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<document id="970C851EB9AB68C575C2AD6F17D91DE6" ID-DOI="10.11646/phytotaxa.90.1.1" ID-ISSN="1179-3163" ID-Zenodo-Dep="5071976" IM.materialsCitations_approvedBy="felipe" IM.metadata_approvedBy="felipe" IM.tables_requiresApprovalFor="existingObjects,plazi" IM.taxonomicNames_approvedBy="felipe" checkinTime="1625517298981" checkinUser="felipe" docAuthor="Pavlov, Aleksandar, Levkov, Zlatko, Williams, David M. &amp; Edlund, Mark B." docDate="2013" docId="065A87E62A6BA423FF5EFB18FD2E0AD1" docLanguage="en" docName="Phytotaxa.90.1.1-53.pdf" docOrigin="Phytotaxa 90 (1)" docSource="http://dx.doi.org/10.11646/phytotaxa.90.1.1" docStyle="DocumentStyle:13F189B31CB4CCCE9197361A4E100104.3:Phytotaxa.2011-2013.journal_article" docStyleId="13F189B31CB4CCCE9197361A4E100104" docStyleName="Phytotaxa.2011-2013.journal_article" docStyleVersion="3" docTitle="Hippodonta conspicua A. Pavlov, Levkov, D. M. Williams &amp; Edlund 2013, sp. nov." docType="treatment" docVersion="4" lastPageNumber="25" masterDocId="FA63FF9E2A73A43AFFC9FF9DFF960A2E" masterDocTitle="Observations on Hippodonta (Bacillariophyceae) in selected ancient lakes" masterLastPageNumber="53" masterPageNumber="1" pageNumber="25" updateTime="1698991198074" updateUser="plazi" zenodo-license-document="CLOSED">
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<mods:title id="7B2463971F15989315A752FD8DF86319">Observations on Hippodonta (Bacillariophyceae) in selected ancient lakes</mods:title>
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<mods:namePart id="54375F0372E1B752BC87DDC32B5A59D1">Pavlov, Aleksandar</mods:namePart>
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<mods:namePart id="CE61926575B7BECAE5A89896B756D0FE">Levkov, Zlatko</mods:namePart>
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<mods:namePart id="FE3997C1B60E38F15BD593624F60DFCA">Williams, David M.</mods:namePart>
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<mods:namePart id="83B92C8B1CA312512829BE93517842F4">Edlund, Mark B.</mods:namePart>
<mods:affiliation id="186717693B2DCD6CD0237B73BBDE378B">St. Croix Watershed Research Station, Science Museum of Minnesota, Marine on St. Croix, Minnesota, USA.</mods:affiliation>
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<mods:title id="5CCE02C7D0B81C659A40D9279BB2157A">Phytotaxa</mods:title>
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<mods:date id="CF7CEFF5F4A9AB49C63C7DFFD9AC0F2F">2013</mods:date>
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<treatment id="065A87E62A6BA423FF5EFB18FD2E0AD1" ID-DOI="http://doi.org/10.5281/zenodo.5074126" ID-Zenodo-Dep="5074126" LSID="urn:lsid:plazi:treatment:065A87E62A6BA423FF5EFB18FD2E0AD1" httpUri="http://treatment.plazi.org/id/065A87E62A6BA423FF5EFB18FD2E0AD1" lastPageId="25" lastPageNumber="25" pageId="24" pageNumber="25">
<subSubSection id="C6E9657B2A6BA422FF5EFB18FB430EB1" box="[151,1237,1157,1183]" pageId="24" pageNumber="25" type="nomenclature">
