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<document ID-DOI="10.11646/phytotaxa.593.1.1" ID-GBIF-Dataset="ef558f00-24a4-4671-bf56-df3c1d61ecd1" ID-ISSN="1179-3163" ID-Zenodo-Dep="7875089" IM.bibliography_approvedBy="tatiana" IM.illustrations_approvedBy="tatiana" IM.materialsCitations_approvedBy="tatiana" IM.metadata_approvedBy="tatiana" IM.tables_approvedBy="tatiana" IM.taxonomicNames_approvedBy="tatiana" IM.treatments_approvedBy="tatiana" checkinTime="1682061103176" checkinUser="plazi" docAuthor="Jovanovska, Elena, Wilson, Mallory C., Hamilton, Paul B. &amp; Stone, Jeffery" docDate="2023" docId="038487E2FFC3265FBCF1FF0ABC1175A0" docLanguage="en" docName="phytotaxa.593.1.1.pdf" docOrigin="Phytotaxa 593 (1)" docSource="http://dx.doi.org/10.11646/phytotaxa.593.1.1" docStyle="DocumentStyle:F08184CE06D8A97EA3E6DE35D99648B0.2:Phytotaxa.2014-.monograph" docStyleId="F08184CE06D8A97EA3E6DE35D99648B0" docStyleName="Phytotaxa.2014-.monograph" docStyleVersion="2" docTitle="Diploneis tumida Jovanovska &amp; Wilson &amp; Hamilton &amp; Stone 2023, sp. nov." docType="treatment" docVersion="4" lastPageNumber="30" masterDocId="FFBDFF9AFFDE2642BC79FF97B8647004" masterDocTitle="Morphological and molecular characterization of twenty-five new Diploneis species (Bacillariophyta) from Lake Tanganyika and its surrounding areas" masterLastPageNumber="102" masterPageNumber="1" pageNumber="30" updateTime="1683016984500" updateUser="tatiana">
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<mods:title>Morphological and molecular characterization of twenty-five new Diploneis species (Bacillariophyta) from Lake Tanganyika and its surrounding areas</mods:title>
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<mods:roleTerm>Author</mods:roleTerm>
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<mods:namePart>Jovanovska, Elena</mods:namePart>
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<mods:affiliation>Department of Paleoanthropology, Senckenberg Research Institute and Natural History Museum Frankfurt, Frankfurt, Germany &amp; jovanovska. eci @ gmail. com; https: // orcid. org / 0000 - 0002 - 3413 - 3683</mods:affiliation>
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<mods:namePart>Wilson, Mallory C.</mods:namePart>
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<mods:affiliation>Department of Paleoanthropology, Senckenberg Research Institute and Natural History Museum Frankfurt, Frankfurt, Germany &amp; Indiana State University, Indiana State University, Terre Haute, IN, USA &amp; mwilson 108 @ sycamores. indstate. edu; https: // orcid. org / 0000 - 0002 - 2852 - 125 X</mods:affiliation>
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<mods:namePart>Hamilton, Paul B.</mods:namePart>
<mods:nameIdentifier type="ORCID">0000-0001-6938-6341</mods:nameIdentifier>
<mods:affiliation>Phycology Section, Research and Collections Division, Canadian Museum of Nature, Ottawa, Canada &amp; phamilton @ nature. ca; https: // orcid. org / 0000 - 0001 - 6938 - 6341</mods:affiliation>
<mods:nameIdentifier type="email">phamilton@nature.ca</mods:nameIdentifier>
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<mods:roleTerm>Author</mods:roleTerm>
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<mods:namePart>Stone, Jeffery</mods:namePart>
<mods:nameIdentifier type="ORCID">0000-0002-1313-0643</mods:nameIdentifier>
<mods:affiliation>Department of Paleoanthropology, Senckenberg Research Institute and Natural History Museum Frankfurt, Frankfurt, Germany &amp; Indiana State University, Indiana State University, Terre Haute, IN, USA &amp; Department of Paleoanthropology, Senckenberg Research Institute and Natural History Museum Frankfurt, Frankfurt, Germany &amp; jeffery. stone @ indstate. edu; https: // orcid. org / 0000 - 0002 - 1313 - 0643 * Corresponding author &amp; Department of Paleoanthropology, Senckenberg Research Institute and Natural History Museum Frankfurt, Frankfurt, Germany</mods:affiliation>
<mods:nameIdentifier type="email">jeffery.stone@indstate.edu</mods:nameIdentifier>
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<mods:title>Phytotaxa</mods:title>
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<mods:date>2023</mods:date>
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<mods:number>2023-04-21</mods:number>
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<mods:number>593</mods:number>
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<treatment ID-DOI="http://doi.org/10.5281/zenodo.7875129" ID-Zenodo-Dep="7875129" LSID="urn:lsid:plazi:treatment:038487E2FFC3265FBCF1FF0ABC1175A0" httpUri="http://treatment.plazi.org/id/038487E2FFC3265FBCF1FF0ABC1175A0" lastPageNumber="30" pageId="29" pageNumber="30">
<subSubSection pageId="29" pageNumber="30" type="nomenclature">
<paragraph blockId="29.[136,885,157,185]" box="[136,885,157,185]" pageId="29" pageNumber="30">
<heading box="[136,885,157,185]" fontSize="11" level="2" pageId="29" pageNumber="30" reason="5">
<emphasis box="[136,426,157,184]" italics="true" pageId="29" pageNumber="30">
<taxonomicName authority="Jovanovska &amp; Wilson &amp; Hamilton &amp; Stone, 2023" authorityName="Jovanovska &amp; Wilson &amp; Hamilton &amp; Stone" authorityYear="2023" box="[136,335,157,184]" class="Bacillariophyceae" family="Naviculaceae" genus="Diploneis" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="29" pageNumber="30" phylum="Bacillariophyta" rank="species" species="tumida" status="sp. nov.">
