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<document ID-CLB-Dataset="153632" ID-DOI="http://dx.doi.org/10.3897/phytokeys.210.90876" ID-GBIF-Dataset="bfa1ec89-3897-477d-9f54-bc0bf029022c" ID-PMC="PMC9848899" ID-Pensoft-Pub="1314-2003-210-23" ID-Pensoft-UUID="3FA14DBF2C42505C91894D9339A62DAB" ID-PubMed="36760410" ModsDocID="1314-2003-210-23" checkinTime="1664443317363" checkinUser="pensoft" docAuthor="Liu, Honghan, Wang, Zhen, Wu, Weiwei, Li, Chenhong, Zhang, Jiawei, Gao, Yahui, Li, Xuesong, Sun, Lin, Liang, Junrong, Zhang, Jun &amp; Chen, Changping" docDate="2022" docId="61E9F804E0AC59248751A40915BCB6A9" docLanguage="en" docName="PhytoKeys 210: 23-34" docOrigin="PhytoKeys 210" docPubDate="2022-09-28" docSource="http://dx.doi.org/10.3897/phytokeys.210.90876" docTitle="Ambo dajingensis HH Liu, Z Wang, YH Gao &amp; CP Chen 2022, sp. nov." docType="treatment" docVersion="6" id="3FA14DBF2C42505C91894D9339A62DAB" lastPageNumber="23" masterDocId="3FA14DBF2C42505C91894D9339A62DAB" masterDocTitle="A new marine epipsammic diatom species, Ambo dajingensis sp. nov. (Bacillariophyceae), from the coast of Southeast China" masterLastPageNumber="34" masterPageNumber="23" pageNumber="23" updateTime="1720543705459" updateUser="ExternalLinkService">
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<mods:title id="13044783F5B6BC9B549BBDF5582D81F9">A new marine epipsammic diatom species, Ambo dajingensis sp. nov. (Bacillariophyceae), from the coast of Southeast China</mods:title>
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<mods:name id="9610D4B8203FDF0A8BBC031C29C3F7BF" type="personal">
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<mods:namePart id="E5A4377AF5471FC7161CE4C57FC4EA6C">Liu, Honghan</mods:namePart>
<mods:affiliation id="3C00186F699A00C3E5ED2DE8B873D8AE">Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems and School of Life Sciences, Xiamen University, Xiamen 361102, China</mods:affiliation>
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<mods:namePart id="08622D429CD557D73480105ACEB82085">Wang, Zhen</mods:namePart>
<mods:affiliation id="AB0BD0FFF0DFDFD5F899DAA135B52288">Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems and School of Life Sciences, Xiamen University, Xiamen 361102, China</mods:affiliation>
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<mods:namePart id="3BFF8C711BDC00F22ADB3A76A075DADF">Wu, Weiwei</mods:namePart>
<mods:affiliation id="6900EA8367347B99A17BD4D4A7F8D14F">Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems and School of Life Sciences, Xiamen University, Xiamen 361102, China</mods:affiliation>
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<mods:namePart id="889D4465130EF2F29A14696E65675D73">Li, Chenhong</mods:namePart>
<mods:affiliation id="A82DDBFB872AED40FE31683837100CA7">Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems and School of Life Sciences, Xiamen University, Xiamen 361102, China</mods:affiliation>
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<mods:namePart id="7BF1018FC30F4B98D871A78F60FD350F">Zhang, Jiawei</mods:namePart>
<mods:affiliation id="189E8515F6B7B5513F0EDC6901A7B1C4">Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems and School of Life Sciences, Xiamen University, Xiamen 361102, China</mods:affiliation>
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<mods:namePart id="3A4015E17496417DA91AAA7261D37B4A">Gao, Yahui</mods:namePart>
<mods:affiliation id="C0AB3025931D6F6772AFE211775D790F">Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems and School of Life Sciences, Xiamen University, Xiamen 361102, China</mods:affiliation>
<mods:nameIdentifier id="13CF3E3B8F3409CCFB46CBF8F8F70C25" type="email">gaoyh@xmu.edu.cn</mods:nameIdentifier>
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<mods:namePart id="7185FB6EF550695E9616D9818F3D1ED3">Li, Xuesong</mods:namePart>
<mods:affiliation id="DBC6B5D94CFE3784589682EA021A1D9F">Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems and School of Life Sciences, Xiamen University, Xiamen 361102, China</mods:affiliation>
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<mods:namePart id="C8D67A71C3475781999CE3F2130C6A56">Sun, Lin</mods:namePart>
<mods:affiliation id="586050854787A9CF821ECDF74131FAF9">Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems and School of Life Sciences, Xiamen University, Xiamen 361102, China</mods:affiliation>
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<mods:namePart id="11D6482CC5CA21D9400BDCF58F3694F4">Liang, Junrong</mods:namePart>
<mods:affiliation id="DCFC977069B2A1AC40E7F5737C45C5F0">Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems and School of Life Sciences, Xiamen University, Xiamen 361102, China</mods:affiliation>
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<mods:namePart id="4154136EE5B1B0BFFAA8EDF51653E111">Zhang, Jun</mods:namePart>
<mods:affiliation id="BBAA083DF7E38E32FEAF614B1E3043CA">Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems and School of Life Sciences, Xiamen University, Xiamen 361102, China</mods:affiliation>
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<mods:namePart id="B98E66AC26A6B1322A1669AFEE8E2702">Chen, Changping</mods:namePart>