<paragraph id="8E4C36F02A6BA422FF5EFB18FB430EB1" blockId="24.[151,1237,1157,1183]" box="[151,1237,1157,1183]" pageId="24" pageNumber="25">
<heading id="D504819C2A6BA422FF5EFB18FB430EB1" box="[151,1237,1157,1183]" fontSize="11" level="2" pageId="24" pageNumber="25" reason="3">
<taxonomicName id="49F34D732A6BA422FF5EFB18FC2F0EB1" authority="A. Pavlov, Levkov, D.M. Williams &amp; Edlund" authorityName="A. Pavlov, Levkov, D. M. Williams &amp; Edlund" authorityYear="2013" box="[151,953,1157,1183]" class="Bacillariophyceae" family="Naviculaceae" genus="Hippodonta" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="24" pageNumber="25" phylum="Bacillariophyta" rank="species" species="conspicua" status="sp. nov.">
<emphasis id="BC87EAE22A6BA422FF5EFB18FE350EB1" bold="true" box="[151,419,1157,1183]" italics="true" pageId="24" pageNumber="25">Hippodonta conspicua</emphasis>
A. Pavlov, Levkov, D.M. Williams &amp; Edlund
</taxonomicName>
,
<emphasis id="BC87EAE22A6BA422FC0DFB18FB8B0EB0" box="[964,1053,1157,1182]" italics="true" pageId="24" pageNumber="25">
<taxonomicNameLabel id="A7B457992A6BA422FC0DFB18FB8B0EB0" box="[964,1053,1157,1182]" pageId="24" pageNumber="25" rank="species">sp. nov.</taxonomicNameLabel>
</emphasis>
(
<figureCitation id="16C82A752A6BA422FBE5FB18FB5B0EB1" box="[1068,1229,1157,1183]" captionStart="FIGURES 308364" captionStartId="47.[151,269,1730,1754]" captionTargetBox="[289,1301,194,1706]" captionTargetId="figure-72@47.[264,1323,194,1706]" captionTargetPageId="47" captionText="FIGURES 308364: LM micrographs. Figs 308328. Hippodonta avittatiformis (type material). Figs 327, 328. Images of complete frustules in girdle view. Figs 329342. Hippodonta angustata (type material). Figs 343349. Hippodonta cocquytiae (type material). Figs 350353. Hippodonta conspicua (type material). Figs 354364. Hippodonta minuta (type material). Fig. 354. Complete frustule in girdle view. Scale bar = 10 µm." figureDoi="http://doi.org/10.5281/zenodo.5072000" httpUri="https://zenodo.org/record/5072000/files/figure.png" pageId="24" pageNumber="25">Figs 350353</figureCitation>
)
</heading>
</paragraph>
</subSubSection>
<subSubSection id="C6E9657B2A6BA422FF5EFB4FFC640CA6" pageId="24" pageNumber="25" type="materials_examined">
<paragraph id="8E4C36F02A6BA422FF5EFB4FFB7C0F27" blockId="24.[151,1436,1234,1289]" pageId="24" pageNumber="25">
<emphasis id="BC87EAE22A6BA422FF5EFB4FFF590EC4" bold="true" box="[151,207,1234,1258]" pageId="24" pageNumber="25">Type</emphasis>
:—
<materialsCitation id="3E9B3CAD2A6BA422FF24FB4FFB700F27" collectingDate="1953-02-04" collectorName="R. Ross." country="Tanzania" elevation="8" location="Lake Tanganyika" pageId="24" pageNumber="25" specimenCount="1" typeStatus="holotype">
<collectingCountry id="F6E476602A6BA422FF24FB4FFEED0EC7" box="[237,379,1234,1257]" name="Tanzania" pageId="24" pageNumber="25">TANZANIA</collectingCountry>
.