<emphasis bold="true" box="[136,335,157,184]" italics="true" pageId="29" pageNumber="30">Diploneis tumida</emphasis>
</taxonomicName>
<taxonomicNameLabel box="[341,426,159,184]" pageId="29" pageNumber="30" rank="species">sp. nov.</taxonomicNameLabel>
</emphasis>
(LM
<figureCitation box="[491,647,158,185]" captionStart="FIGURES 108125" captionStartId="30.[136,243,1984,2006]" captionTargetBox="[151,1433,194,1958]" captionTargetId="figure-24@30.[150,1434,193,1960]" captionTargetPageId="30" captionText="FIGURES 108125. Diploneis tumida sp. nov., LM valve views, Lake Tanganyika. 108, 116125. Specimens from Ndole Bay. 109, 112115. Specimens from Mahale National Park. 110. Specimen from Kalambo Falls Lodge. 111. Specimen from Mutondwe Island. Fig. 109. Holotype specimen. Scale bar = 10 μm." figureDoi="http://doi.org/10.5281/zenodo.7875149" httpUri="https://zenodo.org/record/7875149/files/figure.png" pageId="29" pageNumber="30">Figs 108125</figureCitation>
, SEM
<figureCitation box="[723,878,158,184]" captionStart="FIGURES 126131" captionStartId="31.[136,243,1886,1908]" captionTargetBox="[228,1360,193,1859]" captionTargetId="figure-19@31.[226,1361,191,1860]" captionTargetPageId="31" captionText="FIGURES 126131. Diploneis tumida sp. nov., SEM external (Figs 126128) and internal (Figs 129131) valve views, Lake Tanganyika. 126. Specimen from Mutondwe Island. 127, 128. Specimen from Kiganza Bay. 129131. Specimen from Isanga Bay. 126. Whole valve. 127. Distal raphe ends with deflected terminal fissures and areolae opened in deep pits; note the inter-areolar fin-like silica ornamentations (white arrow). 128. Central area with extended teardrop shaped depression with proximal raphe ends. 129. Central area with slightly elevated proximal raphe ends and alveolate openings occluded by a thin silica layer. 130. View of a whole valve. 131. Distal raphe ends slightly elevated and distant from the valve apices. Scale bars = 10 μm (Fig. 130), 5 μm (Figs 126, 129, 131), 1 μm (Figs 127, 128)." figureDoi="http://doi.org/10.5281/zenodo.7875153" httpUri="https://zenodo.org/record/7875153/files/figure.png" pageId="29" pageNumber="30">Figs 126131</figureCitation>
)
</heading>
</paragraph>
<paragraph blockId="29.[136,1452,230,1444]" pageId="29" pageNumber="30">
Valves are weakly asymmetric, broadly lanceolate to rhombic-elliptic becoming elliptic-circular with smaller cell size (
<figureCitation box="[195,355,266,292]" captionStart-0="FIGURES 108125" captionStart-1="FIGURES 126131" captionStartId-0="30.[136,243,1984,2006]" captionStartId-1="31.[136,243,1886,1908]" captionTargetBox-0="[151,1433,194,1958]" captionTargetBox-1="[228,1360,193,1859]" captionTargetId-0="figure-24@30.[150,1434,193,1960]" captionTargetId-1="figure-19@31.[226,1361,191,1860]" captionTargetPageId-0="30" captionTargetPageId-1="31" captionText-0="FIGURES 108125. Diploneis tumida sp. nov., LM valve views, Lake Tanganyika. 108, 116125. Specimens from Ndole Bay. 109, 112115. Specimens from Mahale National Park. 110. Specimen from Kalambo Falls Lodge. 111. Specimen from Mutondwe Island. Fig. 109. Holotype specimen. Scale bar = 10 μm." captionText-1="FIGURES 126131. Diploneis tumida sp. nov., SEM external (Figs 126128) and internal (Figs 129131) valve views, Lake Tanganyika. 126. Specimen from Mutondwe Island. 127, 128. Specimen from Kiganza Bay. 129131. Specimen from Isanga Bay. 126. Whole valve. 127. Distal raphe ends with deflected terminal fissures and areolae opened in deep pits; note the inter-areolar fin-like silica ornamentations (white arrow). 128. Central area with extended teardrop shaped depression with proximal raphe ends. 129. Central area with slightly elevated proximal raphe ends and alveolate openings occluded by a thin silica layer. 130. View of a whole valve. 131. Distal raphe ends slightly elevated and distant from the valve apices. Scale bars = 10 μm (Fig. 130), 5 μm (Figs 126, 129, 131), 1 μm (Figs 127, 128)." figureDoi-0="http://doi.org/10.5281/zenodo.7875149" figureDoi-1="http://doi.org/10.5281/zenodo.7875153" httpUri-0="https://zenodo.org/record/7875149/files/figure.png" httpUri-1="https://zenodo.org/record/7875153/files/figure.png" pageId="29" pageNumber="30">Figs 108126</figureCitation>
). The length of the valve is 25.543 μm; and the width of the valve is 1623.5 μm. The axial area is narrow and slightly expanding into the lanceolate and slightly asymmetric central area (
<figureCitation box="[1156,1253,302,328]" captionStart="FIGURES 108125" captionStartId="30.[136,243,1984,2006]" captionTargetBox="[151,1433,194,1958]" captionTargetId="figure-24@30.[150,1434,193,1960]" captionTargetPageId="30" captionText="FIGURES 108125. Diploneis tumida sp. nov., LM valve views, Lake Tanganyika. 108, 116125. Specimens from Ndole Bay. 109, 112115. Specimens from Mahale National Park. 110. Specimen from Kalambo Falls Lodge. 111. Specimen from Mutondwe Island. Fig. 109. Holotype specimen. Scale bar = 10 μm." figureDoi="http://doi.org/10.5281/zenodo.7875149" httpUri="https://zenodo.org/record/7875149/files/figure.png" pageId="29" pageNumber="30">Fig. 110</figureCitation>
