="160" type="reference_group">
<paragraph id="237E36952B28FFFAFCB1F9B8FA2E4E03" blockId="5.[814,1457,1581,1659]" pageId="5" pageNumber="160">
<emphasis id="11B5EA872B28FFFAFCB1F9B8FBE44E3C" box="[835,1106,1581,1605]" italics="true" pageId="5" pageNumber="160">Iconographia Diatomologica</emphasis>
6: 268 (
<bibRefCitation id="47504B642B28FFFAFB5CF9B8FA364E3C" author="Lange-Bertalot" box="[1198,1408,1581,1605]" firstAuthor="Lange-Bertalot" pageId="5" pageNumber="160" pagination="1 - 271" refId="ref17496" refString="LANGE-BERTALOT H. &amp; GENKAL S. I. 1999. - Diatoms from Siberia I, Islands in the Arctic Ocean (Yugorsky-Shar Strait). Iconographia Diatomologica 6: 1 - 271." type="journal article" year="1999">Lange-Bertalot 1999</bibRefCitation>
). —
<treatmentCitationGroup id="03D111BB2B28FFFAFCDCF9DDFA2E4E03" pageId="5" pageNumber="160">
<taxonomicName id="E4C14D162B28FFFAFCDCF9DDFAAF4E19" authority="Kobayasi &amp; Nagumo" authorityName="Kobayasi &amp; Nagumo" box="[814,1305,1608,1632]" class="Bacillariophyceae" family="Naviculaceae" genus="Navicula" kingdom="Chromista" order="Naviculales" pageId="5" pageNumber="160" phylum="Ochrophyta" rank="species" species="parasubtilissima">
<emphasis id="11B5EA872B28FFFAFCDCF9DDFB874E19" box="[814,1073,1608,1632]" italics="true" pageId="5" pageNumber="160">Navicula parasubtilissima</emphasis>
Kobayasi &amp; Nagumo
</taxonomicName>
,
<treatmentCitation id="A26010842B28FFFAFAD5F9DDFA244E03" author="Kobayasi &amp; Nagumo" page="245" pageId="5" pageNumber="160" year="1988">
<emphasis id="11B5EA872B28FFFAFAD5F9DDFC7B4E03" italics="true" pageId="5" pageNumber="160">
The Botanical Magazine,
<collectingRegion id="E105F8772B28FFFAFC65F9F7FC7B4E03" box="[919,973,1634,1658]" country="Japan" name="Tokyo" pageId="5" pageNumber="160">Tokyo</collectingRegion>
</emphasis>
101 (1063): 245 (
<bibRefCitation id="47504B642B28FFFAFB70F9F7FA3D4E03" author="Kobayasi &amp; Nagumo" box="[1154,1419,1634,1659]" firstAuthor="Kobayasi" pageId="5" pageNumber="160" pagination="239 - 253" refId="ref17117" refString="KOBAYASI H. &amp; NAGUMO T. 1988. - Examination of the type materials of Navicula subtilissima Cleve (Bacillariophyceae). The Botanical Magazine, Tokyo 101 (3): 239 - 253. https: // doi. org / 10.1007 / BF 02488602" type="journal article" year="1988">Kobayasi &amp; Nagumo 1988</bibRefCitation>
)
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.