<mods:affiliation id="1C33EA0883580807EDCE44539411427A">Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems and School of Life Sciences, Xiamen University, Xiamen 361102, China</mods:affiliation>
<mods:nameIdentifier id="960FFAD1F8115D2EB1C398F2F298B642" type="email">chencp@xmu.edu.cn</mods:nameIdentifier>
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<mods:title id="0F364376DFB3E30391EB41DDC6F10CEA">PhytoKeys</mods:title>
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<mods:part id="CE52439D538E4F8C85F68A298598D344">
<mods:date id="D0648F6BA76937FDD8058853422717D0">2022</mods:date>
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<mods:number id="EFD87E547E3DEA695CEC36E2C5D05F9F">2022-09-28</mods:number>
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<mods:number id="0E90E233AD43DC7386595081BBBE5584">210</mods:number>
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<mods:start id="B604FD28272A34CE99D63DDA796FC882">23</mods:start>
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<mods:url id="F3D7BAD260B2B3AE502E181BAB7F12DC">http://dx.doi.org/10.3897/phytokeys.210.90876</mods:url>
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<mods:classification id="E22509B95354FF705164B007CC928422">journal article</mods:classification>
<mods:identifier id="6BB273D27C9BC63D30ECD3CB14C9D511" type="DOI">http://dx.doi.org/10.3897/phytokeys.210.90876</mods:identifier>
<mods:identifier id="5C64E4C07DFF64CB43D8D36D0A78E26E" type="Pensoft-Pub">1314-2003-210-23</mods:identifier>
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<treatment id="61E9F804E0AC59248751A40915BCB6A9" ID-GBIF-Taxon="201134828" LSID="urn:lsid:plazi:treatment:61E9F804E0AC59248751A40915BCB6A9" httpUri="http://treatment.plazi.org/id/61E9F804E0AC59248751A40915BCB6A9" lastPageNumber="23" pageId="0" pageNumber="23">
<subSubSection id="2F3E7D072802DE1CC75DFDF6ED4AB9D3" pageId="0" pageNumber="23" type="nomenclature">
<paragraph id="9CDDD4CB0F402B0F82DE91B45397A526" pageId="0" pageNumber="23">
<taxonomicName id="B48FE4A1D49EE3F7800D71F73EC65B59" LSID="61E9F804-E0AC-5924-8751-A40915BCB6A9" authority="HH Liu, Z Wang, YH Gao &amp; CP Chen" authorityName="HH Liu, Z Wang, YH Gao &amp; CP Chen" authorityYear="2022" class="Bacillariophyceae" family="Grammatophoraceae" genus="Ambo" higherTaxonomySource="treatment-meta" kingdom="Chromista" lsidName="Ambo dajingensis" order="Rhabdonematales" pageId="0" pageNumber="23" phylum="Ochrophyta" rank="species" species="dajingensis" status="sp. nov.">Ambo dajingensis HH Liu, Z Wang, YH Gao &amp; CP Chen</taxonomicName>
<taxonomicNameLabel id="1F0AF41787CA00CD80C6E04F404B7684" pageId="0" pageNumber="23">sp. nov.</taxonomicNameLabel>
</paragraph>
</subSubSection>
<subSubSection id="D4A5BE6F4C4CDDF8BB2D9ABC66A8248F" pageId="0" pageNumber="23" type="description">
<paragraph id="AABCA0C2012BAB474096FD9DE2EB6B9A" pageId="0" pageNumber="23">
<figureCitation id="0F92937C0A0A64FA6500B07B63624229" captionStart="Figure 2" captionStartId="F2" captionText="Figure 2. Light micrographs (LM) of Ambo dajingensis sp. nov. A-F valve showing the size and shape G-I girdle view. Scale bar: 5 µm." figureDoi="10.3897/phytokeys.210.90876.figure2" httpUri="https://binary.pensoft.net/fig/749971" pageId="0" pageNumber="23">Figs 2</figureCitation>
<figureCitation id="BD76F53BF382DB2B4C016B2AF2D8EC52" captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. Scanning electron microscopy (SEM) images of Ambo dajingensis sp. nov. in an external view of the entire valve A, B external valve view of the whole specimen. There is a hyaline valve face over most of the length and transapical striae develop only at the valve apex, with a weakly expressed sternum at the apices C, E, F fan-shaped spines (arrows) are arranged along the valve margin, there is striation, a strongly expressed sternum on the valve apical part, a small circular striated area structure on the mantle apex D the girdle bands. Scale bar: 1 µm." figureDoi="10.3897/phytokeys.210.90876.figure3" httpUri="https://binary.pensoft.net/fig/749972" pageId="0" pageNumber="23">, 3</figureCitation>
<figureCitation id="CACF01821A5CD513C16A058EE1FE788A" captionStart="Figure 4" captionStartId="F4" captionText="Figure 4. Scanning electron microscopy (SEM) images of Ambo dajingensis sp. nov. in an internal view of the entire valve A, C internal valve view of the whole specimen B, D the presence of costae (arrows) and the areolation. Scale bars: 3 µm (A); 1 µm (B); 5 µm (C); 2 µm (D)." figureDoi="10.3897/phytokeys.210.90876.figure4" httpUri="https://binary.pensoft.net/fig/749973" pageId="0" pageNumber="23">, 4</figureCitation>
</paragraph>
</subSubSection>
<subSubSection id="A1E2F2958204EE43BFC9B454E78D723B" pageId="0" pageNumber="23" type="holotype">
<paragraph id="3323ACB24F9B03FBDED8CCA8BD5D4E35" pageId="0" pageNumber="23">Holotype</paragraph>
<paragraph id="37287C2A02843767747E7CF179796A8B" pageId="0" pageNumber="23">
<emphasis id="8A7A32FBEB46196936740B37D4A3A274" bold="true" pageId="0" pageNumber="23">(here designated)</emphasis>
: slide DJ1805 (AU, Biology Department Herbarium, Xiamen University). Fig.