), 3.55 μm wide. Externally, the longitudinal canal is lanceolate, slightly expanded in the middle of the valve with two-three rows of cribrate (&lt;16 poroids) areolae narrowing into one at the valve apices (
<figureCitation box="[947,1106,374,401]" captionStart="FIGURES 108125" captionStartId="30.[136,243,1984,2006]" captionTargetBox="[151,1433,194,1958]" captionTargetId="figure-24@30.[150,1434,193,1960]" captionTargetPageId="30" captionText="FIGURES 108125. Diploneis tumida sp. nov., LM valve views, Lake Tanganyika. 108, 116125. Specimens from Ndole Bay. 109, 112115. Specimens from Mahale National Park. 110. Specimen from Kalambo Falls Lodge. 111. Specimen from Mutondwe Island. Fig. 109. Holotype specimen. Scale bar = 10 μm." figureDoi="http://doi.org/10.5281/zenodo.7875149" httpUri="https://zenodo.org/record/7875149/files/figure.png" pageId="29" pageNumber="30">Figs 108125</figureCitation>
,
<figureCitation box="[1121,1167,374,400]" captionStart="FIGURES 126131" captionStartId="31.[136,243,1886,1908]" captionTargetBox="[228,1360,193,1859]" captionTargetId="figure-19@31.[226,1361,191,1860]" captionTargetPageId="31" captionText="FIGURES 126131. Diploneis tumida sp. nov., SEM external (Figs 126128) and internal (Figs 129131) valve views, Lake Tanganyika. 126. Specimen from Mutondwe Island. 127, 128. Specimen from Kiganza Bay. 129131. Specimen from Isanga Bay. 126. Whole valve. 127. Distal raphe ends with deflected terminal fissures and areolae opened in deep pits; note the inter-areolar fin-like silica ornamentations (white arrow). 128. Central area with extended teardrop shaped depression with proximal raphe ends. 129. Central area with slightly elevated proximal raphe ends and alveolate openings occluded by a thin silica layer. 130. View of a whole valve. 131. Distal raphe ends slightly elevated and distant from the valve apices. Scale bars = 10 μm (Fig. 130), 5 μm (Figs 126, 129, 131), 1 μm (Figs 127, 128)." figureDoi="http://doi.org/10.5281/zenodo.7875153" httpUri="https://zenodo.org/record/7875153/files/figure.png" pageId="29" pageNumber="30">126</figureCitation>
). Internally, a thick non-porous slightly raised silica plate encloses the longitudinal canal (
<figureCitation box="[883,982,410,436]" captionStart="FIGURES 126131" captionStartId="31.[136,243,1886,1908]" captionTargetBox="[228,1360,193,1859]" captionTargetId="figure-19@31.[226,1361,191,1860]" captionTargetPageId="31" captionText="FIGURES 126131. Diploneis tumida sp. nov., SEM external (Figs 126128) and internal (Figs 129131) valve views, Lake Tanganyika. 126. Specimen from Mutondwe Island. 127, 128. Specimen from Kiganza Bay. 129131. Specimen from Isanga Bay. 126. Whole valve. 127. Distal raphe ends with deflected terminal fissures and areolae opened in deep pits; note the inter-areolar fin-like silica ornamentations (white arrow). 128. Central area with extended teardrop shaped depression with proximal raphe ends. 129. Central area with slightly elevated proximal raphe ends and alveolate openings occluded by a thin silica layer. 130. View of a whole valve. 131. Distal raphe ends slightly elevated and distant from the valve apices. Scale bars = 10 μm (Fig. 130), 5 μm (Figs 126, 129, 131), 1 μm (Figs 127, 128)." figureDoi="http://doi.org/10.5281/zenodo.7875153" httpUri="https://zenodo.org/record/7875153/files/figure.png" pageId="29" pageNumber="30">Fig. 130</figureCitation>
). Externally, the raphe is filiform, curved and positioned within an apically expanded depression; proximal ends simple or weakly bent to the same side of the valve (
<figureCitation box="[210,366,482,508]" captionStart="FIGURES 126131" captionStartId="31.[136,243,1886,1908]" captionTargetBox="[228,1360,193,1859]" captionTargetId="figure-19@31.[226,1361,191,1860]" captionTargetPageId="31" captionText="FIGURES 126131. Diploneis tumida sp. nov., SEM external (Figs 126128) and internal (Figs 129131) valve views, Lake Tanganyika. 126. Specimen from Mutondwe Island. 127, 128. Specimen from Kiganza Bay. 129131. Specimen from Isanga Bay. 126. Whole valve. 127. Distal raphe ends with deflected terminal fissures and areolae opened in deep pits; note the inter-areolar fin-like silica ornamentations (white arrow). 128. Central area with extended teardrop shaped depression with proximal raphe ends. 129. Central area with slightly elevated proximal raphe ends and alveolate openings occluded by a thin silica layer. 130. View of a whole valve. 131. Distal raphe ends slightly elevated and distant from the valve apices. Scale bars = 10 μm (Fig. 130), 5 μm (Figs 126, 129, 131), 1 μm (Figs 127, 128)." figureDoi="http://doi.org/10.5281/zenodo.7875153" httpUri="https://zenodo.org/record/7875153/files/figure.png" pageId="29" pageNumber="30">Figs 126, 128</figureCitation>
). The distal raphe ends are unilaterally bent to the same side and terminate at the valve face mantle junction (