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</paragraph>
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<subSubSection id="6BDB651E2B28FFFAFCDFF901FC584F90" pageId="5" pageNumber="160" type="biology_ecology">
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<smallCapsWord id="2598A0492B28FFFAFC62F90CFC0C4ED3" baselines="1702" box="[912,954,1689,1706]" lowerCaseFontSize="7" mainFontSize="10" normCase="lower" normString="and" pageId="5" pageNumber="160">AND</smallCapsWord>
<smallCapsWord id="2598A0492B28FFFAFC4DF90CFBFF4ED3" baselines="1702" box="[959,1097,1689,1706]" lowerCaseFontSize="7" mainFontSize="10" normCase="lower" normString="distribution" pageId="5" pageNumber="160">DISTRIBUTION</smallCapsWord>
. —
<taxonomicName id="E4C14D162B28FFFAFB80F906FA304ED2" authorityName="Lange-Bertalot" authorityYear="1999" baseAuthorityName="Kobayasi &amp; Nagumo" box="[1138,1414,1683,1707]" class="Bacillariophyceae" family="Naviculaceae" genus="Kobayasiella" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="5" pageNumber="160" phylum="Ochrophyta" rank="species" species="parasubtilissima">
<emphasis id="11B5EA872B28FFFAFB80F906FA304ED2" box="[1138,1414,1683,1707]" italics="true" pageId="5" pageNumber="160">Kobayasiella parasubtilissima</emphasis>
</taxonomicName>
was found in ten lakes. A rare species, with a mean relative abundance of 0.2% and a maximum of 5.5% in Lake 16-H. Although rare, this species was more abundant in acidic conditions (
<figureCitation id="BBFA2A102B28FFFAFAC6F976FA114E82" box="[1332,1447,1763,1787]" captionStart="APPENDIX" captionStartId="31.[492,504,219,237]" captionTargetId="figure-37@31.[699,1268,286,844]" captionTargetPageId="31" captionText="APPENDIX 3. — Relative abundance of species as a function of pH values." figureDoi="http://doi.org/10.5281/zenodo.10392975" httpUri="https://zenodo.org/record/10392975/files/figure.png" pageId="5" pageNumber="160">Appendix 3</figureCitation>
) with a pH optimum of 5.7 and a relatively high DOC optimum of
<quantity id="E4399B702B28FFFAFCBBF88DFC244F49" box="[841,914,1816,1840]" metricMagnitude="-6" metricUnit="kg" metricValue="6.9" pageId="5" pageNumber="160" unit="mg" value="6.9">6.9 mg</quantity>
/L (
<figureCitation id="BBFA2A102B28FFFAFC49F88DFB854F49" box="[955,1075,1816,1840]" captionStart="APPENDIX" captionStartId="30.[448,460,1210,1228]" captionTargetBox="[132,1456,335,1107]" captionTargetId="figure-20@30.[698,1267,364,923]" captionTargetPageId="30" captionText="APPENDIX 2. — Relative abundance of species as a function of DOC concentrations." figureDoi="http://doi.org/10.5281/zenodo.10376390" httpUri="https://zenodo.org/record/10376390/files/figure.png" pageId="5" pageNumber="160">Appendix 2</figureCitation>
).
<bibRefCitation id="47504B642B28FFFAFBB9F88DFAD84F49" author="Camburn &amp; Charles" box="[1099,1390,1816,1840]" firstAuthor="Camburn" pageId="5" pageNumber="160" refId="ref16423" refString="CAMBURN K. E. &amp; CHARLES D. F. 2000. - Diatoms of low-alkalinity lakes in the Northeastern United States. Academy of Natural Sciences, Philadelphia, 152 p." type="book" year="2000">Camburn &amp; Charles (2000)</bibRefCitation>
,
<bibRefCitation id="47504B642B28FFFAFA8FF88DFC194F33" author="Fallu" etAl="et al." firstAuthor="Fallu" pageId="5" pageNumber="160" pagination="1 - 200" refId="ref16593" refString="FALLU M. - A., ALLAIRE N. &amp; PIENITZ R. 2000. - Freshwater diatoms from northern Quebec and Labrador (Canada): speciesenvironment relationships in lakes of boreal forest, forest-tundra and tundra regions. Bibliotheca Diatomologica 45: 1 - 200." type="journal article" year="2000">
Fallu
<emphasis id="11B5EA872B28FFFAFCDFF8A6FCEE4F33" box="[813,856,1842,1866]" italics="true" pageId="5" pageNumber="160">et al</emphasis>
. (2000)
</bibRefCitation>
, and
<bibRefCitation id="47504B642B28FFFAFC1DF8A7FB484F33" author="Siver &amp; Hamilton" box="[1007,1278,1842,1866]" firstAuthor="Siver" pageId="5" pageNumber="160" pagination="1 - 916" refId="ref18713" refString="SIVER P. A. &amp; HAMILTON P. B. 2011. - Diatoms of North America: the freshwater flora of waterbodies on the Atlantic coastal plain. Iconographia Diatomologica 22: 1 - 916." type="journal article" year="2011">Siver &amp; Hamilton (2011)</bibRefCitation>
all reported this taxon from low alkalinity, low pH waters across eastern North America.