<figureCitation id="7BD1081A6897E727EC34B402424C5705" captionStart="Figure 2" captionStartId="F2" captionText="Figure 2. Light micrographs (LM) of Ambo dajingensis sp. nov. A-F valve showing the size and shape G-I girdle view. Scale bar: 5 µm." figureDoi="10.3897/phytokeys.210.90876.figure2" httpUri="https://binary.pensoft.net/fig/749971" pageId="0" pageNumber="23">2E</figureCitation>
represents holotype.
</paragraph>
</subSubSection>
<subSubSection id="A596F5CACCB4ABDB452913BA7C4E4EEA" pageId="0" pageNumber="23" type="type locality">
<paragraph id="73B6D7B12F76719FB35C7BCD6AD6385B" pageId="0" pageNumber="23">Type locality.</paragraph>
<paragraph id="C719349FDBAC68273EFFB4361F52EA12" pageId="0" pageNumber="23">
Sand beach in Dajing County, Fujian Province, China,
<geoCoordinate id="1F618F53266A3211488AF70A06B9D654" degrees="26" direction="north" minutes="42" orientation="latitude" precision="15" seconds="34" value="26.709446">26°42'34&quot;N</geoCoordinate>
,
<geoCoordinate id="B76B78F0A27CBAFFD856AD59468519B5" degrees="120" direction="east" minutes="7" orientation="longitude" precision="15" seconds="17" value="120.12139">120°7'17&quot;E</geoCoordinate>
,
<emphasis id="9B5E33188B61F398AB9233689AD5598B" italics="true" pageId="0" pageNumber="23">leg.</emphasis>
Zhen Wang in May 2018
</paragraph>
</subSubSection>
<subSubSection id="2E63AAE36BB8AD4BABE7636ACEF4CDF0" pageId="0" pageNumber="23" type="etymology">
<paragraph id="0E092F6956D9D5A2347A31A24593D135" pageId="0" pageNumber="23">Etymology.</paragraph>
<paragraph id="91AA84CDD750DBC687B333F2373B0BBA" pageId="0" pageNumber="23">
The epithet &quot;
<taxonomicName id="881DB81A55E92F570CECCF05FCED2AA0" authorityName="HH Liu, Z Wang, YH Gao &amp; CP Chen" authorityYear="2022" class="Bacillariophyceae" family="Grammatophoraceae" genus="Ambo" kingdom="Chromista" lsidName="Ambo dajingensis" order="Rhabdonematales" pageId="0" pageNumber="23" phylum="Ochrophyta" rank="species" species="dajingensis">
<emphasis id="F2672E4A57AC762B2EC1C260D3E01C2A" italics="true" pageId="0" pageNumber="23">Ambo dajingensis</emphasis>
</taxonomicName>
&quot; refers to the site where this specimen was collected.
</paragraph>
</subSubSection>
<subSubSection id="A1292D090201224402A1378E692B2EFD" pageId="0" pageNumber="23" type="description">
<paragraph id="86C5C2DFA68B2B19732ECFF0EFB43789" pageId="0" pageNumber="23">Description.</paragraph>
<paragraph id="3E4E12BA09FD347362D1E6D6560A1F5B" pageId="0" pageNumber="23">
<emphasis id="F3816512EB5A821D8370700594911D37" bold="true" pageId="0" pageNumber="23">LM observations</emphasis>
(Fig.
<figureCitation id="16BA04AB7A8FEEFD81914E6552C31ABA" captionStart="Figure 2" captionStartId="F2" captionText="Figure 2. Light micrographs (LM) of Ambo dajingensis sp. nov. A-F valve showing the size and shape G-I girdle view. Scale bar: 5 µm." figureDoi="10.3897/phytokeys.210.90876.figure2" httpUri="https://binary.pensoft.net/fig/749971" pageId="0" pageNumber="23">2A-I</figureCitation>
): The cells are connected to each other to form short chains and they live in groups. The girdle is comprised of several plain and open bands. The valves are linear elliptic with two costae that are straight or slightly curved to the outside and protrude deeply into the valve. The valve is 6-10
<normalizedToken id="8F2BF1A183380F9B1E0C0146CC10BB48" originalValue="μm">μm</normalizedToken>
long and 2.4-3
<normalizedToken id="C47285DB4C5059E5C2E39E8E8ACB4024" originalValue="μm">μm</normalizedToken>
wide.
