<documentid="2ED322B34C1695ED56381BCDB6087AE6"ID-CLB-Dataset="303610"ID-DOI="10.3897/phytokeys.246.130942"ID-GBIF-Dataset="11a0958f-8d26-4732-8a33-b804390aa58c"ID-publisher-id="130942"URI-arpha="344C1E1C-11CD-50B3-9E52-721CFFBBB20E"XM.bibliography_approvedBy="admin"XM.materialsCitations_approvedBy="admin"XM.taxonomicNames_approvedBy="admin"article-type="research-article"checkinTime="1727188484138"checkinUser="pensoft"docAuthor="Zheng, Yan, Liu, Bing, Rioual, Patrick, Long, Ji-Yan & Zhou, Min"docDate="2024"docId="0772BC181D305679A729B75678CA0958"docLanguage="en"docName="PhytoKeys 246: 315-327"docOrigin="PhytoKeys 246"docSource="https://phytokeys.pensoft.net/article/130942/download/xml/"docStyle="DocumentStyle:PensoftTaxPub.0000.journal_article.phytokeys"docStyleName="PensoftTaxPub.0000.journal_article.phytokeys"docTitle="Ulnaria shun-biseriata Bing Liu & Rioual 2024, sp. nov."docType="treatment"docVersion="4"dtd-version="3.0"lastPageNumber="327"masterDocId="344C1E1C11CD50B39E52721CFFBBB20E"masterDocTitle="Ulnaria shun-biseriata sp. nov. (Bacillariophyta) from the Shun River in Hunan Province, China"masterLastPageNumber="327"masterPageNumber="315"pageNumber="315"updateTime="1727196717722"updateUser="admin">
<mods:titleid="DAA953FF29F34B7DDF982947581247F1">Ulnaria shun-biseriata sp. nov. (Bacillariophyta) from the Shun River in Hunan Province, China</mods:title>
<mods:affiliationid="D5CF3A9A2836122C134208307F21CB3B">Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, P. O. box 9825, Beijing 100029, China & CAS Center for Excellence in Life and Paleoenvironment, Beijing 100044, China</mods:affiliation>
<taxonomicNameid="2AF158262A41C773AA1B82DC37F64AF7"authority="Bing Liu & Rioual"authorityName="Bing Liu & Rioual"authorityYear="2024"class="Bacillariophyceae"family="Ulnariaceae"genus="Ulnaria"higherTaxonomySource="GBIF"kingdom="Plantae"order="Licmophorales"phylum="Ochrophyta"rank="species"species="shun-biseriata"status="sp. nov.">
<figureCitationid="FA237926C04B17B1BB6337F0FBE0487C"captionStart="Figure 1"captionStartId="F1"captionText="Figure 1. Ulnaria shun-biseriata sp. nov., LM A – I nine normal valves showing a size diminution series J – Q eight abnormal valves A illustration of holotype specimen. Scale bar: 10 μm (I)."figureDoi="10.3897/phytokeys.246.130942.figure1"httpUri="https://binary.pensoft.net/fig/1140530">Figs 1</figureCitation>
,
<figureCitationid="F323F127651ECBE1CA8B67E598954A8B"captionStart="Figure 2"captionStartId="F2"captionText="Figure 2. Ulnaria shun-biseriata sp. nov., external view, SEM A – C three complete valves, note biseriate striae and variable central areas D, E two apical details from A, note a few serrated projections protruding over the ocellulimbus (three arrows) F details of areolae showing the closing plates. Scale bars: 10 μm (A – C); 1 μm (D – F)."figureDoi="10.3897/phytokeys.246.130942.figure2"httpUri="https://binary.pensoft.net/fig/1140531">2</figureCitation>
,
<figureCitationid="CC0C8C7D34A0E1692AFDC1AD373F266D"captionStart="Figure 3"captionStartId="F3"captionText="Figure 3. Ulnaria shun-biseriata sp. nov., external view, SEM A valve with valvocopula B – D details from A showing the mantle, valvocopula and ocellulimbus. Scale bars: 10 μm (A); 1 μm (C – D)."figureDoi="10.3897/phytokeys.246.130942.figure3"httpUri="https://binary.pensoft.net/fig/1140532">3</figureCitation>
,