<location id="8B2C602B2A6BA422FE4CFB4FFDD60EC7" LSID="urn:lsid:plazi:treatment:065A87E62A6BA423FF5EFB18FD2E0AD1:8B2C602B2A6BA422FE4CFB4FFDD60EC7" box="[389,576,1234,1257]" country="Tanzania" name="Lake Tanganyika" pageId="24" pageNumber="25">Lake Tanganyika</location>
, tangled in trawl from
<elevation id="05DED1C32A6BA422FCFCFB4FFC350EC7" box="[821,931,1234,1257]" metricMagnitude="0" metricUnit="m" metricValue="8.0" pageId="24" pageNumber="25" unit="m" value="8.0">
<quantity id="490B9B152A6BA422FCFCFB4FFCC80EC7" box="[821,862,1234,1257]" metricMagnitude="0" metricUnit="m" metricValue="8.0" pageId="24" pageNumber="25" unit="m" value="8.0">8 m</quantity>
depth
</elevation>
, ¼ mile offshore
<locationDeviation id="9FFE2FD22A6BA422FB97FB4FFA150EC7" box="[1118,1411,1234,1257]" firstLocation="Kjiyi" pageId="24" pageNumber="25" secondLocation="Bangwe">between Kjiyi and Bangwe</locationDeviation>
,
<date id="FA4D10302A6BA422FA47FB4FFEF30F27" pageId="24" pageNumber="25" value="1953-02-04">
<collectingDate id="EA09E9D82A6BA422FA47FB4FFEF30F27" pageId="24" pageNumber="25" value="1953-02-04">4 February 1953</collectingDate>
</date>
, collector
<collectorName id="230653262A6BA422FE1DFB6FFDBD0F27" box="[468,555,1266,1289]" pageId="24" pageNumber="25">
<emphasis id="BC87EAE22A6BA422FE1DFB6FFDB20F27" box="[468,548,1266,1289]" italics="true" pageId="24" pageNumber="25">R. Ross</emphasis>
.
</collectorName>
(
<typeStatus id="514888522A6BA422FDF0FB6FFD0A0F27" box="[569,668,1266,1289]" pageId="24" pageNumber="25" type="holotype">holotype</typeStatus>
: slide BM! 72160; isotype: slide MKNDC! 005850/A)
</materialsCitation>
.
</paragraph>
<paragraph id="8E4C36F02A6BA422FF5EFAA4FC640CA6" blockId="24.[151,1436,1337,2020]" pageId="24" pageNumber="25">
Valves broadly elliptic-lanceolate to rhombic-lanceolate, with broadly rounded valve ends that are not protracted. Valve length 14.520.0 µm, width
<quantity id="490B9B152A6BA422FD71FAFDFCD50F54" box="[696,835,1376,1402]" metricMagnitude="-3" metricUnit="m" metricValue="5.5" metricValueMax="6.5" metricValueMin="4.5" pageId="24" pageNumber="25" unit="mm" value="5.5" valueMax="6.5" valueMin="4.5">4.56.5 µm</quantity>
. Axial area narrow-linear, slightly broadened close to valve centre. Central area small, variable in shape, rhombic or transversely elongated, defined by shortening of one stria from both valve sides. Terminal area clearly distinguishable in LM, broad and lunate. Raphe linear-filiform, with small, teardrop-shaped and closely spaced central pores. Terminal pores of raphe, vaguely discernible in LM, small circle-shaped, weakly advancing into terminal area. Striae coarse, moderately radiate in middle, becoming weakly convergent toward valve apices, evenly spaced throughout,
<quantity id="490B9B152A6BA422FF5EF9D5FF620C4C" box="[151,244,1608,1634]" metricMagnitude="-1" metricUnit="m" metricValue="2.286" metricValueMax="2.54" metricValueMin="2.032" pageId="24" pageNumber="25" unit="in" value="9.0" valueMax="10.0" valueMin="8.0">810 in</quantity>
<quantity id="490B9B152A6BA422FF34F9D5FEC70C4C" box="[253,337,1608,1634]" metricMagnitude="-2" metricUnit="m" metricValue="1.0" pageId="24" pageNumber="25" unit="mm" value="10.0">10 µm</quantity>
. Interstriae of equal or lower width than striae, more pronounced at mid-valve. Lineolae composing striae densely spaced along a stria, not distinguishable in LM.