<figureCitation box="[242,401,518,544]" captionStart="FIGURES 126131" captionStartId="31.[136,243,1886,1908]" captionTargetBox="[228,1360,193,1859]" captionTargetId="figure-19@31.[226,1361,191,1860]" captionTargetPageId="31" captionText="FIGURES 126131. Diploneis tumida sp. nov., SEM external (Figs 126128) and internal (Figs 129131) valve views, Lake Tanganyika. 126. Specimen from Mutondwe Island. 127, 128. Specimen from Kiganza Bay. 129131. Specimen from Isanga Bay. 126. Whole valve. 127. Distal raphe ends with deflected terminal fissures and areolae opened in deep pits; note the inter-areolar fin-like silica ornamentations (white arrow). 128. Central area with extended teardrop shaped depression with proximal raphe ends. 129. Central area with slightly elevated proximal raphe ends and alveolate openings occluded by a thin silica layer. 130. View of a whole valve. 131. Distal raphe ends slightly elevated and distant from the valve apices. Scale bars = 10 μm (Fig. 130), 5 μm (Figs 126, 129, 131), 1 μm (Figs 127, 128)." figureDoi="http://doi.org/10.5281/zenodo.7875153" httpUri="https://zenodo.org/record/7875153/files/figure.png" pageId="29" pageNumber="30">Figs 126, 127</figureCitation>
). Internally, the raphe is curved with simple proximal and distal ends that are slightly elevated in a depression formed by the longitudinal canal (
<figureCitation box="[687,844,554,580]" captionStart="FIGURES 126131" captionStartId="31.[136,243,1886,1908]" captionTargetBox="[228,1360,193,1859]" captionTargetId="figure-19@31.[226,1361,191,1860]" captionTargetPageId="31" captionText="FIGURES 126131. Diploneis tumida sp. nov., SEM external (Figs 126128) and internal (Figs 129131) valve views, Lake Tanganyika. 126. Specimen from Mutondwe Island. 127, 128. Specimen from Kiganza Bay. 129131. Specimen from Isanga Bay. 126. Whole valve. 127. Distal raphe ends with deflected terminal fissures and areolae opened in deep pits; note the inter-areolar fin-like silica ornamentations (white arrow). 128. Central area with extended teardrop shaped depression with proximal raphe ends. 129. Central area with slightly elevated proximal raphe ends and alveolate openings occluded by a thin silica layer. 130. View of a whole valve. 131. Distal raphe ends slightly elevated and distant from the valve apices. Scale bars = 10 μm (Fig. 130), 5 μm (Figs 126, 129, 131), 1 μm (Figs 127, 128)." figureDoi="http://doi.org/10.5281/zenodo.7875153" httpUri="https://zenodo.org/record/7875153/files/figure.png" pageId="29" pageNumber="30">Figs 129, 131</figureCitation>
). The striae are parallel at mid-valve becoming radiate towards the apices,
<quantity box="[356,441,590,616]" metricMagnitude="-1" metricUnit="m" metricValue="2.286" metricValueMax="2.54" metricValueMin="2.032" pageId="29" pageNumber="30" unit="in" value="9.0" valueMax="10.0" valueMin="8.0">810 in</quantity>
10 μm. Striae are uniseriate throughout (
<figureCitation box="[899,997,590,616]" captionStart="FIGURES 126131" captionStartId="31.[136,243,1886,1908]" captionTargetBox="[228,1360,193,1859]" captionTargetId="figure-19@31.[226,1361,191,1860]" captionTargetPageId="31" captionText="FIGURES 126131. Diploneis tumida sp. nov., SEM external (Figs 126128) and internal (Figs 129131) valve views, Lake Tanganyika. 126. Specimen from Mutondwe Island. 127, 128. Specimen from Kiganza Bay. 129131. Specimen from Isanga Bay. 126. Whole valve. 127. Distal raphe ends with deflected terminal fissures and areolae opened in deep pits; note the inter-areolar fin-like silica ornamentations (white arrow). 128. Central area with extended teardrop shaped depression with proximal raphe ends. 129. Central area with slightly elevated proximal raphe ends and alveolate openings occluded by a thin silica layer. 130. View of a whole valve. 131. Distal raphe ends slightly elevated and distant from the valve apices. Scale bars = 10 μm (Fig. 130), 5 μm (Figs 126, 129, 131), 1 μm (Figs 127, 128)." figureDoi="http://doi.org/10.5281/zenodo.7875153" httpUri="https://zenodo.org/record/7875153/files/figure.png" pageId="29" pageNumber="30">Fig. 126</figureCitation>
). The striae are composed of large round to rectangular areolae covered with cribra (&gt;45 poroids),
<quantity box="[768,866,626,653]" metricMagnitude="-1" metricUnit="m" metricValue="3.175" metricValueMax="3.81" metricValueMin="2.54" pageId="29" pageNumber="30" unit="in" value="12.5" valueMax="15.0" valueMin="10.0">1015 in</quantity>
10 μm. Externally, each areola forms a deep pit (
<figureCitation captionStart="FIGURES 126131" captionStartId="31.[136,243,1886,1908]" captionTargetBox="[228,1360,193,1859]" captionTargetId="figure-19@31.[226,1361,191,1860]" captionTargetPageId="31" captionText="FIGURES 126131. Diploneis tumida sp. nov., SEM external (Figs 126128) and internal (Figs 129131) valve views, Lake Tanganyika. 126. Specimen from Mutondwe Island. 127, 128. Specimen from Kiganza Bay. 129131. Specimen from Isanga Bay. 126. Whole valve. 127. Distal raphe ends with deflected terminal fissures and areolae opened in deep pits; note the inter-areolar fin-like silica ornamentations (white arrow). 128. Central area with extended teardrop shaped depression with proximal raphe ends. 129. Central area with slightly elevated proximal raphe ends and alveolate openings occluded by a thin silica layer. 130. View of a whole valve. 131. Distal raphe ends slightly elevated and distant from the valve apices. Scale bars = 10 μm (Fig. 130), 5 μm (Figs 126, 129, 131), 1 μm (Figs 127, 128)." figureDoi="http://doi.org/10.5281/zenodo.7875153" httpUri="https://zenodo.org/record/7875153/files/figure.png" pageId="29" pageNumber="30">Fig. 126</figureCitation>