<figureCitationid="7782EC235D291DD0E26EB5C6AAEAB269"captionStart="Figure 4"captionStartId="F4"captionText="Figure 4. Ulnaria shun-biseriata sp. nov., SEM, internal view A – C three valves with closed valvocopulae D middle part detail from C note central area flanked by a few marginal striae only on one side and serrated projections over each virga (two arrows) E, F two apical details from C note unornamented valvocopula at both apices (arrow respectively). Scale bars: 10 μm (A – C); 1 μm (D – F)."figureDoi="10.3897/phytokeys.246.130942.figure4"httpUri="https://binary.pensoft.net/fig/1140533">4</figureCitation>
<specimenCodeid="61731878842B3BA3ABA0A3E32B344B9D"collectionCode="DIA"country="Angola"httpUri="http://biocol.org/urn:lsid:biocol.org:col:14994"lsid="urn:lsid:biocol.org:col:14994"name="Museu do Dundo"type="Herbarium">DIA 2024008</specimenCode>
, deposited in the herbarium of Jishou University (
<named-contentid="A0A113BB244599AD1B81DDE5E9264D5E"content-type="dwc:institutional_code"xlink_href="http://grbio.org/institution/jishou-university"xlink_title="Herbarium of Jishou University, Hunan, People’s Republic of China">
<figureCitationid="62BFD0978DC52AEE4731B653B04AB73A"captionStart="Figure 1"captionStartId="F1"captionText="Figure 1. Ulnaria shun-biseriata sp. nov., LM A – I nine normal valves showing a size diminution series J – Q eight abnormal valves A illustration of holotype specimen. Scale bar: 10 μm (I)."figureDoi="10.3897/phytokeys.246.130942.figure1"httpUri="https://binary.pensoft.net/fig/1140530">1 A</figureCitation>
<taxonomicNameid="69622C5881059DF794BF7CAA7C26A8AC"authorityName="Bing Liu & Rioual"authorityYear="2024"class="Bacillariophyceae"family="Fragilariaceae"genus="Ulnaria"higherTaxonomySource="GBIF"kingdom="Chromista"order="Fragilariales"phylum="Ochrophyta"rank="species"species="shun-biseriata"status="sp. nov.">
<figureCitationid="BADA4DA5CA949F0F43AFADA185B51C1D"captionStart="Figure 1"captionStartId="F1"captionText="Figure 1. Ulnaria shun-biseriata sp. nov., LM A – I nine normal valves showing a size diminution series J – Q eight abnormal valves A illustration of holotype specimen. Scale bar: 10 μm (I)."figureDoi="10.3897/phytokeys.246.130942.figure1"httpUri="https://binary.pensoft.net/fig/1140530">1</figureCitation>
). Valves lanceolate with slightly undulate valve margins and apiculate apices. Valve dimensions (n = 41): length 48–70 μm, width 8.3–10.7 μm at center. Sternum distinct, extending length of valve. Central area with two arrangements: an asymmetric hyaline region extending to both margins (Fig.
<figureCitationid="D66C3B67B71152158A611A41279217EA"captionStart="Figure 1"captionStartId="F1"captionText="Figure 1. Ulnaria shun-biseriata sp. nov., LM A – I nine normal valves showing a size diminution series J – Q eight abnormal valves A illustration of holotype specimen. Scale bar: 10 μm (I)."figureDoi="10.3897/phytokeys.246.130942.figure1"httpUri="https://binary.pensoft.net/fig/1140530">1 B – F</figureCitation>
) or a hyaline area which extends to one margin with the other side bordered with a few shortened striae (Fig.
<figureCitationid="991F73C9B652FCB6A8860C8ADD092FE7"captionStart="Figure 1"captionStartId="F1"captionText="Figure 1. Ulnaria shun-biseriata sp. nov., LM A – I nine normal valves showing a size diminution series J – Q eight abnormal valves A illustration of holotype specimen. Scale bar: 10 μm (I)."figureDoi="10.3897/phytokeys.246.130942.figure1"httpUri="https://binary.pensoft.net/fig/1140530">1 A, G – I</figureCitation>
). Ghost striae sometimes present (e. g. Fig.