</paragraph>
</subSubSection>
<subSubSection id="C6E9657B2A6BA423FF0FF908FD2E0AD1" lastPageId="25" lastPageNumber="26" pageId="24" pageNumber="25" type="distribution">
<paragraph id="8E4C36F02A6BA422FF0FF908FE7C0CF8" blockId="24.[151,1436,1337,2020]" pageId="24" pageNumber="25">
<emphasis id="BC87EAE22A6BA422FF0FF908FEC90C81" bold="true" box="[198,351,1685,1711]" pageId="24" pageNumber="25">Distribution</emphasis>
:—
<taxonomicName id="49F34D732A6BA422FE4DF908FD190C80" authorityName="A. Pavlov, Levkov, D. M. Williams &amp; Edlund" authorityYear="2013" box="[388,655,1685,1710]" class="Bacillariophyceae" family="Naviculaceae" genus="Hippodonta" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="24" pageNumber="25" phylum="Bacillariophyta" rank="species" species="conspicua">
<emphasis id="BC87EAE22A6BA422FE4DF908FD190C80" box="[388,655,1685,1710]" italics="true" pageId="24" pageNumber="25">Hippodonta conspicua</emphasis>
</taxonomicName>
has so far only been observed from Lake Tanganyika, East Africa. In the
<typeStatus id="514888522A6BA422FF2BF921FE820CF8" box="[226,276,1724,1750]" pageId="24" pageNumber="25">type</typeStatus>
material it is rare.
</paragraph>
<paragraph id="8E4C36F02A6BA423FF0FF97FFD2E0AD1" blockId="24.[151,1436,1337,2020]" lastBlockId="25.[151,1436,152,255]" lastPageId="25" lastPageNumber="26" pageId="24" pageNumber="25">
<emphasis id="BC87EAE22A6BA422FF0FF97FFEFA0CD2" bold="true" box="[198,364,1762,1788]" pageId="24" pageNumber="25">Observations</emphasis>
:—With regard to the appearance and the pattern of the striae and also the valve outline,
<taxonomicName id="49F34D732A6BA422FAB6F97EFE980D0C" authorityName="A. Pavlov, Levkov, D. M. Williams &amp; Edlund" authorityYear="2013" class="Bacillariophyceae" family="Naviculaceae" genus="Hippodonta" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="24" pageNumber="25" phylum="Bacillariophyta" rank="species" species="conspicua">
<emphasis id="BC87EAE22A6BA422FAB6F97EFA020CD2" box="[1407,1428,1763,1788]" italics="true" pageId="24" pageNumber="25">H</emphasis>
.
<emphasis id="BC87EAE22A6BA422FF5EF894FE980D0C" box="[151,270,1801,1826]" italics="true" pageId="24" pageNumber="25">conspicua</emphasis>
</taxonomicName>
is similar to
<taxonomicName id="49F34D732A6BA422FE60F894FDDA0D0C" authorityName="A. Pavlov, Levkov, D. M. Williams &amp; Edlund" authorityYear="2013" box="[425,588,1801,1827]" class="Bacillariophyceae" family="Naviculaceae" genus="Hippodonta" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="24" pageNumber="25" phylum="Bacillariophyta" rank="species" species="cocquytiae">
<emphasis id="BC87EAE22A6BA422FE60F894FE280D0C" box="[425,446,1801,1826]" italics="true" pageId="24" pageNumber="25">H</emphasis>
.