). The inter-areolar thickenings have fin-like crest silica ornamentations, which are serrated with ca. 35 notched edges (white arrow in
<figureCitation box="[394,494,698,724]" captionStart="FIGURES 126131" captionStartId="31.[136,243,1886,1908]" captionTargetBox="[228,1360,193,1859]" captionTargetId="figure-19@31.[226,1361,191,1860]" captionTargetPageId="31" captionText="FIGURES 126131. Diploneis tumida sp. nov., SEM external (Figs 126128) and internal (Figs 129131) valve views, Lake Tanganyika. 126. Specimen from Mutondwe Island. 127, 128. Specimen from Kiganza Bay. 129131. Specimen from Isanga Bay. 126. Whole valve. 127. Distal raphe ends with deflected terminal fissures and areolae opened in deep pits; note the inter-areolar fin-like silica ornamentations (white arrow). 128. Central area with extended teardrop shaped depression with proximal raphe ends. 129. Central area with slightly elevated proximal raphe ends and alveolate openings occluded by a thin silica layer. 130. View of a whole valve. 131. Distal raphe ends slightly elevated and distant from the valve apices. Scale bars = 10 μm (Fig. 130), 5 μm (Figs 126, 129, 131), 1 μm (Figs 127, 128)." figureDoi="http://doi.org/10.5281/zenodo.7875153" httpUri="https://zenodo.org/record/7875153/files/figure.png" pageId="29" pageNumber="30">Fig. 127</figureCitation>
). The fin-like ridge crests over the canal are slightly bent into semi-circular shapes, positioned towards the striae whereas those associated with the striae are only slightly bent towards the canal (
<figureCitation captionStart="FIGURES 126131" captionStartId="31.[136,243,1886,1908]" captionTargetBox="[228,1360,193,1859]" captionTargetId="figure-19@31.[226,1361,191,1860]" captionTargetPageId="31" captionText="FIGURES 126131. Diploneis tumida sp. nov., SEM external (Figs 126128) and internal (Figs 129131) valve views, Lake Tanganyika. 126. Specimen from Mutondwe Island. 127, 128. Specimen from Kiganza Bay. 129131. Specimen from Isanga Bay. 126. Whole valve. 127. Distal raphe ends with deflected terminal fissures and areolae opened in deep pits; note the inter-areolar fin-like silica ornamentations (white arrow). 128. Central area with extended teardrop shaped depression with proximal raphe ends. 129. Central area with slightly elevated proximal raphe ends and alveolate openings occluded by a thin silica layer. 130. View of a whole valve. 131. Distal raphe ends slightly elevated and distant from the valve apices. Scale bars = 10 μm (Fig. 130), 5 μm (Figs 126, 129, 131), 1 μm (Figs 127, 128)." figureDoi="http://doi.org/10.5281/zenodo.7875153" httpUri="https://zenodo.org/record/7875153/files/figure.png" pageId="29" pageNumber="30">Figs 126, 128</figureCitation>
). The areolae increase in size towards the valve margins (
<figureCitation box="[892,992,770,796]" captionStart="FIGURES 126131" captionStartId="31.[136,243,1886,1908]" captionTargetBox="[228,1360,193,1859]" captionTargetId="figure-19@31.[226,1361,191,1860]" captionTargetPageId="31" captionText="FIGURES 126131. Diploneis tumida sp. nov., SEM external (Figs 126128) and internal (Figs 129131) valve views, Lake Tanganyika. 126. Specimen from Mutondwe Island. 127, 128. Specimen from Kiganza Bay. 129131. Specimen from Isanga Bay. 126. Whole valve. 127. Distal raphe ends with deflected terminal fissures and areolae opened in deep pits; note the inter-areolar fin-like silica ornamentations (white arrow). 128. Central area with extended teardrop shaped depression with proximal raphe ends. 129. Central area with slightly elevated proximal raphe ends and alveolate openings occluded by a thin silica layer. 130. View of a whole valve. 131. Distal raphe ends slightly elevated and distant from the valve apices. Scale bars = 10 μm (Fig. 130), 5 μm (Figs 126, 129, 131), 1 μm (Figs 127, 128)." figureDoi="http://doi.org/10.5281/zenodo.7875153" httpUri="https://zenodo.org/record/7875153/files/figure.png" pageId="29" pageNumber="30">Fig. 126</figureCitation>
). Internally, the alveoli open via a single elongated opening covered with a thin silica layer (
<figureCitation box="[708,866,806,832]" captionStart="FIGURES 126131" captionStartId="31.[136,243,1886,1908]" captionTargetBox="[228,1360,193,1859]" captionTargetId="figure-19@31.[226,1361,191,1860]" captionTargetPageId="31" captionText="FIGURES 126131. Diploneis tumida sp. nov., SEM external (Figs 126128) and internal (Figs 129131) valve views, Lake Tanganyika. 126. Specimen from Mutondwe Island. 127, 128. Specimen from Kiganza Bay. 129131. Specimen from Isanga Bay. 126. Whole valve. 127. Distal raphe ends with deflected terminal fissures and areolae opened in deep pits; note the inter-areolar fin-like silica ornamentations (white arrow). 128. Central area with extended teardrop shaped depression with proximal raphe ends. 129. Central area with slightly elevated proximal raphe ends and alveolate openings occluded by a thin silica layer. 130. View of a whole valve. 131. Distal raphe ends slightly elevated and distant from the valve apices. Scale bars = 10 μm (Fig. 130), 5 μm (Figs 126, 129, 131), 1 μm (Figs 127, 128)." figureDoi="http://doi.org/10.5281/zenodo.7875153" httpUri="https://zenodo.org/record/7875153/files/figure.png" pageId="29" pageNumber="30">Figs 129, 131</figureCitation>
).
