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<document id="FB884C0442B98F4AB6F99E444874B16D" ID-DOI="10.3897/evolsyst.8.139468" ID-ZooBank="4D0ADC1E-13E8-404E-A10A-E28C371EBC96" ID-publisher-id="139468" URI-arpha="DC7DA357-646A-5DAF-A23F-7A75DDB76045" URI-zoobank="http://zoobank.org/4D0ADC1E-13E8-404E-A10A-E28C371EBC96" article-type="research-article" checkinTime="1734621711582" checkinUser="pensoft" docAuthor="Diez, Yander L. &amp; Schmidt-Rhaesa, Andreas" docDate="2024" docId="7E99A86DF6EC5F929059E6C76CE50A53" docLanguage="en" docName="Evolutionary Systematics 8(2): 279-310" docOrigin="Evolutionary Systematics 8 (2)" docSource="https://evolsyst.pensoft.net/article/139468/download/xml/" docStyle="DocumentStyle:PensoftTaxPub.0000.journal_article.generic" docStyleName="PensoftTaxPub.0000.journal_article.generic" docTitle="Polycelis tenuis Ijima 1884" docType="treatment" docVersion="1" dtd-version="3.0" lastPageNumber="310" masterDocId="DC7DA357646A5DAFA23F7A75DDB76045" masterDocTitle="Little neighbours in Hamburg: free-living aquatic flatworms (Platyhelminthes)" masterLastPageNumber="310" masterPageNumber="279" pageNumber="279" updateTime="1734621836668" updateUser="pensoft">
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<mods:title id="0ADD3BBF4312EBE4798AEA454428F6A1">Little neighbours in Hamburg: free-living aquatic flatworms (Platyhelminthes)</mods:title>
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<mods:namePart id="99AE2C45D057D233C6AF4E68E44F968F">Diez, Yander L.</mods:namePart>
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<mods:affiliation id="B28AC0BC3DF4D08D507B2ECF26AE4091">Museum of Nature Hamburg Zoology, Leibniz Institute for the Analysis of Biodiversity Change (LIB), Martin-Luther-King-Platz 3, D- 20146, Hamburg, Germany &amp; Research Group Zoology: Biodiversity and Toxicology, Centre for Environmental Sciences, Hasselt University, Universitaire Campus Gebouw D, B- 3590 Diepenbeek, Belgium</mods:affiliation>
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<mods:namePart id="384E4F61AFFE06E0CB37B8283BE0FF4F">Schmidt-Rhaesa, Andreas</mods:namePart>
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<mods:affiliation id="9815EE01E0CE74029FCB4A8CDC1F4A19">Museum of Nature Hamburg Zoology, Leibniz Institute for the Analysis of Biodiversity Change (LIB), Martin-Luther-King-Platz 3, D- 20146, Hamburg, Germany</mods:affiliation>
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<mods:title id="B5C1F50B9FCE4F5FB76D81578B3C0411">Evolutionary Systematics</mods:title>
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<mods:date id="3327FE3524C0CFC7AB2CAA398259FBB4">2024</mods:date>
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<mods:number id="7FACAD37E57493E0F6E2EF704B6AFD5F">2024-12-19</mods:number>
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<mods:number id="A9EC29FC2F5456254BFB6260DBBF4BBC">8</mods:number>
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<treatment id="7E99A86DF6EC5F929059E6C76CE50A53" ID-arpha="7E99A86D-F6EC-5F92-9059-E6C76CE50A53" LSID="urn:lsid:plazi:treatment:7E99A86DF6EC5F929059E6C76CE50A53" httpUri="http://treatment.plazi.org/id/7E99A86DF6EC5F929059E6C76CE50A53">
<subSubSection id="598006EEFA0B0A74D122F3E8C7F44A05" type="nomenclature">
<paragraph id="E1F378B820A129CB98CDF27ED42E6017">
<taxonomicName id="170DF44B9D1CA3A7410A769C5061266A" ID-CoL="88YSM" authority="Ijima, 1884" authorityName="Ijima" authorityYear="1884" family="Planariidae" genus="Polycelis" kingdom="Animalia" order="Tricladida" phylum="Platyhelminthes" rank="species" species="tenuis">