<bibRefCitation id="47504B642B28FFFAFC60F8F2FBF94F06" author="SIVER P. A. &amp; HAMILTON P. B." box="[914,1103,1895,1919]" journalOrPublisher="Canadian Journal of Botany" pageId="5" pageNumber="160" pagination="362 - 378" part="83" refId="ref18656" refString="SIVER P. A. &amp; HAMILTON P. B. 2005. - Observations on new and rare species of freshwater diatoms from Cape Cod, Massachusetts, USA. Canadian Journal of Botany 83 (4): 362 - 378. https: // doi. org / 10.1139 / b 05 - 010" title="Observations on new and rare species of freshwater diatoms from Cape Cod, Massachusetts, USA" type="journal article" year="2005">
Siver
<emphasis id="11B5EA872B28FFFAFC3FF8FDFC4F4F06" box="[973,1017,1895,1919]" italics="true" pageId="5" pageNumber="160">et al</emphasis>
. (2005)
</bibRefCitation>
and
<bibRefCitation id="47504B642B28FFFAFB7AF8F2FAAD4F06" author="Bahls" box="[1160,1307,1895,1919]" firstAuthor="Bahls" pageId="5" pageNumber="160" refId="ref16163" refString="BAHLS L. 2012 b. - Kobayasiella parasubtilissima. Available from https: // diatoms. org / species / kobayasiella _ parasubtilissima (accessed 26 March 2022)." type="url" year="2012" yearSuffix="b">Bahls (2012b)</bibRefCitation>
also observed this taxon with a mixed population of more than one species from western North America.
<taxonomicName id="E4C14D162B28FFFAFB9BF809FA3E4FCD" authorityName="Lange-Bertalot" authorityYear="1999" baseAuthorityName="Kobayasi &amp; Nagumo" box="[1129,1416,1948,1972]" class="Bacillariophyceae" family="Naviculaceae" genus="Kobayasiella" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="5" pageNumber="160" phylum="Ochrophyta" rank="species" species="parasubtilissima">
<emphasis id="11B5EA872B28FFFAFB9BF809FA3E4FCD" box="[1129,1416,1948,1972]" italics="true" pageId="5" pageNumber="160">Kobayasiella parasubtilissima</emphasis>
</taxonomicName>
has also been reported from Europe, suggesting that this is a globally distributed species.
</paragraph>
</subSubSection>
<caption id="77BE661D2B2BFFF9FF76FB46FF664C82" ID-DOI="http://doi.org/10.5281/zenodo.10376358" ID-Zenodo-Dep="10376358" httpUri="https://zenodo.org/record/10376358/files/figure.png" pageId="6" pageNumber="161" startId="6.[132,143,1235,1253]" targetBox="[163,1432,206,1197]" targetPageId="6" targetType="figure">
<paragraph id="237E36952B2BFFF9FF76FB46FF664C82" blockId="6.[132,1455,1234,1275]" pageId="6" pageNumber="161">
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. 1. — Lake sampling locations and surface deposits in Tursujuq National Park.
<emphasis id="11B5EA872B2BFFF9FCDFFB46FCD64C9C" bold="true" box="[813,864,1235,1253]" pageId="6" pageNumber="161">Insert</emphasis>
shows the position of Tursujuq Park in Nunavik, Québec,eastern North America.
