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<document id="96168A0C7DA634030FC4651AAC9012BF" 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="065A87E62A6AA420FF5EFA21FAE00875" 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 pulchra A. Pavlov, Levkov, D. M. Williams &amp; Edlund 2013, sp. nov." docType="treatment" docVersion="3" lastPageNumber="27" masterDocId="FA63FF9E2A73A43AFFC9FF9DFF960A2E" masterDocTitle="Observations on Hippodonta (Bacillariophyceae) in selected ancient lakes" masterLastPageNumber="53" masterPageNumber="1" pageNumber="26" updateTime="1698991198074" updateUser="plazi" zenodo-license-document="CLOSED">
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<mods:title id="EBB29CF88D1F0B6BF585DFD8B2B4BC36">Observations on Hippodonta (Bacillariophyceae) in selected ancient lakes</mods:title>
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<mods:namePart id="A25E68A1FC8942CAABBD7E8923794826">Williams, David M.</mods:namePart>
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<mods:namePart id="19F354084E2A88E0E7F11C1BB7884D08">Edlund, Mark B.</mods:namePart>
<mods:affiliation id="A828217168ED402F350B5671342562DB">St. Croix Watershed Research Station, Science Museum of Minnesota, Marine on St. Croix, Minnesota, USA.</mods:affiliation>
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<paragraph id="8E4C36F02A6AA423FF5EFA21FB2F0FF8" blockId="25.[151,1209,1468,1494]" box="[151,1209,1468,1494]" pageId="25" pageNumber="26">
<heading id="D504819C2A6AA423FF5EFA21FB2F0FF8" box="[151,1209,1468,1494]" fontSize="11" level="2" pageId="25" pageNumber="26" reason="3">
<taxonomicName id="49F34D732A6AA423FF5EFA21FC080FF8" authority="A. Pavlov, Levkov, D.M. Williams &amp; Edlund" authorityName="A. Pavlov, Levkov, D. M. Williams &amp; Edlund" authorityYear="2013" box="[151,926,1468,1494]" class="Bacillariophyceae" family="Naviculaceae" genus="Hippodonta" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="25" pageNumber="26" phylum="Bacillariophyta" rank="species" species="pulchra" status="sp. nov.">
<emphasis id="BC87EAE22A6AA423FF5EFA21FE1E0FF8" bold="true" box="[151,392,1468,1494]" italics="true" pageId="25" pageNumber="26">Hippodonta pulchra</emphasis>
A. Pavlov, Levkov, D.M. Williams &amp; Edlund
</taxonomicName>
,
<emphasis id="BC87EAE22A6AA423FC60FA21FB940FFB" box="[937,1026,1468,1493]" italics="true" pageId="25" pageNumber="26">
<taxonomicNameLabel id="A7B457992A6AA423FC60FA21FB940FFB" box="[937,1026,1468,1493]" pageId="25" pageNumber="26" rank="species">sp. nov.</taxonomicNameLabel>
</emphasis>
(
<figureCitation id="16C82A752A6AA423FBD8FA21FB270FF8" box="[1041,1201,1468,1494]" captionStart="FIGURES 365392" captionStartId="48.[151,271,1806,1830]" captionTargetBox="[264,1323,194,1782]" captionTargetId="figure-74@48.[264,1323,194,1782]" captionTargetPageId="48" captionText="FIGURES 365392: LM micrographs. Figs 365372. Hippodonta pulchra (type material). Figs 366, 367. Images of same valve at different focus. Fig. 372. Complete frustule in girdle view. Figs 373376. Hippodonta costuloides. Fig. 373. Image of broken initial cell. Figs 377392. Hippodonta intermedia. Fig. 380. Complete frustule in girdle view. Scale bar = 10 µm." figureDoi="http://doi.org/10.5281/zenodo.5072002" httpUri="https://zenodo.org/record/5072002/files/figure.png" pageId="25" pageNumber="26">Figs 365372</figureCitation>
)
</heading>
</paragraph>
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<subSubSection id="C6E9657B2A6AA423FF5EF99FFD950DF6" pageId="25" pageNumber="26" type="materials_examined">
<paragraph id="8E4C36F02A6AA423FF5EF99FFD760C17" blockId="25.[151,1436,1538,1593]" pageId="25" pageNumber="26">
<emphasis id="BC87EAE22A6AA423FF5EF99FFF590C34" bold="true" box="[151,207,1538,1562]" pageId="25" pageNumber="26">Type</emphasis>
:—
<materialsCitation id="3E9B3CAD2A6AA423FF26F99FFD4D0C17" collectingDate="1998-06-21" collectorName="D. M. Williams." country="Russia" elevation="5" location="Lake Baikal" municipality="Tolsky" pageId="25" pageNumber="26" specimenCount="1" typeStatus="holotype">
<collectingCountry id="F6E476602A6AA423FF26F99FFEC50C37" box="[239,339,1538,1561]" name="Russia" pageId="25" pageNumber="26">RUSSIA</collectingCountry>
.