</paragraph>
</subSubSection>
<subSubSection pageId="29" pageNumber="30" type="materials_examined">
<paragraph blockId="29.[136,1452,230,1444]" pageId="29" pageNumber="30">
<emphasis bold="true" box="[189,286,842,868]" pageId="29" pageNumber="30">Type:—</emphasis>
<materialsCitation collectingDate="2019-06-28" collectionCode="SCUBA" collectorName="W. Salzburger" country="Tanzania" elevation="782" latitude="-6.173639" location="Lake Tanganyika" longLatPrecision="1" longitude="29.740334" municipality="Mahale National Park" pageId="29" pageNumber="30" specimenCode="BM-108989" specimenCount="1" typeStatus="holotype">
<collectingCountry box="[285,734,842,868]" name="Tanzania" pageId="29" pageNumber="30">UNITED REPUBLIC OF TANZANIA</collectingCountry>
,
<location LSID="urn:lsid:plazi:treatment:038487E2FFC3265FBCF1FF0ABC1175A0:8EF2602FFFC3265FBE95FCDDBBD67360" box="[748,946,842,868]" country="Tanzania" latitude="-6.173639" longLatPrecision="1" longitude="29.740334" municipality="Mahale National Park" name="Lake Tanganyika" pageId="29" pageNumber="30">Lake Tanganyika</location>
,
<collectingMunicipality box="[960,1214,842,868]" pageId="29" pageNumber="30">Mahale National Park</collectingMunicipality>
, at
<quantity box="[1258,1332,842,868]" metricMagnitude="2" metricUnit="m" metricValue="7.82" pageId="29" pageNumber="30" unit="m" value="782.0">
<elevation box="[1258,1332,842,868]" metricMagnitude="2" metricUnit="m" metricValue="7.82" pageId="29" pageNumber="30" unit="m" value="782.0">782 m</elevation>
</quantity>
elevation; sand,
<quantity box="[200,255,878,905]" metricMagnitude="1" metricUnit="m" metricValue="2.5" pageId="29" pageNumber="30" unit="m" value="25.0">
<elevation box="[200,255,878,905]" metricMagnitude="1" metricUnit="m" metricValue="2.5" pageId="29" pageNumber="30" unit="m" value="25.0">25 m</elevation>
</quantity>
water depth, collected
<collectionCode box="[509,601,878,904]" pageId="29" pageNumber="30">SCUBA</collectionCode>
diving,
<geoCoordinate box="[690,836,878,905]" degrees="6" direction="south" minutes="10" orientation="latitude" pageId="29" pageNumber="30" precision="1" seconds="25.1" value="-6.173639">6°1025.1” S</geoCoordinate>
<geoCoordinate box="[841,1003,878,905]" degrees="29" direction="east" minutes="44" orientation="longitude" pageId="29" pageNumber="30" precision="1" seconds="25.2" value="29.740334">29°4425.2” E</geoCoordinate>
,
<emphasis box="[1014,1339,877,904]" italics="true" pageId="29" pageNumber="30">
<collectorName box="[1014,1169,878,904]" pageId="29" pageNumber="30">W. Salzburger</collectorName>
,
<date box="[1178,1206,878,904]" pageId="29" pageNumber="30" value="2019-06-28">
<collectingDate box="[1178,1206,878,904]" pageId="29" pageNumber="30" value="2019-06-28">28</collectingDate>
</date>
<superScript attach="left" box="[1206,1219,877,891]" fontSize="6" pageId="29" pageNumber="30">th</superScript>
June 2019
</emphasis>
(
<typeStatus box="[1352,1452,878,904]" pageId="29" pageNumber="30">holotype</typeStatus>
designated here, circled specimen BM-108989! =
<figureCitation box="[686,779,914,940]" captionStart="FIGURES 108125" captionStartId="30.[136,243,1984,2006]" captionTargetBox="[151,1433,194,1958]" captionTargetId="figure-24@30.[150,1434,193,1960]" captionTargetPageId="30" captionText="FIGURES 108125. Diploneis tumida sp. nov., LM valve views, Lake Tanganyika. 108, 116125. Specimens from Ndole Bay. 109, 112115. Specimens from Mahale National Park. 110. Specimen from Kalambo Falls Lodge. 111. Specimen from Mutondwe Island. Fig. 109. Holotype specimen. Scale bar = 10 μm." figureDoi="http://doi.org/10.5281/zenodo.7875149" httpUri="https://zenodo.org/record/7875149/files/figure.png" pageId="29" pageNumber="30">Fig. 109</figureCitation>
,
</materialsCitation>
<materialsCitation collectingDate="2019-06-28" collectionCode="SCUBA" collectorName="W. Salzburger" country="Tanzania" elevation="782" latitude="-6.173639" location="Lake Tanganyika" longLatPrecision="1" longitude="29.740334" municipality="Mahale National Park" pageId="29" pageNumber="30" specimenCode="ANSP-GC17218" specimenCount="1" typeStatus="isotype">
isotypes
<specimenCode box="[885,1084,914,940]" collectionCode="ANSP-GC" pageId="29" pageNumber="30">ANSP-GC17218</specimenCode>
!, CANA-129318!). Type material CANA-129318. Registration: http://phycobank.org/103721
</materialsCitation>
</paragraph>
<paragraph blockId="29.[136,1452,230,1444]" box="[189,1197,985,1012]" pageId="29" pageNumber="30">
<emphasis bold="true" box="[189,615,985,1012]" pageId="29" pageNumber="30">Pictures of the isolated specimen:—</emphasis>
LM micrograph on 1000× magnification (
<figureCitation box="[1085,1184,986,1012]" captionStart="FIGURES 211" captionStartId="8.[136,243,1955,1977]" captionTargetBox="[203,1382,194,1930]" captionTargetId="figure-23@8.[201,1383,193,1932]" captionTargetPageId="8" captionText="FIGURES 211. Diploneis salzburgeri sp. nov., LM valve views, Lake Tanganyika. 2, 3, 5, 6, 9. Specimens from southern parts of Lake Tanganyika, Kalambo Falls Lodge. 4. Specimen from Kalya Bay. 7. Specimen from Ndole Bay. 8. Specimen from Jakobsen Beach, near Kigoma. 10, 11. Specimens from Buhingu Island. Fig. 7. Holotype specimen. Scale bar = 10 μm." figureDoi="http://doi.org/10.5281/zenodo.7875095" httpUri="https://zenodo.org/record/7875095/files/figure.png" pageId="29" pageNumber="30">Fig. S3x</figureCitation>
).
</paragraph>
<paragraph blockId="29.[136,1452,230,1444]" box="[189,1097,1021,1048]" pageId="29" pageNumber="30">
<emphasis bold="true" box="[189,399,1021,1048]" pageId="29" pageNumber="30">Sequence data:—</emphasis>
Plastid gene
<emphasis box="[542,579,1022,1048]" italics="true" pageId="29" pageNumber="30">rbc</emphasis>
L sequence (GenBank accession:
<collectionCode box="[956,998,1022,1048]" pageId="29" pageNumber="30">OQ</collectionCode>
660278).