</paragraph>
</caption>
<subSubSection id="6BDB651E2B2BFFF8FF76FAA1FDC34F75" lastPageId="7" lastPageNumber="162" pageId="6" pageNumber="161" type="description">
<paragraph id="237E36952B2BFFF9FF76FAA1FEA34D35" blockId="6.[132,277,1332,1358]" box="[132,277,1332,1358]" pageId="6" pageNumber="161">
<heading id="783681F92B2BFFF9FF76FAA1FEA34D35" box="[132,277,1332,1358]" fontSize="9" level="3" pageId="6" pageNumber="161" reason="5">
<smallCapsWord id="2598A0492B2BFFF9FF76FAA1FEA34D35" baselines="1351,1351" box="[132,277,1332,1358]" lowerCaseFontSize="8" mainFontSize="11" normCase="title" normString="Description" pageId="6" pageNumber="161">DESCRIPTION</smallCapsWord>
</heading>
</paragraph>
<paragraph id="237E36952B2BFFF9FF76FAC6FAAB4F55" blockId="6.[131,777,1363,2028]" lastBlockId="6.[811,1457,1331,2028]" pageId="6" pageNumber="161">
The frustules exhibit a rectangular and narrow shape in girdle view. The valves are narrow, ranging from linear to linear-lanceolate, with capitate ends. Based on a sample size of 21, the valve dimensions vary, with a length ranging from 27 to 33.5 µm and a width ranging from 3.5 to 5 µm. The length-to-width ratio is 6.5 to 7.0. The stria density ranges from
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10 µm. The axial area is linear to lanceolate and narrow. The central area is weakly linear-elliptic, exhibiting 7-8 marginal striae of varying lengths. The valve face is flat. The raphe is linear, with a distinct kink-like irregularity occurring halfway between the mid-valve and apex (
<figureCitation id="BBFA2A102B2BFFF9FD8AF907FD7A4ED5" box="[632,716,1682,1708]" captionStart="FIG" captionStartId="9.[132,143,1581,1599]" captionTargetBox="[132,1455,215,1536]" captionTargetId="figure-190@9.[698,1267,780,1348]" captionTargetPageId="9" captionText="FIG. 4. — SEM images of Kobayasiella parasubtilissima (Kobayasi &amp; Nagumo) Lange-Bertalot:A, external view of the complete valve; B, internal view of the valve areolae recessed between virgae;C, section of girdle band showing one row of evident pore and a second row of scattered less evident pores with volae covers; D, external view of the axial and central areas showing the multiseriate poroid covers between the virgae; E, internal view of the central area showing T-shaped proximal fissures; F, central area with a weak central depression; G, external view of the valve apex, showing a partially curved proximal fissure opening into a small round surface depression; H, internal valve view of the apex. Helictoglossa expanded onto a highline apex. Areolae continuous around the apex. Scale bars: A, 10 µm; B-E, H, 1 µm; F, 600 nm; G, 3 µm." figureDoi="http://doi.org/10.5281/zenodo.10376364" httpUri="https://zenodo.org/record/10376364/files/figure.png" pageId="6" pageNumber="161">Fig. 4A</figureCitation>
). The central raphe fissures are widely spaced, linearly expanded, and rounded. The terminal raphe fissures are weakly curved on the valve face, opening with an external linear to funnel-like groove (
<figureCitation id="BBFA2A102B2BFFF9FEF8F887FE364F55" box="[266,384,1810,1836]" captionStart="FIG" captionStartId="9.[132,143,1581,1599]" captionTargetBox="[132,1455,215,1536]" captionTargetId="figure-190@9.[698,1267,780,1348]" captionTargetPageId="9" captionText="FIG. 4. — SEM images of Kobayasiella parasubtilissima (Kobayasi &amp; Nagumo) Lange-Bertalot:A, external view of the complete valve; B, internal view of the valve areolae recessed between virgae;C, section of girdle band showing one row of evident pore and a second row of scattered less evident pores with volae covers; D, external view of the axial and central areas showing the multiseriate poroid covers between the virgae; E, internal view of the central area showing T-shaped proximal fissures; F, central area with a weak central depression; G, external view of the valve apex, showing a partially curved proximal fissure opening into a small round surface depression; H, internal valve view of the apex. Helictoglossa expanded onto a highline apex. Areolae continuous around the apex. Scale bars: A, 10 µm; B-E, H, 1 µm; F, 600 nm; G, 3 µm." figureDoi="http://doi.org/10.5281/zenodo.10376364" httpUri="https://zenodo.org/record/10376364/files/figure.png" pageId="6" pageNumber="161">Fig. 4A, G</figureCitation>
). Internally, the raphe is situated on a thickened sternum, appearing straight without a kink-like regularity. The proximal raphe fissures are T-shaped depressions, while the terminal fissures end on elongated helictoglossae, isolated from the apex mantle (