<location id="8B2C602B2A6AA423FE96F99FFE700C37" LSID="urn:lsid:plazi:treatment:065A87E62A6AA420FF5EFA21FAE00875:8B2C602B2A6AA423FE96F99FFE700C37" box="[351,486,1538,1561]" country="Russia" municipality="Tolsky" name="Lake Baikal" pageId="25" pageNumber="26">Lake Baikal</location>
,
<collectingMunicipality id="6E28AC8A2A6AA423FE3AF99FFDAA0C37" box="[499,572,1538,1561]" pageId="25" pageNumber="26">Tolsky</collectingMunicipality>
, sediment,
<elevation id="05DED1C32A6AA423FD73F99FFCBB0C37" box="[698,813,1538,1561]" metricMagnitude="0" metricUnit="m" metricValue="5.0" pageId="25" pageNumber="26" unit="m" value="5.0">
<quantity id="490B9B152A6AA423FD73F99FFD700C37" box="[698,742,1538,1561]" metricMagnitude="0" metricUnit="m" metricValue="5.0" pageId="25" pageNumber="26" unit="m" value="5.0">5 m</quantity>
depth
</elevation>
,
<date id="FA4D10302A6AA423FCF2F99FFC470C37" box="[827,977,1538,1561]" pageId="25" pageNumber="26" value="1998-06-21">
<collectingDate id="EA09E9D82A6AA423FCF2F99FFC470C37" box="[827,977,1538,1561]" pageId="25" pageNumber="26" value="1998-06-21">21 June 1998</collectingDate>
</date>
, collector
<collectorName id="230653262A6AA423FB8CF99FFB7C0C37" box="[1093,1258,1538,1561]" pageId="25" pageNumber="26">
<emphasis id="BC87EAE22A6AA423FB8CF99FFB740C37" box="[1093,1250,1538,1561]" italics="true" pageId="25" pageNumber="26">D.M. Williams</emphasis>
.
</collectorName>
(
<typeStatus id="514888522A6AA423FB33F99FFACB0C37" box="[1274,1373,1538,1561]" pageId="25" pageNumber="26" type="holotype">holotype</typeStatus>
: slide BM! 100526; isotype: slide MKNDC! 005842/A)
</materialsCitation>
.
</paragraph>
<paragraph id="8E4C36F02A6AA423FF5EF9FFFD950DF6" blockId="25.[151,1436,1634,2008]" pageId="25" pageNumber="26">
Frustules rectangular in girdle view, quite broad. Valves broadly rhombic-lanceolate, with cuneate valve ends that are not protracted. Valve length 29.043.0 µm, breadth 8.0
<quantity id="490B9B152A6AA423FC4FF914FC7C0C8D" box="[902,1002,1673,1699]" metricMagnitude="-2" metricUnit="m" metricValue="1.05" pageId="25" pageNumber="26" unit="mm" value="10.5">10.5 µm</quantity>
. Axial area narrow-linear, expanding into a narrow-lanceolate, apically elongated central area. Plate-like structure present at the central area, following its shape, crossing the striae (
<figureCitation id="16C82A752A6AA423FDB0F94BFCB00CDE" box="[633,806,1750,1776]" captionStart="FIGURES 365392" captionStartId="48.[151,271,1806,1830]" captionTargetBox="[264,1323,194,1782]" captionTargetId="figure-74@48.[264,1323,194,1782]" captionTargetPageId="48" captionText="FIGURES 365392: LM micrographs. Figs 365372. Hippodonta pulchra (type material). Figs 366, 367. Images of same valve at different focus. Fig. 372. Complete frustule in girdle view. Figs 373376. Hippodonta costuloides. Fig. 373. Image of broken initial cell. Figs 377392. Hippodonta intermedia. Fig. 380. Complete frustule in girdle view. Scale bar = 10 µm." figureDoi="http://doi.org/10.5281/zenodo.5072002" httpUri="https://zenodo.org/record/5072002/files/figure.png" pageId="25" pageNumber="26">Figs 367371</figureCitation>
). Terminal area weakly distinguishable, quite small. Raphe linear, weakly lateral, with distinct, teardrop-shaped and distantly positioned central pores. Terminal pores of raphe distinct, equally pronounced as the central pores, teardrop-shaped and clearly advancing into the terminal area. Striae coarse, moderately to strongly radiate at the middle, becoming strongly convergent near valve ends,
<quantity id="490B9B152A6AA423FEA9F8ECFE5F0DA5" box="[352,457,1905,1931]" metricMagnitude="-1" metricUnit="m" metricValue="3.302" metricValueMax="3.556" metricValueMin="3.048" pageId="25" pageNumber="26" unit="in" value="13.0" valueMax="14.0" valueMin="12.0">1214 in</quantity>
<quantity id="490B9B152A6AA423FE1BF8ECFDB40DA5" box="[466,546,1905,1931]" metricMagnitude="-2" metricUnit="m" metricValue="1.0" pageId="25" pageNumber="26" unit="mm" value="10.0">10 µm</quantity>
. Interstriae of lower width than the striae, equally pronounced throughout. Lineolae composing the striae quite densely spaced within a stria, rarely discernible with LM, 57 within a stria at the middle of the valve.