</paragraph>
<caption id="C813E8147D69E06FA276BFD7547C2CA1" doi="10.3897/phytokeys.210.90876.figure2" httpUri="https://binary.pensoft.net/fig/749971" pageId="0" pageNumber="23" start="Figure 2" startId="F2">
<paragraph id="A58AAEDB95A3944C6CD6D12523D57F23" pageId="0" pageNumber="23">
<emphasis id="10B267E78679BD938E78F149FACFDA04" bold="true" pageId="0" pageNumber="23">Figure 2.</emphasis>
Light micrographs (LM) of
<taxonomicName id="F6365BB9B95B760A1DE207C87E3AB9E1" authorityName="HH Liu, Z Wang, YH Gao &amp; CP Chen" authorityYear="2022" class="Bacillariophyceae" family="Grammatophoraceae" genus="Ambo" kingdom="Chromista" lsidName="Ambo dajingensis" order="Rhabdonematales" pageId="0" pageNumber="23" phylum="Ochrophyta" rank="species" species="dajingensis">
<emphasis id="0BDD4AD545A9759BBC92582C578B93F0" italics="true" pageId="0" pageNumber="23">Ambo dajingensis</emphasis>
</taxonomicName>
sp. nov.
<emphasis id="451B232EC92AF0460C7BFA468EB86B63" bold="true" pageId="0" pageNumber="23">A-F</emphasis>
valve showing the size and shape
<emphasis id="5380BE17DDA64EC4059FF0B4BBE8AFC6" bold="true" pageId="0" pageNumber="23">G-I</emphasis>
girdle view. Scale bar: 5
<normalizedToken id="9E5CF98BB351B0B0C20A054688F7A4D5" originalValue="µm">µm</normalizedToken>
.
</paragraph>
</caption>
<paragraph id="5D14D6F96E208F9340F4B61BD44CB7F1" pageId="0" pageNumber="23">
<emphasis id="F7F28D74FABF3B62A656FBCA15DCFC6C" bold="true" pageId="0" pageNumber="23">SEM observations</emphasis>
(Figs
<figureCitation id="C5CB2A00F2D81DC0242DD97BCA58B362" captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. Scanning electron microscopy (SEM) images of Ambo dajingensis sp. nov. in an external view of the entire valve A, B external valve view of the whole specimen. There is a hyaline valve face over most of the length and transapical striae develop only at the valve apex, with a weakly expressed sternum at the apices C, E, F fan-shaped spines (arrows) are arranged along the valve margin, there is striation, a strongly expressed sternum on the valve apical part, a small circular striated area structure on the mantle apex D the girdle bands. Scale bar: 1 µm." figureDoi="10.3897/phytokeys.210.90876.figure3" httpUri="https://binary.pensoft.net/fig/749972" pageId="0" pageNumber="23">3</figureCitation>
,
<figureCitation id="245FB56954DEF14165145B06EAC5EF03" captionStart="Figure 4" captionStartId="F4" captionText="Figure 4. Scanning electron microscopy (SEM) images of Ambo dajingensis sp. nov. in an internal view of the entire valve A, C internal valve view of the whole specimen B, D the presence of costae (arrows) and the areolation. Scale bars: 3 µm (A); 1 µm (B); 5 µm (C); 2 µm (D)." figureDoi="10.3897/phytokeys.210.90876.figure4" httpUri="https://binary.pensoft.net/fig/749973" pageId="0" pageNumber="23">4</figureCitation>
): Through the observation of the samples treated by the critical point drying method, the cells on the girdle band valve are rectangular (Fig.
<figureCitation id="8608010664CCC86F38597903CCA5D732" captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. Scanning electron microscopy (SEM) images of Ambo dajingensis sp. nov. in an external view of the entire valve A, B external valve view of the whole specimen. There is a hyaline valve face over most of the length and transapical striae develop only at the valve apex, with a weakly expressed sternum at the apices C, E, F fan-shaped spines (arrows) are arranged along the valve margin, there is striation, a strongly expressed sternum on the valve apical part, a small circular striated area structure on the mantle apex D the girdle bands. Scale bar: 1 µm." figureDoi="10.3897/phytokeys.210.90876.figure3" httpUri="https://binary.pensoft.net/fig/749972" pageId="0" pageNumber="23">3A</figureCitation>
), with a wrapped layer of membrane. Several girdle bands (Fig.
<figureCitation id="D30469D3C90542C34516FF2204EA874E" captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. Scanning electron microscopy (SEM) images of Ambo dajingensis sp. nov. in an external view of the entire valve A, B external valve view of the whole specimen. There is a hyaline valve face over most of the length and transapical striae develop only at the valve apex, with a weakly expressed sternum at the apices C, E, F fan-shaped spines (arrows) are arranged along the valve margin, there is striation, a strongly expressed sternum on the valve apical part, a small circular striated area structure on the mantle apex D the girdle bands. Scale bar: 1 µm." figureDoi="10.3897/phytokeys.210.90876.figure3" httpUri="https://binary.pensoft.net/fig/749972" pageId="0" pageNumber="23">3D</figureCitation>
) are connected between the epitheca and hypotheca valves. The girdle band has fine vertical lines (Fig.