<emphasis id="BC87EAE22A6BA422FE04F894FDDA0D0C" box="[461,588,1801,1826]" italics="true" pageId="24" pageNumber="25">cocquytiae</emphasis>
</taxonomicName>
(
<figureCitation id="16C82A752A6BA422FD94F894FC970D0D" box="[605,769,1801,1827]" captionStart="FIGURES 308364" captionStartId="47.[151,269,1730,1754]" captionTargetBox="[289,1301,194,1706]" captionTargetId="figure-72@47.[264,1323,194,1706]" captionTargetPageId="47" captionText="FIGURES 308364: LM micrographs. Figs 308328. Hippodonta avittatiformis (type material). Figs 327, 328. Images of complete frustules in girdle view. Figs 329342. Hippodonta angustata (type material). Figs 343349. Hippodonta cocquytiae (type material). Figs 350353. Hippodonta conspicua (type material). Figs 354364. Hippodonta minuta (type material). Fig. 354. Complete frustule in girdle view. Scale bar = 10 µm." figureDoi="http://doi.org/10.5281/zenodo.5072000" httpUri="https://zenodo.org/record/5072000/files/figure.png" pageId="24" pageNumber="25">Figs 343349</figureCitation>
) also from Lake Tanganyika. Still, the central area of
<taxonomicName id="49F34D732A6BA422FAB6F894FE800D67" authorityName="A. Pavlov, Levkov, D. M. Williams &amp; Edlund" authorityYear="2013" class="Bacillariophyceae" family="Naviculaceae" genus="Hippodonta" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="24" pageNumber="25" phylum="Bacillariophyta" rank="species" species="cocquytiae">
<emphasis id="BC87EAE22A6BA422FAB6F894FA020D0C" box="[1407,1428,1801,1826]" italics="true" pageId="24" pageNumber="25">H</emphasis>
.
<emphasis id="BC87EAE22A6BA422FF5EF8ADFE800D67" box="[151,278,1840,1865]" italics="true" pageId="24" pageNumber="25">cocquytiae</emphasis>
</taxonomicName>
is consistently a relatively broad prominent fascia, while the central area of
<taxonomicName id="49F34D732A6BA422FB5EF8ADFAA40D67" authorityName="A. Pavlov, Levkov, D. M. Williams &amp; Edlund" authorityYear="2013" box="[1175,1330,1840,1866]" class="Bacillariophyceae" family="Naviculaceae" genus="Hippodonta" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="24" pageNumber="25" phylum="Bacillariophyta" rank="species" species="conspicua">
<emphasis id="BC87EAE22A6BA422FB5EF8ADFB3A0D67" box="[1175,1196,1840,1865]" italics="true" pageId="24" pageNumber="25">H</emphasis>
.
<emphasis id="BC87EAE22A6BA422FB72F8ADFAA40D67" box="[1211,1330,1840,1865]" italics="true" pageId="24" pageNumber="25">conspicua</emphasis>
</taxonomicName>
does not expand to the valve margins at the middle of the valve. The differences in the central area of these taxa make a clear and straightforward distinction between the two. With regard to the striae pattern and the shape of the central area,
<taxonomicName id="49F34D732A6BA422FEE5F839FE510D93" authorityName="A. Pavlov, Levkov, D. M. Williams &amp; Edlund" authorityYear="2013" box="[300,455,1956,1982]" class="Bacillariophyceae" family="Naviculaceae" genus="Hippodonta" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="24" pageNumber="25" phylum="Bacillariophyta" rank="species" species="conspicua">
<emphasis id="BC87EAE22A6BA422FEE5F839FED70D93" box="[300,321,1956,1981]" italics="true" pageId="24" pageNumber="25">H</emphasis>
.