</paragraph>
</subSubSection>
<subSubSection id="C6E9657B2A69A420FF0FFF0AFAE00875" pageId="26" pageNumber="27" type="distribution">
<paragraph id="8E4C36F02A69A420FF0FFF0AFC390B5D" blockId="26.[151,1436,151,603]" pageId="26" pageNumber="27">
<emphasis id="BC87EAE22A69A420FF0FFF0AFEC90A9F" bold="true" box="[198,351,151,177]" pageId="26" pageNumber="27">Distribution</emphasis>
:—
<taxonomicName id="49F34D732A69A420FE4DFF05FDE20A9F" authorityName="A. Pavlov, Levkov, D. M. Williams &amp; Edlund" authorityYear="2013" box="[388,628,152,177]" class="Bacillariophyceae" family="Naviculaceae" genus="Hippodonta" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="26" pageNumber="27" phylum="Bacillariophyta" rank="species" species="pulchra">
<emphasis id="BC87EAE22A69A420FE4DFF05FDE20A9F" box="[388,628,152,177]" italics="true" pageId="26" pageNumber="27">Hippodonta pulchra</emphasis>
</taxonomicName>
has so far only been observed in Lake Baikal,
<collectingCountry id="F6E476602A69A420FB65FF05FB680A9C" box="[1196,1278,152,178]" name="Russia" pageId="26" pageNumber="27">Russia</collectingCountry>
. This species was observed within the sediment of the lake littoral at shallow depth (
<quantity id="490B9B152A69A420FBCBFF23FBA00AF6" box="[1026,1078,190,216]" metricMagnitude="0" metricUnit="m" metricValue="5.0" pageId="26" pageNumber="27" unit="m" value="5.0">5 m</quantity>
). Few other
<taxonomicName id="49F34D732A69A420FB19FF22FAF70AF6" authorityName="Lange-Bert., Witkowski &amp; Metzeltin" authorityYear="1996" box="[1232,1377,191,216]" class="Bacillariophyceae" family="Naviculaceae" genus="Hippodonta" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="26" pageNumber="27" phylum="Bacillariophyta" rank="genus">
<emphasis id="BC87EAE22A69A420FB19FF22FAF70AF6" box="[1232,1377,191,216]" italics="true" pageId="26" pageNumber="27">Hippodonta</emphasis>
</taxonomicName>
taxa appear at the same locality, namely
<taxonomicName id="49F34D732A69A420FD8CFF78FD660AD0" box="[581,752,229,255]" class="Bacillariophyceae" family="Naviculaceae" genus="Navicula" higherTaxonomySource="CoL" kingdom="Animalia" order="Naviculales" pageId="26" pageNumber="27" phylum="Ochrophyta" rank="species" species="costuloides">
<emphasis id="BC87EAE22A69A420FD8CFF78FDCC0AD0" box="[581,602,229,254]" italics="true" pageId="26" pageNumber="27">H</emphasis>
.
<emphasis id="BC87EAE22A69A420FDA3FF78FD660AD0" box="[618,752,229,254]" italics="true" pageId="26" pageNumber="27">costuloides</emphasis>
</taxonomicName>
,
<taxonomicName id="49F34D732A69A420FCC9FF78FA890AD1" authority="(Skab.) Kulikovskiy, Metzeltin" authorityName="Kulikovskiy, Metzeltin" baseAuthorityName="Skab." box="[768,1311,229,255]" class="Bacillariophyceae" family="Naviculaceae" genus="Hippodonta" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="26" pageNumber="27" phylum="Bacillariophyta" rank="species" species="intermedia">
<emphasis id="BC87EAE22A69A420FCC9FF78FC830AD0" box="[768,789,229,254]" italics="true" pageId="26" pageNumber="27">H</emphasis>
.