<figureCitation id="F42FFBE8B7C18A2423C0B2456AD49A26" captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. Scanning electron microscopy (SEM) images of Ambo dajingensis sp. nov. in an external view of the entire valve A, B external valve view of the whole specimen. There is a hyaline valve face over most of the length and transapical striae develop only at the valve apex, with a weakly expressed sternum at the apices C, E, F fan-shaped spines (arrows) are arranged along the valve margin, there is striation, a strongly expressed sternum on the valve apical part, a small circular striated area structure on the mantle apex D the girdle bands. Scale bar: 1 µm." figureDoi="10.3897/phytokeys.210.90876.figure3" httpUri="https://binary.pensoft.net/fig/749972" pageId="0" pageNumber="23">3D</figureCitation>
) but no obvious spot pattern. Areolae can be observed at both ends of the valve, and the area of the areolae extends to the sternum, but there are no areolae or other cell structures in the middle of the cell (Fig.
<figureCitation id="305D1EEB416D6A93C6757FA46B59D78D" captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. Scanning electron microscopy (SEM) images of Ambo dajingensis sp. nov. in an external view of the entire valve A, B external valve view of the whole specimen. There is a hyaline valve face over most of the length and transapical striae develop only at the valve apex, with a weakly expressed sternum at the apices C, E, F fan-shaped spines (arrows) are arranged along the valve margin, there is striation, a strongly expressed sternum on the valve apical part, a small circular striated area structure on the mantle apex D the girdle bands. Scale bar: 1 µm." figureDoi="10.3897/phytokeys.210.90876.figure3" httpUri="https://binary.pensoft.net/fig/749972" pageId="0" pageNumber="23">3A, B</figureCitation>
). There is a circle of spines for cell connection at the edge of the valve (Fig.
<figureCitation id="55919F692E9C93192C679D84ABBDC806" captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. Scanning electron microscopy (SEM) images of Ambo dajingensis sp. nov. in an external view of the entire valve A, B external valve view of the whole specimen. There is a hyaline valve face over most of the length and transapical striae develop only at the valve apex, with a weakly expressed sternum at the apices C, E, F fan-shaped spines (arrows) are arranged along the valve margin, there is striation, a strongly expressed sternum on the valve apical part, a small circular striated area structure on the mantle apex D the girdle bands. Scale bar: 1 µm." figureDoi="10.3897/phytokeys.210.90876.figure3" httpUri="https://binary.pensoft.net/fig/749972" pageId="0" pageNumber="23">3A-D</figureCitation>
). The single row of slightly radial striae is distributed at both ends of the cell (Fig.
<figureCitation id="BFB0BC3E5A72341BB9294D5050712C80" captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. Scanning electron microscopy (SEM) images of Ambo dajingensis sp. nov. in an external view of the entire valve A, B external valve view of the whole specimen. There is a hyaline valve face over most of the length and transapical striae develop only at the valve apex, with a weakly expressed sternum at the apices C, E, F fan-shaped spines (arrows) are arranged along the valve margin, there is striation, a strongly expressed sternum on the valve apical part, a small circular striated area structure on the mantle apex D the girdle bands. Scale bar: 1 µm." figureDoi="10.3897/phytokeys.210.90876.figure3" httpUri="https://binary.pensoft.net/fig/749972" pageId="0" pageNumber="23">3A</figureCitation>
). Observation of the samples processed by the acidification method showed striae at both ends of the cells and a narrow sternum in the center of the cells in the area of striae, but the sterna were not obvious. To the two ends of the valve, the striae at both ends of the valve extended from the valve in a single row, and the number of striae was 50-60 in 10
<normalizedToken id="23634B4979CDCDF494919029AF9F9D17" originalValue="μm">μm</normalizedToken>
. The areolae on the valve are round, small, simple, and have no complex structure, such as a cribrum. A small circular area free of areolae is distinctly set off from the striae, and can be observed at the apical part of mantle area with several elongate areolae following the general pattern of the mantle (Fig.
<figureCitation id="2E7CDA7EECA2BC9A2CBA5E1A1B6E7929" captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. Scanning electron microscopy (SEM) images of Ambo dajingensis sp. nov. in an external view of the entire valve A, B external valve view of the whole specimen. There is a hyaline valve face over most of the length and transapical striae develop only at the valve apex, with a weakly expressed sternum at the apices C, E, F fan-shaped spines (arrows) are arranged along the valve margin, there is striation, a strongly expressed sternum on the valve apical part, a small circular striated area structure on the mantle apex D the girdle bands. Scale bar: 1 µm." figureDoi="10.3897/phytokeys.210.90876.figure3" httpUri="https://binary.pensoft.net/fig/749972" pageId="0" pageNumber="23">3E, F</figureCitation>
). On the edge of the valve, there is a row of densely distributed small spines.