</paragraph>
</subSubSection>
<subSubSection box="[189,1217,1058,1084]" pageId="29" pageNumber="30" type="etymology">
<paragraph blockId="29.[136,1452,230,1444]" box="[189,1217,1058,1084]" pageId="29" pageNumber="30">
<emphasis bold="true" box="[189,356,1058,1084]" pageId="29" pageNumber="30">Etymology:—</emphasis>
The specific epithet
<taxonomicName authorityName="Jovanovska &amp; Wilson &amp; Hamilton &amp; Stone" authorityYear="2023" box="[593,671,1058,1084]" class="Bacillariophyceae" family="Naviculaceae" genus="Diploneis" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="29" pageNumber="30" phylum="Bacillariophyta" rank="species" species="tumida">
<emphasis box="[593,671,1058,1084]" italics="true" pageId="29" pageNumber="30">tumida</emphasis>
</taxonomicName>
refers the relatively broad width of this species.
</paragraph>
</subSubSection>
<subSubSection pageId="29" pageNumber="30" type="biology_ecology">
<paragraph blockId="29.[136,1452,230,1444]" pageId="29" pageNumber="30">
<emphasis bold="true" box="[189,522,1093,1120]" pageId="29" pageNumber="30">Ecology and distribution:—</emphasis>
<emphasis box="[522,800,1094,1120]" italics="true" pageId="29" pageNumber="30">
<taxonomicName authority="Jovanovska &amp; Wilson &amp; Hamilton &amp; Stone, 2023" authorityName="Jovanovska &amp; Wilson &amp; Hamilton &amp; Stone" authorityYear="2023" box="[522,715,1094,1120]" class="Bacillariophyceae" family="Naviculaceae" genus="Diploneis" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="29" pageNumber="30" phylum="Bacillariophyta" rank="species" species="tumida" status="sp. nov">Diploneis tumida</taxonomicName>
<taxonomicNameLabel box="[721,800,1095,1120]" pageId="29" pageNumber="30" rank="species">sp. nov</taxonomicNameLabel>
</emphasis>
has only been observed along the Tanzanian and Zambian coasts of Lake Tanganyika. In the alkaline, moderately mineral-rich and highly transparent waters, the species normally inhabits muddy and sandy (sometimes with mollusk shells) substrates between 9 and
<quantity box="[1081,1137,1166,1192]" metricMagnitude="1" metricUnit="m" metricValue="3.3" pageId="29" pageNumber="30" unit="m" value="33.0">33 m</quantity>
water depth in the southern, central, and northern sub-basins. The population size is moderate in Mahale National Park and Ndole Bay, while it is smaller on Mutondwe Island, Isanga Bay, Kalambo Falls Lodge, Kalya Bay, and Kiganza Bay near Gombe National Park (see
<figureCitation box="[252,360,1274,1300]" captionStart="FIGURE 1" captionStartId="3.[136,229,1594,1616]" captionTargetBox="[171,1421,879,1532]" captionTargetId="figure-263@3.[151,1436,844,1567]" captionTargetPageId="3" captionText="FIGURE 1. Maps ofAfrica with major drainage systems. a) Map of Africa indicating the general location of the East African Rift (framed in bold grey lines). b) Map of East African Rift with sample (purple circles) and type (green circles) localities for all twenty-five new Diploneis species. c) Bathymetric map of the three sub-basins of Lake Tanganyika with close-up of sampling sites in the lake. d) Key sampling sites in the northern Kigoma sub-basin of Lake Tanganyika. e) Key sampling sites in the central Kundwe sub-basin of Lake Tanganyika. f) Key sampling sites in the southern Kipili sub-basin of Lake Tanganyika. Location details for each species are given in the descriptions." figureDoi="http://doi.org/10.5281/zenodo.7875093" httpUri="https://zenodo.org/record/7875093/files/figure.png" pageId="29" pageNumber="30">Fig. 1cf</figureCitation>
). The species usually occurs together with
<emphasis box="[860,1121,1274,1300]" italics="true" pageId="29" pageNumber="30">
<taxonomicName authority="Jovanovska &amp; Wilson &amp; Hamilton &amp; Stone, 2023" authorityName="Jovanovska &amp; Wilson &amp; Hamilton &amp; Stone" authorityYear="2023" box="[860,1024,1274,1300]" class="Bacillariophyceae" family="Naviculaceae" genus="Diploneis" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="29" pageNumber="30" phylum="Bacillariophyta" rank="species" species="salzburgeri" status="sp. nov.">D. salzburgeri</taxonomicName>
<taxonomicNameLabel box="[1033,1121,1275,1300]" pageId="29" pageNumber="30" rank="species">sp. nov.</taxonomicNameLabel>
</emphasis>
,
<emphasis box="[1137,1408,1275,1300]" italics="true" pageId="29" pageNumber="30">
<taxonomicName authority="Jovanovska &amp; Wilson &amp; Hamilton &amp; Stone, 2023" authorityName="Jovanovska &amp; Wilson &amp; Hamilton &amp; Stone" authorityYear="2023" box="[1137,1311,1275,1300]" class="Bacillariophyceae" family="Naviculaceae" genus="Diploneis" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="29" pageNumber="30" phylum="Bacillariophyta" rank="species" species="cocquytiana" status="sp. nov.">D. cocquytiana</taxonomicName>
<taxonomicNameLabel box="[1320,1408,1275,1300]" pageId="29" pageNumber="30" rank="species">sp. nov.</taxonomicNameLabel>
</emphasis>
,
<emphasis italics="true" pageId="29" pageNumber="30">
<taxonomicName authority="Jovanovska &amp; Wilson &amp; Hamilton &amp; Stone, 2023" authorityName="Jovanovska &amp; Wilson &amp; Hamilton &amp; Stone" authorityYear="2023" class="Bacillariophyceae" family="Naviculaceae" genus="Diploneis" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="29" pageNumber="30" phylum="Bacillariophyta" rank="species" species="serrulata" status="sp. nov.">D. serrulata</taxonomicName>