<emphasis id="BC87EAE22A69A420FCECFF78FC300AD0" box="[805,934,229,254]" italics="true" pageId="26" pageNumber="27">intermedia</emphasis>
(Skab.) Kulikovskiy, Metzeltin
</taxonomicName>
&amp; Lange- Bert. in
<bibRefCitation id="EA624B012A69A420FF34FE91FDE60B08" author="Kulikovskiy, M. &amp; Lange-Bertalot, H. &amp; Metzeltin D. &amp; Witkowski, A." box="[253,624,268,294]" pageId="26" pageNumber="27" pagination="1 - 607" refId="ref27477" refString="Kulikovskiy, M., Lange-Bertalot, H., Metzeltin D. &amp; Witkowski, A. (2012) Lake Baikal: Hotspot of endemic diatoms, I. Iconographia Diatomologica 23: 1 - 607." type="journal article" year="2012">
Kulikovskiy
<emphasis id="BC87EAE22A69A420FE57FE91FE4B0B0B" box="[414,477,268,293]" italics="true" pageId="26" pageNumber="27">et al.</emphasis>
(2012: 148
</bibRefCitation>
, figs 66: 410) (≡
<taxonomicName id="49F34D732A69A420FC92FE91FAF10B08" authority="Skab." authorityName="Skab." box="[859,1383,268,294]" class="Bivalvia" family="Arcidae" genus="Navicula" higherTaxonomySource="CoL" kingdom="Animalia" order="Arcida" pageId="26" pageNumber="27" phylum="Mollusca" rank="variety" species="hungarica" variety="intermedia">
<emphasis id="BC87EAE22A69A420FC92FE91FBC60B0B" box="[859,1104,268,293]" italics="true" pageId="26" pageNumber="27">Navicula hungarica</emphasis>
var.
<emphasis id="BC87EAE22A69A420FB59FE91FA830B0B" box="[1168,1301,268,293]" italics="true" pageId="26" pageNumber="27">intermedia</emphasis>
Skab.
</taxonomicName>
),
<taxonomicName id="49F34D732A69A420FAB6FE91FEDC0B65" class="Bacillariophyceae" family="Naviculaceae" genus="Hippodonta" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="26" pageNumber="27" phylum="Bacillariophyta" rank="species" species="microcostulata">
<emphasis id="BC87EAE22A69A420FAB6FE91FA020B0B" box="[1407,1428,268,293]" italics="true" pageId="26" pageNumber="27">H</emphasis>
.
<emphasis id="BC87EAE22A69A420FF5EFEAFFEDC0B65" box="[151,330,306,331]" italics="true" pageId="26" pageNumber="27">microcostulata</emphasis>
</taxonomicName>
and
<taxonomicName id="49F34D732A69A420FE4FFEAFFB910B62" authority="Kulikovskiy, Lange-Bert. &amp; Metzeltin" authorityName="Kulikovskiy, Lange-Bert. &amp; Metzeltin" box="[390,1031,306,332]" class="Bacillariophyceae" family="Naviculaceae" genus="Hippodonta" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="26" pageNumber="27" phylum="Bacillariophyta" rank="species" species="subelegans">
<emphasis id="BC87EAE22A69A420FE4FFEAFFE0D0B65" box="[390,411,306,331]" italics="true" pageId="26" pageNumber="27">H</emphasis>
.
<emphasis id="BC87EAE22A69A420FE62FEAFFDA60B65" box="[427,560,306,331]" italics="true" pageId="26" pageNumber="27">subelegans</emphasis>
Kulikovskiy, Lange-Bert. &amp; Metzeltin
</taxonomicName>
in
<bibRefCitation id="EA624B012A69A420FBE6FEAFFA010B62" author="Kulikovskiy, M. &amp; Lange-Bertalot, H. &amp; Metzeltin D. &amp; Witkowski, A." box="[1071,1431,306,332]" pageId="26" pageNumber="27" pagination="1 - 607" refId="ref27477" refString="Kulikovskiy, M., Lange-Bertalot, H., Metzeltin D. &amp; Witkowski, A. (2012) Lake Baikal: Hotspot of endemic diatoms, I. Iconographia Diatomologica 23: 1 - 607." type="journal article" year="2012">
Kulikovskiy
<emphasis id="BC87EAE22A69A420FB02FEAFFA9E0B65" box="[1227,1288,306,331]" italics="true" pageId="26" pageNumber="27">et al.</emphasis>
(2012: 156
</bibRefCitation>
, 157, figs 67: 2629), with the latter two being of higher abundance.