</paragraph>
<caption id="FC17AC089017D3F94A3C669D94C646D8" doi="10.3897/phytokeys.210.90876.figure3" httpUri="https://binary.pensoft.net/fig/749972" pageId="0" pageNumber="23" start="Figure 3" startId="F3">
<paragraph id="04E7A58458666D112599A5CDFB917BBB" pageId="0" pageNumber="23">
<emphasis id="8CA5FE7B6F3E0D13B3AEFD7FBEEB5553" bold="true" pageId="0" pageNumber="23">Figure 3.</emphasis>
Scanning electron microscopy (SEM) images of
<taxonomicName id="6BA2CEB19D2FC0573967D4994A7ED5DD" authorityName="HH Liu, Z Wang, YH Gao &amp; CP Chen" authorityYear="2022" class="Bacillariophyceae" family="Grammatophoraceae" genus="Ambo" kingdom="Chromista" lsidName="Ambo dajingensis" order="Rhabdonematales" pageId="0" pageNumber="23" phylum="Ochrophyta" rank="species" species="dajingensis">
<emphasis id="50F4EE00F746CA16F73C45B1F7C59980" italics="true" pageId="0" pageNumber="23">Ambo dajingensis</emphasis>
</taxonomicName>
sp. nov. in an external view of the entire valve
<emphasis id="ACF2A3FAD8EBCD13E839C0519A5A2D35" bold="true" pageId="0" pageNumber="23">A, B</emphasis>
external valve view of the whole specimen. There is a hyaline valve face over most of the length and transapical striae develop only at the valve apex, with a weakly expressed sternum at the apices
<emphasis id="71B9C476961E36395E4B118F951BD2D6" bold="true" pageId="0" pageNumber="23">C, E, F</emphasis>
fan-shaped spines (arrows) are arranged along the valve margin, there is striation, a strongly expressed sternum on the valve apical part, a small circular striated area structure on the mantle apex
<emphasis id="E090687BE2B35D582E5316C0A0E7784B" bold="true" pageId="0" pageNumber="23">D</emphasis>
the girdle bands. Scale bar: 1
<normalizedToken id="05EC64A01F43B73F0A87BF3E2F752C63" originalValue="µm">µm</normalizedToken>
.
</paragraph>
</caption>
<caption id="F0FFAAF2119FC24528A6E01A940EFDA3" doi="10.3897/phytokeys.210.90876.figure4" httpUri="https://binary.pensoft.net/fig/749973" pageId="0" pageNumber="23" start="Figure 4" startId="F4">
<paragraph id="1EAF918FDC7C679DB05EF1269FD15179" pageId="0" pageNumber="23">
<emphasis id="80325C3D7A1DA4C0A1A9AC26CC09B1BB" bold="true" pageId="0" pageNumber="23">Figure 4.</emphasis>
Scanning electron microscopy (SEM) images of
<taxonomicName id="6E24F4398A6A9B00666A9FB0DD36B617" authorityName="HH Liu, Z Wang, YH Gao &amp; CP Chen" authorityYear="2022" class="Bacillariophyceae" family="Grammatophoraceae" genus="Ambo" kingdom="Chromista" lsidName="Ambo dajingensis" order="Rhabdonematales" pageId="0" pageNumber="23" phylum="Ochrophyta" rank="species" species="dajingensis">
<emphasis id="9FDB7185610BB5B31A8AA65C5BE13C79" italics="true" pageId="0" pageNumber="23">Ambo dajingensis</emphasis>
</taxonomicName>
sp. nov. in an internal view of the entire valve
<emphasis id="0AF76C8B2A44C771CCD63E473194186F" bold="true" pageId="0" pageNumber="23">A, C</emphasis>
internal valve view of the whole specimen
<emphasis id="25469231D3F5B79B8390D7705100CA21" bold="true" pageId="0" pageNumber="23">B, D</emphasis>
the presence of costae (arrows) and the areolation. Scale bars: 3
<normalizedToken id="A56A378F5420D98299A242A10929F58E" originalValue="µm">µm</normalizedToken>
(
<emphasis id="C4BFDBCC45E5D0BBA1D3C29C4C4877BF" bold="true" pageId="0" pageNumber="23">A</emphasis>
); 1
<normalizedToken id="16B5C092B29319E8D1C39A5EB58D6B2F" originalValue="µm">µm</normalizedToken>
(
<emphasis id="2E8DF51D32A1D7C859D4CA0AE54B3D10" bold="true" pageId="0" pageNumber="23">B</emphasis>
); 5
<normalizedToken id="19F7AA1668E37BA8B0C8ACEF716E4684" originalValue="µm">µm</normalizedToken>
(
<emphasis id="E93D2CD8D15A28612F397BD039BE9569" bold="true" pageId="0" pageNumber="23">C</emphasis>
); 2
<normalizedToken id="9CB64191932340088B639D20A70A039F" originalValue="µm">µm</normalizedToken>
(
<emphasis id="57B17AFF962C4B70753CDF89783CD12D" bold="true" pageId="0" pageNumber="23">D</emphasis>
).
</paragraph>
</caption>
<paragraph id="DA0916929827972FDF477468EE09AFD9" pageId="0" pageNumber="23">
Internally, the valves are divided into three sectors by robust costae (Fig.
<figureCitation id="349E8E63208F6D2F9338BBE0FD0904F5" captionStart="Figure 4" captionStartId="F4" captionText="Figure 4. Scanning electron microscopy (SEM) images of Ambo dajingensis sp. nov. in an internal view of the entire valve A, C internal valve view of the whole specimen B, D the presence of costae (arrows) and the areolation. Scale bars: 3 µm (A); 1 µm (B); 5 µm (C); 2 µm (D)." figureDoi="10.3897/phytokeys.210.90876.figure4" httpUri="https://binary.pensoft.net/fig/749973" pageId="0" pageNumber="23">4A, C</figureCitation>
). The interior of the valve face is flat, the transition from the valve face to the mantle is abrupt (Fig.