<figureCitationid="0121D3397A93CD74EF943F21CC6A7C78"captionStart="Figure 1"captionStartId="F1"captionText="Figure 1. Ulnaria shun-biseriata sp. nov., LM A – I nine normal valves showing a size diminution series J – Q eight abnormal valves A illustration of holotype specimen. Scale bar: 10 μm (I)."figureDoi="10.3897/phytokeys.246.130942.figure1"httpUri="https://binary.pensoft.net/fig/1140530">1 C, D</figureCitation>
) in the central area. Striae parallel, mostly opposite one another across sternum. Stria density 8.5–11 (often 10) in 10 μm. Many abnormal valves found, all of which exhibit an asymmetry relative to the apical axis due to the valve middle part only expanding on one side, and more undulate valve margins (Fig.
<figureCitationid="9CA4F599E1B63E1C59C500F4BF85C9A1"captionStart="Figure 1"captionStartId="F1"captionText="Figure 1. Ulnaria shun-biseriata sp. nov., LM A – I nine normal valves showing a size diminution series J – Q eight abnormal valves A illustration of holotype specimen. Scale bar: 10 μm (I)."figureDoi="10.3897/phytokeys.246.130942.figure1"httpUri="https://binary.pensoft.net/fig/1140530">1 J – Q</figureCitation>
) than normal valves (Fig.
<figureCitationid="8C59E5608F994CBF77CA115EE334616C"captionStart="Figure 1"captionStartId="F1"captionText="Figure 1. Ulnaria shun-biseriata sp. nov., LM A – I nine normal valves showing a size diminution series J – Q eight abnormal valves A illustration of holotype specimen. Scale bar: 10 μm (I)."figureDoi="10.3897/phytokeys.246.130942.figure1"httpUri="https://binary.pensoft.net/fig/1140530">1 A – I</figureCitation>
).
</paragraph>
<paragraphid="A3E06CFB64FE5FBCB1F552E87F1A8533">
<abbrevid="ABBRID0EXLAC"xlink_title="scanning electron microscope">
<figureCitationid="801DFF7F197588C954B4117F30CB4F28"captionStart="Figure 2"captionStartId="F2"captionText="Figure 2. Ulnaria shun-biseriata sp. nov., external view, SEM A – C three complete valves, note biseriate striae and variable central areas D, E two apical details from A, note a few serrated projections protruding over the ocellulimbus (three arrows) F details of areolae showing the closing plates. Scale bars: 10 μm (A – C); 1 μm (D – F)."figureDoi="10.3897/phytokeys.246.130942.figure2"httpUri="https://binary.pensoft.net/fig/1140531">2</figureCitation>
–
<figureCitationid="4B38F818A4E0F8CF03892B282EC0D0B6"captionStart="Figure 4"captionStartId="F4"captionText="Figure 4. Ulnaria shun-biseriata sp. nov., SEM, internal view A – C three valves with closed valvocopulae D middle part detail from C note central area flanked by a few marginal striae only on one side and serrated projections over each virga (two arrows) E, F two apical details from C note unornamented valvocopula at both apices (arrow respectively). Scale bars: 10 μm (A – C); 1 μm (D – F)."figureDoi="10.3897/phytokeys.246.130942.figure4"httpUri="https://binary.pensoft.net/fig/1140533">4</figureCitation>
). Valves characterized by relatively wide virgae, interconnected with thin viminules, areolar closing plates having a few struts fixing them onto the areolar wall (Figs
<figureCitationid="B9067603BFB6550EAF817DE41271DFCB"captionStart="Figure 2"captionStartId="F2"captionText="Figure 2. Ulnaria shun-biseriata sp. nov., external view, SEM A – C three complete valves, note biseriate striae and variable central areas D, E two apical details from A, note a few serrated projections protruding over the ocellulimbus (three arrows) F details of areolae showing the closing plates. Scale bars: 10 μm (A – C); 1 μm (D – F)."figureDoi="10.3897/phytokeys.246.130942.figure2"httpUri="https://binary.pensoft.net/fig/1140531">2</figureCitation>
–
<figureCitationid="466F41BDB8A47C1726B9C76F68B367CB"captionStart="Figure 4"captionStartId="F4"captionText="Figure 4. Ulnaria shun-biseriata sp. nov., SEM, internal view A – C three valves with closed valvocopulae D middle part detail from C note central area flanked by a few marginal striae only on one side and serrated projections over each virga (two arrows) E, F two apical details from C note unornamented valvocopula at both apices (arrow respectively). Scale bars: 10 μm (A – C); 1 μm (D – F)."figureDoi="10.3897/phytokeys.246.130942.figure4"httpUri="https://binary.pensoft.net/fig/1140533">4</figureCitation>
). Valves with mixed striae, mostly biseriate. Two rimoportulae per valve, one at each pole, externally expressed as simple holes (Fig.