<taxonomicNameLabel box="[246,331,1311,1336]" pageId="29" pageNumber="30" rank="species">sp. nov.</taxonomicNameLabel>
</emphasis>
,
<emphasis box="[344,568,1311,1336]" italics="true" pageId="29" pageNumber="30">
<taxonomicName authority="Jovanovska &amp; Wilson &amp; Hamilton &amp; Stone, 2023" authorityName="Jovanovska &amp; Wilson &amp; Hamilton &amp; Stone" authorityYear="2023" box="[344,476,1311,1336]" class="Bacillariophyceae" family="Naviculaceae" genus="Diploneis" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="29" pageNumber="30" phylum="Bacillariophyta" rank="species" species="gigantea" status="sp. nov.">D. gigantea</taxonomicName>
<taxonomicNameLabel box="[483,568,1311,1336]" pageId="29" pageNumber="30" rank="species">sp. nov.</taxonomicNameLabel>
</emphasis>
,
<emphasis box="[581,834,1310,1336]" italics="true" pageId="29" pageNumber="30">
<taxonomicName authority="Jovanovska &amp; Wilson &amp; Hamilton &amp; Stone, 2023" authorityName="Jovanovska &amp; Wilson &amp; Hamilton &amp; Stone" authorityYear="2023" box="[581,742,1310,1336]" class="Bacillariophyceae" family="Naviculaceae" genus="Diploneis" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="29" pageNumber="30" phylum="Bacillariophyta" rank="species" species="kilhamiana" status="sp. nov.">D. kilhamiana</taxonomicName>
<taxonomicNameLabel box="[749,834,1311,1336]" pageId="29" pageNumber="30" rank="species">sp. nov.</taxonomicNameLabel>
</emphasis>
,
<emphasis box="[847,1062,1311,1336]" italics="true" pageId="29" pageNumber="30">
<taxonomicName authority="Jovanovska &amp; Wilson &amp; Hamilton &amp; Stone, 2023" authorityName="Jovanovska &amp; Wilson &amp; Hamilton &amp; Stone" authorityYear="2023" box="[847,970,1311,1336]" class="Bacillariophyceae" family="Naviculaceae" genus="Diploneis" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="29" pageNumber="30" phylum="Bacillariophyta" rank="species" species="angusta" status="sp. nov.">D. angusta</taxonomicName>
<taxonomicNameLabel box="[977,1062,1311,1336]" pageId="29" pageNumber="30" rank="species">sp. nov.</taxonomicNameLabel>
</emphasis>
, and
<emphasis box="[1122,1334,1311,1336]" italics="true" pageId="29" pageNumber="30">
<taxonomicName authority="Jovanovska &amp; Wilson &amp; Hamilton &amp; Stone, 2023" authorityName="Jovanovska &amp; Wilson &amp; Hamilton &amp; Stone" authorityYear="2023" box="[1122,1243,1311,1336]" class="Bacillariophyceae" family="Naviculaceae" genus="Diploneis" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="29" pageNumber="30" phylum="Bacillariophyta" rank="species" species="cristata" status="sp. nov.">D. cristata</taxonomicName>
<taxonomicNameLabel box="[1249,1334,1311,1336]" pageId="29" pageNumber="30" rank="species">sp. nov.</taxonomicNameLabel>
</emphasis>
</paragraph>
<paragraph blockId="29.[136,1452,230,1444]" pageId="29" pageNumber="30">
<emphasis bold="true" box="[189,566,1345,1372]" pageId="29" pageNumber="30">Main differential characters:—</emphasis>
Valve shape, striae pattern, striae density, and external fin-like ornamentations across the valve.
</paragraph>
<paragraph blockId="29.[136,1452,230,1444]" box="[189,1141,1417,1444]" pageId="29" pageNumber="30">
<emphasis bold="true" box="[189,404,1417,1443]" pageId="29" pageNumber="30">Similar species:—</emphasis>
<emphasis box="[404,723,1418,1444]" italics="true" pageId="29" pageNumber="30">
<taxonomicName authority="Jovanovska &amp; Wilson &amp; Hamilton &amp; Stone, 2023" authorityName="Jovanovska &amp; Wilson &amp; Hamilton &amp; Stone" authorityYear="2023" box="[404,630,1418,1444]" class="Bacillariophyceae" family="Naviculaceae" genus="Diploneis" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="29" pageNumber="30" phylum="Bacillariophyta" rank="species" species="latiuscula" status="sp. nov.">Diploneis latiuscula</taxonomicName>
<taxonomicNameLabel box="[638,723,1419,1444]" pageId="29" pageNumber="30" rank="species">sp. nov.</taxonomicNameLabel>
</emphasis>
,
<emphasis box="[736,948,1419,1444]" italics="true" pageId="29" pageNumber="30">
<taxonomicName authority="Jovanovska &amp; Wilson &amp; Hamilton &amp; Stone, 2023" authorityName="Jovanovska &amp; Wilson &amp; Hamilton &amp; Stone" authorityYear="2023" box="[736,856,1419,1444]" class="Bacillariophyceae" family="Naviculaceae" genus="Diploneis" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="29" pageNumber="30" phylum="Bacillariophyta" rank="species" species="cristata" status="sp. nov.">D. cristata</taxonomicName>
<taxonomicNameLabel box="[863,948,1419,1444]" pageId="29" pageNumber="30" rank="species">sp. nov.</taxonomicNameLabel>
</emphasis>
, and
<taxonomicName authorityName="Cleve" authorityYear="1894" baseAuthorityName="Kutzing" box="[1008,1135,1418,1444]" class="Bacillariophyceae" family="Naviculaceae" genus="Diploneis" higherTaxonomySource="GBIF" kingdom="Chromista" order="Naviculales" pageId="29" pageNumber="30" phylum="Bacillariophyta" rank="species" species="elliptica">
<emphasis box="[1008,1135,1418,1444]" italics="true" pageId="29" pageNumber="30">D. elliptica</emphasis>
</taxonomicName>
.
</paragraph>
</subSubSection>
</treatment>
</document>