<emphasis id="BC87EAE22A6BA422FE99F839FE510D93" box="[336,455,1956,1981]" italics="true" pageId="24" pageNumber="25">conspicua</emphasis>
</taxonomicName>
also resembles a taxon named “
<taxonomicName id="49F34D732A6BA422FCF7F839FC5C0D93" authorityName="Lange-Bert., Witkowski &amp; Metzeltin" authorityYear="1996" box="[830,970,1956,1981]" class="Bacillariophyceae" family="Naviculaceae" genus="Hippodonta" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="24" pageNumber="25" phylum="Bacillariophyta" rank="genus">
<emphasis id="BC87EAE22A6BA422FCF7F839FC5C0D93" box="[830,970,1956,1981]" italics="true" pageId="24" pageNumber="25">Hippodonta</emphasis>
</taxonomicName>
(?nov.) spec.” in
<bibRefCitation id="EA624B012A6BA422FB5EF839FA0E0D90" author="Metzeltin, D. &amp; Lange-Bertalot, H. &amp; Garcia-Rodriguez, F." box="[1175,1432,1956,1982]" pageId="24" pageNumber="25" pagination="1 - 736" refId="ref27945" refString="Metzeltin, D., Lange-Bertalot, H. &amp; Garcia-Rodriguez, F. (2005) Diatoms of Uruguay. Compared with other taxa from South America and elsewhere. Iconographia Diatomologica 15: 1 - 736." type="journal article" year="2005">
Metzeltin
<emphasis id="BC87EAE22A6BA422FAC7F839FADE0D93" box="[1294,1352,1956,1981]" italics="true" pageId="24" pageNumber="25">et al.</emphasis>
(2005
</bibRefCitation>
: figs 59: 3740). The latter taxon has clearly linear-elliptic valve outline with nearly parallel valve margins in the middle, as compared to the broadly elliptic-lanceolate valves of
<taxonomicName id="49F34D732A6AA423FC79FF05FBDD0A9F" authorityName="A. Pavlov, Levkov, D. M. Williams &amp; Edlund" authorityYear="2013" box="[944,1099,152,178]" class="Bacillariophyceae" family="Naviculaceae" genus="Hippodonta" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="25" pageNumber="26" phylum="Bacillariophyta" rank="species" species="conspicua">
<emphasis id="BC87EAE22A6AA423FC79FF05FC530A9F" box="[944,965,152,177]" italics="true" pageId="25" pageNumber="26">H</emphasis>
.
<emphasis id="BC87EAE22A6AA423FC1DFF05FBDD0A9F" box="[980,1099,152,177]" italics="true" pageId="25" pageNumber="26">conspicua</emphasis>
</taxonomicName>
. Furthermore, in most of the specimens of the taxon in
<bibRefCitation id="EA624B012A6AA423FE18FF23FD480AF6" author="Metzeltin, D. &amp; Lange-Bertalot, H. &amp; Garcia-Rodriguez, F." box="[465,734,190,216]" pageId="25" pageNumber="26" pagination="1 - 736" refId="ref27945" refString="Metzeltin, D., Lange-Bertalot, H. &amp; Garcia-Rodriguez, F. (2005) Diatoms of Uruguay. Compared with other taxa from South America and elsewhere. Iconographia Diatomologica 15: 1 - 736." type="journal article" year="2005">
Metzeltin
<emphasis id="BC87EAE22A6AA423FD82FF22FD110AF6" box="[587,647,191,216]" italics="true" pageId="25" pageNumber="26">et al.</emphasis>
(2005)
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the lineolae are clearly discernible in LM view, which has not been observed in the case of
<taxonomicName id="49F34D732A6AA423FDDFFF78FD270AD0" authorityName="A. Pavlov, Levkov, D. M. Williams &amp; Edlund" authorityYear="2013" box="[534,689,229,255]" class="Bacillariophyceae" family="Naviculaceae" genus="Hippodonta" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="25" pageNumber="26" phylum="Bacillariophyta" rank="species" species="conspicua">
<emphasis id="BC87EAE22A6AA423FDDFFF78FDBD0AD0" box="[534,555,229,254]" italics="true" pageId="25" pageNumber="26">H</emphasis>
.
<emphasis id="BC87EAE22A6AA423FDF3FF78FD270AD0" box="[570,689,229,254]" italics="true" pageId="25" pageNumber="26">conspicua</emphasis>
</taxonomicName>
.
</paragraph>
</subSubSection>
</treatment>
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