<figureCitationid="D523C93A8C06569A929194A5DBF757C2"captionStart="Figure 2"captionStartId="F2"captionText="Figure 2. Ulnaria shun-biseriata sp. nov., external view, SEM A – C three complete valves, note biseriate striae and variable central areas D, E two apical details from A, note a few serrated projections protruding over the ocellulimbus (three arrows) F details of areolae showing the closing plates. Scale bars: 10 μm (A – C); 1 μm (D – F)."figureDoi="10.3897/phytokeys.246.130942.figure2"httpUri="https://binary.pensoft.net/fig/1140531">2 E</figureCitation>
), internally bilabiate, situated close to sternum (Fig.
<figureCitationid="24FEA2D7B76030AFBDD4005D9F5ABC71"captionStart="Figure 4"captionStartId="F4"captionText="Figure 4. Ulnaria shun-biseriata sp. nov., SEM, internal view A – C three valves with closed valvocopulae D middle part detail from C note central area flanked by a few marginal striae only on one side and serrated projections over each virga (two arrows) E, F two apical details from C note unornamented valvocopula at both apices (arrow respectively). Scale bars: 10 μm (A – C); 1 μm (D – F)."figureDoi="10.3897/phytokeys.246.130942.figure4"httpUri="https://binary.pensoft.net/fig/1140533">4 E</figureCitation>
). Ocellulimbus composed of pervalvar columns and transverse rows of porelli (Fig.
<figureCitationid="E35D38FFBFD3177A96D11204491FCCF1"captionStart="Figure 2"captionStartId="F2"captionText="Figure 2. Ulnaria shun-biseriata sp. nov., external view, SEM A – C three complete valves, note biseriate striae and variable central areas D, E two apical details from A, note a few serrated projections protruding over the ocellulimbus (three arrows) F details of areolae showing the closing plates. Scale bars: 10 μm (A – C); 1 μm (D – F)."figureDoi="10.3897/phytokeys.246.130942.figure2"httpUri="https://binary.pensoft.net/fig/1140531">2 D</figureCitation>
,
<figureCitationid="289CBA89844A777456CC45F70CE20F24"captionStart="Figure 3"captionStartId="F3"captionText="Figure 3. Ulnaria shun-biseriata sp. nov., external view, SEM A valve with valvocopula B – D details from A showing the mantle, valvocopula and ocellulimbus. Scale bars: 10 μm (A); 1 μm (C – D)."figureDoi="10.3897/phytokeys.246.130942.figure3"httpUri="https://binary.pensoft.net/fig/1140532">3 C</figureCitation>
). A few serrated apical outgrowths protruding over the ocellulimbus (Fig.
<figureCitationid="5E48E83593CB11B0F961264603F97E9E"captionStart="Figure 2"captionStartId="F2"captionText="Figure 2. Ulnaria shun-biseriata sp. nov., external view, SEM A – C three complete valves, note biseriate striae and variable central areas D, E two apical details from A, note a few serrated projections protruding over the ocellulimbus (three arrows) F details of areolae showing the closing plates. Scale bars: 10 μm (A – C); 1 μm (D – F)."figureDoi="10.3897/phytokeys.246.130942.figure2"httpUri="https://binary.pensoft.net/fig/1140531">2 E</figureCitation>
). Valvocopula is a closed hoop, attached to the mantle interior, surrounding internal valve margin (Fig.