<figureCitation id="2D5463E728D4C87D20C8148337A3FF8D" captionStart="Figure 4" captionStartId="F4" captionText="Figure 4. Scanning electron microscopy (SEM) images of Ambo dajingensis sp. nov. in an internal view of the entire valve A, C internal valve view of the whole specimen B, D the presence of costae (arrows) and the areolation. Scale bars: 3 µm (A); 1 µm (B); 5 µm (C); 2 µm (D)." figureDoi="10.3897/phytokeys.210.90876.figure4" httpUri="https://binary.pensoft.net/fig/749973" pageId="0" pageNumber="23">4A</figureCitation>
). The transapical striae are composed internally of small, round areolae, and they are parallel in the middle to slightly radiate at the apices. The sternum is narrow and linear, set off by costae (Fig.
<figureCitation id="47DC5A2DDF495304FDC1CFD316A844FD" captionStart="Figure 4" captionStartId="F4" captionText="Figure 4. Scanning electron microscopy (SEM) images of Ambo dajingensis sp. nov. in an internal view of the entire valve A, C internal valve view of the whole specimen B, D the presence of costae (arrows) and the areolation. Scale bars: 3 µm (A); 1 µm (B); 5 µm (C); 2 µm (D)." figureDoi="10.3897/phytokeys.210.90876.figure4" httpUri="https://binary.pensoft.net/fig/749973" pageId="0" pageNumber="23">4A</figureCitation>
).
</paragraph>
</subSubSection>
<subSubSection id="8CAC24C9ED5EFC5B4AA3AE3C2051FBF2" pageId="0" pageNumber="23" type="distribution">
<paragraph id="B714B2DB56A1B3F87225DA787673F7E4" pageId="0" pageNumber="23">Distribution.</paragraph>
<paragraph id="C9C24F8426A40523C15AFCF29A1532C5" pageId="0" pageNumber="23">Marine, coastal. Collected from Dajing beach on sandy shores. Changchun Town, Xiapu, Ningde City, Fujian Province.</paragraph>
</subSubSection>
<subSubSection id="7BE900ACACD4B9D2844806E774F5A393" pageId="0" pageNumber="23" type="molecular phylogeny">
<paragraph id="2047D4C06340A50480C6B45BB0BBD010" pageId="0" pageNumber="23">Molecular phylogeny</paragraph>
<paragraph id="AA044FC33623EBDDA77B1B1FB5DB28DA" pageId="0" pageNumber="23">
Phylogenetic analysis of molecular data was conducted using a
<emphasis id="367BC500610BE14C7E39BC7DA46EDC99" italics="true" pageId="0" pageNumber="23">rbc</emphasis>
L-gene dataset. The tree inferred from Maximum-Likelihood Phylogenies (MLP) analysis (Fig.
<figureCitation id="A376EB3F62C39FCB45C46D26E8095251" captionStart="Figure 5" captionStartId="F5" captionText="Figure 5. Maximum-Likelihood Phylogenies tree. Maximum-Likelihood Phylogenies (MLP) tree (based on analysis of the rbc L dataset) of mediophycean strains related to Ambo." figureDoi="10.3897/phytokeys.210.90876.figure5" httpUri="https://binary.pensoft.net/fig/749974" pageId="0" pageNumber="23">5</figureCitation>
) of the concatenated
<emphasis id="FCCAB2D26C118FA940D6E776AAE4A6F4" italics="true" pageId="0" pageNumber="23">rbc</emphasis>
L-gene dataset recovered the genus
<taxonomicName id="27781954A47BE2CB5FDA6E1F409AB30C" class="Bacillariophyceae" family="Grammatophoraceae" genus="Ambo" kingdom="Chromista" lsidName="Ambo" order="Rhabdonematales" pageId="0" pageNumber="23" phylum="Ochrophyta" rank="genus">
<emphasis id="544B283F4FBD9DA58EBC9350F2CC33A0" italics="true" pageId="0" pageNumber="23">Ambo</emphasis>
</taxonomicName>
(represented by
<taxonomicName id="DEDA8745601BB824207E1F3E1CC7EF64" class="Bacillariophyceae" family="Grammatophoraceae" genus="Ambo" higherTaxonomySource="GBIF" kingdom="Chromista" lsidName="A. tenuissimus" order="Rhabdonematales" pageId="0" pageNumber="23" phylum="Ochrophyta" rank="species" species="tenuissimus">
<emphasis id="90012093C9A15B5D4D9C208B3DA27847" italics="true" pageId="0" pageNumber="23">A. tenuissimus</emphasis>
</taxonomicName>
,
<taxonomicName id="F5112E88458DB23105DE156049047651" authorityName="HH Liu, Z Wang, YH Gao &amp; CP Chen" authorityYear="2022" class="Bacillariophyceae" family="Grammatophoraceae" genus="Ambo" kingdom="Chromista" lsidName="Ambo dajingensis" order="Rhabdonematales" pageId="0" pageNumber="23" phylum="Ochrophyta" rank="species" species="dajingensis">
<emphasis id="0C6BD03AA46378F2AB221AE6B3292488" italics="true" pageId="0" pageNumber="23">Ambo dajingensis</emphasis>