<figureCitation id="BBFA2A102B2BFFF9FE0CF804FD3D4FD2" box="[510,651,1937,1964]" captionStart="FIG" captionStartId="9.[132,143,1581,1599]" captionTargetBox="[132,1455,215,1536]" captionTargetId="figure-190@9.[698,1267,780,1348]" captionTargetPageId="9" captionText="FIG. 4. — SEM images of Kobayasiella parasubtilissima (Kobayasi &amp; Nagumo) Lange-Bertalot:A, external view of the complete valve; B, internal view of the valve areolae recessed between virgae;C, section of girdle band showing one row of evident pore and a second row of scattered less evident pores with volae covers; D, external view of the axial and central areas showing the multiseriate poroid covers between the virgae; E, internal view of the central area showing T-shaped proximal fissures; F, central area with a weak central depression; G, external view of the valve apex, showing a partially curved proximal fissure opening into a small round surface depression; H, internal valve view of the apex. Helictoglossa expanded onto a highline apex. Areolae continuous around the apex. Scale bars: A, 10 µm; B-E, H, 1 µm; F, 600 nm; G, 3 µm." figureDoi="http://doi.org/10.5281/zenodo.10376364" httpUri="https://zenodo.org/record/10376364/files/figure.png" pageId="6" pageNumber="161">Fig. 4F, E, H</figureCitation>
). The striae exhibit a radial pattern at the mid-valve and become strongly convergent towards the apices (
<figureCitation id="BBFA2A102B2BFFF9FE23F844FD944F92" box="[465,546,2001,2027]" captionStart="FIG" captionStartId="9.[132,143,1581,1599]" captionTargetBox="[132,1455,215,1536]" captionTargetId="figure-190@9.[698,1267,780,1348]" captionTargetPageId="9" captionText="FIG. 4. — SEM images of Kobayasiella parasubtilissima (Kobayasi &amp; Nagumo) Lange-Bertalot:A, external view of the complete valve; B, internal view of the valve areolae recessed between virgae;C, section of girdle band showing one row of evident pore and a second row of scattered less evident pores with volae covers; D, external view of the axial and central areas showing the multiseriate poroid covers between the virgae; E, internal view of the central area showing T-shaped proximal fissures; F, central area with a weak central depression; G, external view of the valve apex, showing a partially curved proximal fissure opening into a small round surface depression; H, internal valve view of the apex. Helictoglossa expanded onto a highline apex. Areolae continuous around the apex. Scale bars: A, 10 µm; B-E, H, 1 µm; F, 600 nm; G, 3 µm." figureDoi="http://doi.org/10.5281/zenodo.10376364" httpUri="https://zenodo.org/record/10376364/files/figure.png" pageId="6" pageNumber="161">Fig. 4B</figureCitation>
). From the mid-valve to the Voigt fault, the individual striae become straight to bent, while from the Voigt fault to the apex, they change from bent to straight. The striae possess 4-6 (sometimes 9) rows of pores. The striae are interrupted by a hyaline valve face/ mantle margin along the valve sides and extend uninterrupted around the apices. Distinct Voigt faults can be observed on both the primary and secondary sides of the valve, located at 2/3 of the distance between the mid-valve and apex. The striae are covered with 4-6 (sometimes more) rows of small multiseriate pores. Internally, the multiseriate pores are positioned between thickened virgae. Small silica projections from the virgae may or may not be present. The cingulum features 3-4 open copulae bands, with the copulae exhibiting two linear rows of pores at the pars interior. Additionally, a velum-like cover with 6-8 openings covers the pores. Occasionally, a fringe can be observed at the base of a copula.
</paragraph>
<paragraph id="237E36952B2BFFF8FCB1F8A4FDC34F75" blockId="6.[811,1457,1331,2028]" lastBlockId="7.[130,775,1746,1804]" lastPageId="7" lastPageNumber="162" pageId="6" pageNumber="161">
Specimens from Tursujuq National Park match specimens from the original publication of
<bibRefCitation id="47504B642B2BFFF9FB8CF8C4FA1B4F15" author="Kobayasi &amp; Nagumo" box="[1150,1453,1873,1900]" firstAuthor="Kobayasi" pageId="6" pageNumber="161" pagination="239 - 253" refId="ref17117" refString="KOBAYASI H. &amp; NAGUMO T. 1988. - Examination of the type materials of Navicula subtilissima Cleve (Bacillariophyceae). The Botanical Magazine, Tokyo 101 (3): 239 - 253. https: // doi. org / 10.1007 / BF 02488602" type="journal article" year="1988">Kobayasi &amp; Nagumo (1988)</bibRefCitation>
with the characteristic linear narrow valves with capitate ends and a length to width ratio between 6.5 and 7.0. Populations in Tursujuq National Park were at the larger end of the described size range, with slightly wider valves (up to 5 µm) and a higher stria density (up to
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10 µm) when including irregular smaller striae along the valve margin.
</paragraph>
</subSubSection>
</treatment>
</document>
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