<figureCitationid="C03C300255F4FE6861EF6FAB7C8B8C71"captionStart="Figure 4"captionStartId="F4"captionText="Figure 4. Ulnaria shun-biseriata sp. nov., SEM, internal view A – C three valves with closed valvocopulae D middle part detail from C note central area flanked by a few marginal striae only on one side and serrated projections over each virga (two arrows) E, F two apical details from C note unornamented valvocopula at both apices (arrow respectively). Scale bars: 10 μm (A – C); 1 μm (D – F)."figureDoi="10.3897/phytokeys.246.130942.figure4"httpUri="https://binary.pensoft.net/fig/1140533">4 C – F</figureCitation>
). Each valvocopula bears a mostly continuous row of poroids dividing the pars interior from pars exterior, located at midline (Fig.
<figureCitationid="D8A79022B5756A2D377A02423BFE2762"captionStart="Figure 3"captionStartId="F3"captionText="Figure 3. Ulnaria shun-biseriata sp. nov., external view, SEM A valve with valvocopula B – D details from A showing the mantle, valvocopula and ocellulimbus. Scale bars: 10 μm (A); 1 μm (C – D)."figureDoi="10.3897/phytokeys.246.130942.figure3"httpUri="https://binary.pensoft.net/fig/1140532">3 B – C</figureCitation>
, arrows); lacking ornamentation at either apex (Fig.
<figureCitationid="86A31C77147167B5C1B1138DD3069821"captionStart="Figure 4"captionStartId="F4"captionText="Figure 4. Ulnaria shun-biseriata sp. nov., SEM, internal view A – C three valves with closed valvocopulae D middle part detail from C note central area flanked by a few marginal striae only on one side and serrated projections over each virga (two arrows) E, F two apical details from C note unornamented valvocopula at both apices (arrow respectively). Scale bars: 10 μm (A – C); 1 μm (D – F)."figureDoi="10.3897/phytokeys.246.130942.figure4"httpUri="https://binary.pensoft.net/fig/1140533">4 E, F</figureCitation>
, arrow respectively). On its advalvar edge, valvocopula bears a row of serrated projections, each corresponding internally to a virga (Fig.
<figureCitationid="EECF3E6D16351E58B838633B8F9395F5"captionStart="Figure 4"captionStartId="F4"captionText="Figure 4. Ulnaria shun-biseriata sp. nov., SEM, internal view A – C three valves with closed valvocopulae D middle part detail from C note central area flanked by a few marginal striae only on one side and serrated projections over each virga (two arrows) E, F two apical details from C note unornamented valvocopula at both apices (arrow respectively). Scale bars: 10 μm (A – C); 1 μm (D – F)."figureDoi="10.3897/phytokeys.246.130942.figure4"httpUri="https://binary.pensoft.net/fig/1140533">4 D</figureCitation>
<taxonomicNameid="68C06278599669C3AF852208DFBA50A8"authorityName="Bing Liu & Rioual"authorityYear="2024"class="Bacillariophyceae"family="Fragilariaceae"genus="Ulnaria"higherTaxonomySource="GBIF"kingdom="Chromista"order="Fragilariales"phylum="Ochrophyta"rank="species"species="shun-biseriata"status="sp. nov.">
<taxonomicNameid="30582F4884040C6B8AD6696FE42FEF9F"authorityName="Bing Liu & Rioual"authorityYear="2024"class="Bacillariophyceae"family="Fragilariaceae"genus="Ulnaria"higherTaxonomySource="GBIF"kingdom="Chromista"order="Fragilariales"phylum="Ochrophyta"rank="species"species="shun-biseriata"status="sp. nov.">
<taxonomicNameid="C97AFBE8F7D8E8C187ADD94CA4BD2EEC"authorityName="Bing Liu & Rioual"authorityYear="2024"class="Bacillariophyceae"family="Fragilariaceae"genus="Ulnaria"higherTaxonomySource="GBIF"kingdom="Chromista"order="Fragilariales"phylum="Ochrophyta"rank="species"species="shun-biseriata"status="sp. nov.">
Known only from the type locality in which it is a common species with ca. 1 % relative abundance. The samples that included this species were scraped off the surface of stones collected in the Shun River. Hence this is a benthic, epilithic species. The associated taxa include