</taxonomicName>
and
<taxonomicName id="F60A02606EA631A44CF286FA293D022A" class="Bacillariophyceae" family="Grammatophoraceae" genus="Ambo" higherTaxonomySource="GBIF" kingdom="Chromista" lsidName="A. gallaeciae" order="Rhabdonematales" pageId="0" pageNumber="23" phylum="Ochrophyta" rank="species" species="gallaeciae">
<emphasis id="0753A6F3470B3F019F362444749F95AE" italics="true" pageId="0" pageNumber="23">A. gallaeciae</emphasis>
</taxonomicName>
) within the araphid diatoms, sister (bootstrap support [bs] = 100%) to a clade with
<taxonomicName id="36EBF2B341E5B74D3E368DA80B641DE3" class="Magnoliopsida" family="Rhizophoraceae" genus="Diatoma" higherTaxonomySource="IPNI" kingdom="Plantae" lsidName="Diatoma moniliforma" order="Rhizophorales" pageId="0" pageNumber="23" phylum="Magnoliophyta" rank="species" species="moniliforma">
<emphasis id="4AE95A84FBF838A6529DAB201BA2FF87" italics="true" pageId="0" pageNumber="23">Diatoma moniliforma</emphasis>
</taxonomicName>
,
<taxonomicName id="D63DA0E4FE4ECFEED30925E3E26FAC3E" class="Magnoliopsida" family="Rhizophoraceae" genus="Diatoma" higherTaxonomySource="IPNI" kingdom="Plantae" lsidName="Diatoma tenue" order="Rhizophorales" pageId="0" pageNumber="23" phylum="Magnoliophyta" rank="species" species="tenue">
<emphasis id="194F2BFD438F593AF341B9F96CC6550B" italics="true" pageId="0" pageNumber="23">Diatoma tenue</emphasis>
</taxonomicName>
, and
<taxonomicName id="A03B42B895144A364D111694D8134362" class="Bacillariophyceae" family="Tabellariaceae" genus="Asterionella" higherTaxonomySource="GBIF" kingdom="Chromista" lsidName="Asterionella formosa" order="Rhabdonematales" pageId="0" pageNumber="23" phylum="Bacillariophyta" rank="species" species="formosa">
<emphasis id="60AD3F5EE3A3950CD769DFA2BB1972BE" italics="true" pageId="0" pageNumber="23">Asterionella formosa</emphasis>
</taxonomicName>
.
<taxonomicName id="84204241FC36F1BC6EBB6596E78C5D78" authorityName="HH Liu, Z Wang, YH Gao &amp; CP Chen" authorityYear="2022" class="Bacillariophyceae" family="Grammatophoraceae" genus="Ambo" kingdom="Chromista" lsidName="Ambo dajingensis" order="Rhabdonematales" pageId="0" pageNumber="23" phylum="Ochrophyta" rank="species" species="dajingensis">
<emphasis id="604110434FD25F1B21E5048434A47E00" italics="true" pageId="0" pageNumber="23">Ambo dajingensis</emphasis>
</taxonomicName>
and
<taxonomicName id="1A821AC97A234EF7D4A1D9430158DE3F" class="Bacillariophyceae" family="Grammatophoraceae" genus="Ambo" higherTaxonomySource="GBIF" kingdom="Chromista" lsidName="A. gallaeciae" order="Rhabdonematales" pageId="0" pageNumber="23" phylum="Ochrophyta" rank="species" species="gallaeciae">
<emphasis id="3E74838BEAEB8BCF6744ACF197EDF972" italics="true" pageId="0" pageNumber="23">A. gallaeciae</emphasis>
</taxonomicName>
were sister to a clade, but with low support. The phylogenetic relationships of the new species were sustained by genetic distance estimation. The sequences generated in the study were deposited in GenBank under access number OL457301.1.
</paragraph>
<caption id="BC9DF2BC6A5BEC38F00506FF38016DAF" doi="10.3897/phytokeys.210.90876.figure5" httpUri="https://binary.pensoft.net/fig/749974" pageId="0" pageNumber="23" start="Figure 5" startId="F5">
<paragraph id="0FEB1606A14C18B8D4052866D27A0E46" pageId="0" pageNumber="23">
<emphasis id="0B03F51A6C14F45BCAEDDA54ECF0FDF5" bold="true" pageId="0" pageNumber="23">Figure 5.</emphasis>
Maximum-Likelihood Phylogenies tree. Maximum-Likelihood Phylogenies (MLP) tree (based on analysis of the
<emphasis id="AD2354DFF6AEB560AA5346A1E1DC4071" italics="true" pageId="0" pageNumber="23">rbc</emphasis>
L dataset) of mediophycean strains related to
<taxonomicName id="ACA67293FB139FA6223C6EC075D7278A" class="Bacillariophyceae" family="Grammatophoraceae" genus="Ambo" kingdom="Chromista" lsidName="Ambo" order="Rhabdonematales" pageId="0" pageNumber="23" phylum="Ochrophyta" rank="genus">
<emphasis id="CF97A81E5C47594053C82DDA08538AA1" italics="true" pageId="0" pageNumber="23">Ambo</emphasis>
</taxonomicName>
.
</paragraph>
</caption>
</subSubSection>
</treatment>
</document>
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