</paragraph>
<paragraph id="8E4C36F02A69A420FF0FFEE2FAE00875" blockId="26.[151,1436,151,603]" pageId="26" pageNumber="27">
<emphasis id="BC87EAE22A69A420FF0FFEE2FEFA0BB7" bold="true" box="[198,364,383,409]" pageId="26" pageNumber="27">Observations</emphasis>
:—A combination of characters including the coarsely structured, broad and densely spaced striae, remarkably narrow interstriae, and the presence of a clearly observable plate-like structure at the centre of the valve that crosses the striae, make
<taxonomicName id="49F34D732A69A420FD5BFE50FC800BC8" authorityName="A. Pavlov, Levkov, D. M. Williams &amp; Edlund" authorityYear="2013" box="[658,790,461,487]" class="Bacillariophyceae" family="Naviculaceae" genus="Hippodonta" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="26" pageNumber="27" phylum="Bacillariophyta" rank="species" species="pulchra">
<emphasis id="BC87EAE22A69A420FD5BFE50FD310BC8" box="[658,679,461,486]" italics="true" pageId="26" pageNumber="27">H</emphasis>
.
<emphasis id="BC87EAE22A69A420FD71FE50FC800BC8" box="[696,790,461,486]" italics="true" pageId="26" pageNumber="27">pulchra</emphasis>
</taxonomicName>
readily distinguishable from other
<taxonomicName id="49F34D732A69A420FB01FE50FACF0BC8" authorityName="Lange-Bert., Witkowski &amp; Metzeltin" authorityYear="1996" box="[1224,1369,461,486]" class="Bacillariophyceae" family="Naviculaceae" genus="Hippodonta" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="26" pageNumber="27" phylum="Bacillariophyta" rank="genus">
<emphasis id="BC87EAE22A69A420FB01FE50FACF0BC8" box="[1224,1369,461,486]" italics="true" pageId="26" pageNumber="27">Hippodonta</emphasis>
</taxonomicName>
taxa. Nonetheless, specimens of shorter cell sizes of
<taxonomicName id="49F34D732A69A420FD05FE69FC350823" box="[716,931,500,526]" class="Bacillariophyceae" family="Naviculaceae" genus="Hippodonta" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="26" pageNumber="27" phylum="Bacillariophyta" rank="species" species="lueneburgensis">
<emphasis id="BC87EAE22A69A420FD05FE69FD770823" box="[716,737,500,525]" italics="true" pageId="26" pageNumber="27">H</emphasis>
.
<emphasis id="BC87EAE22A69A420FD38FE69FC350823" box="[753,931,500,525]" italics="true" pageId="26" pageNumber="27">lueneburgensis</emphasis>
</taxonomicName>
appear slightly similar to
<taxonomicName id="49F34D732A69A420FB17FE69FAC90823" authorityName="A. Pavlov, Levkov, D. M. Williams &amp; Edlund" authorityYear="2013" box="[1246,1375,500,526]" class="Bacillariophyceae" family="Naviculaceae" genus="Hippodonta" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="26" pageNumber="27" phylum="Bacillariophyta" rank="species" species="pulchra">
<emphasis id="BC87EAE22A69A420FB17FE69FB650823" box="[1246,1267,500,525]" italics="true" pageId="26" pageNumber="27">H</emphasis>
.
<emphasis id="BC87EAE22A69A420FACAFE69FAC90823" box="[1283,1375,500,525]" italics="true" pageId="26" pageNumber="27">pulchra</emphasis>
</taxonomicName>
with regard to the valve outline. However, the remarkably broad striae, the transverse rectangular central area and absence of additional structures in the central area of
<taxonomicName id="49F34D732A69A420FCC1FDDCFC4A0874" box="[776,988,577,603]" class="Bacillariophyceae" family="Naviculaceae" genus="Hippodonta" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="26" pageNumber="27" phylum="Bacillariophyta" rank="species" species="lueneburgensis">
<emphasis id="BC87EAE22A69A420FCC1FDDCFC8B0874" box="[776,797,577,602]" italics="true" pageId="26" pageNumber="27">H</emphasis>
.
<emphasis id="BC87EAE22A69A420FCE5FDDCFC4A0874" box="[812,988,577,602]" italics="true" pageId="26" pageNumber="27">lueneburgensis</emphasis>
</taxonomicName>
make the two taxa clearly distinct.
</paragraph>
</subSubSection>
</treatment>
</document>