<emphasis id="AC00A95ECD3E82EFD130112A2CC22872" italics="true">Polycelis tenuis</emphasis>
Ijima, 1884
</taxonomicName>
</paragraph>
</subSubSection>
<subSubSection id="F575E964538A8E5D927C6EFBE819039A" type="description">
<paragraph id="6FA1048F7809AB1A255D3048CD5ADD4E">
<figureCitation id="774A62A9D341A2C7DEF7B9FEC82648EE" captionStart="Figure 14" captionStartId="F14" captionText="Figure 14. Polycelis tenuis. A. Habitus of swimming adult specimen; B. Squeezed adult specimen; C, D. Squeezed juvenile; E. Atrial organs; F. Spines of the penial papilla. Scale bars: 200 μm (D); 600 μm (E); 100 μm (F)." httpUri="https://binary.pensoft.net/fig/1203027">Fig. 14</figureCitation>
</paragraph>
</subSubSection>
<subSubSection id="SECID0ESNDK" type="distribution">
<paragraph id="6B37174F99B672652CDFEED5CABF5519">
<heading id="E5DD0A03BBE59BCE7E44B1618DA09C35" reason="title">Known distribution.</heading>
</paragraph>
<paragraph id="8C3B33BD0B846DD65A276CB4E3B6B683">
Species recorded from
<collectingCountry id="D144FA3FC9905F3B197C105210516B8E" name="Netherlands">The Netherlands</collectingCountry>
(
<bibRefCitation id="98BC6C6F01BB42F28779A0189A8FC71D" author="Young" firstAuthor="Young" journalOrPublisher="Zoologische Bijdragen" pagination="59-70" refId="B122" refString="Young JO (1972) The Turbellaria of some Friesland lakes with incidental records of Gasteropoda [sic] and Hirudinea. Zoologische Bijdragen 13: 5970." title="The Turbellaria of some Friesland lakes with incidental records of Gasteropoda [sic] and Hirudinea." volume="13" year="1972">Young 1972</bibRefCitation>
),
<collectingCountry id="D213F71C9307E683D35D2FD2FCFD8EFE" name="Finland">Finland</collectingCountry>
,
<collectingCountry id="0C0905C615AE30A57BA70A8CBE638E0F" name="United Kingdom">United Kingdom</collectingCountry>
and
<collectingCountry id="F451C6EA297F10769354D7C9B834EE3D" name="Ireland">Ireland</collectingCountry>
(
<bibRefCitation id="A3AE95E9F1EFDED0C741C321E6493ED8" author="Luther" firstAuthor="Luther" journalOrPublisher="Fauna Fennica" pagination="1-42" refId="B62" refString="Luther A (1961) Die Turbellarien Ostfennoskandiens 2. Tricladida. Fauna Fennica 11: 142." title="Die Turbellarien Ostfennoskandiens 2. Tricladida." volume="11" year="1961">Luther 1961</bibRefCitation>
), Gernany (
<bibRefCitation id="49E2BA93D4FAB1B847A4847B6A8CFC08" author="Schwank" firstAuthor="Schwank" refId="B102" refString="Schwank P (1981) Turbellarien, Oligochaeten und Archianneliden des Breitenbachs und anderer oberhessischer Mittelgebirgsbäche - 1. Lokalgeographische Verbreitung und die Verteilung der Arten in den einzelnen Gewässern in Abhängigkeit vom Substrat (Schlitzer produktionsbiologische Studien (43-1 )). Archiv für Hydrobiologie 1 (Suppl. 62): 185." year="1981">Schwank 1981</bibRefCitation>
;
<bibRefCitation id="6B2A489D18D54E4D34BDC2CDFE538C2D" DOI="10.1899/11-092.1" author="Martin and Brunke" firstAuthor="Martin" issue="2" journalOrPublisher="Freshwater Science" pagination="542-562" refId="B70" refString="Martin P, Brunke M (2012) Faunal typology of lowland springs in northern Germany. Freshwater Science 31 (2): 542562. https://doi.org/10.1899/11-092.1" title="Faunal typology of lowland springs in northern Germany." volume="31" year="2012">Martin and Brunke 2012</bibRefCitation>
), Macedonia (
<bibRefCitation id="083801938A6A1D64F34352D097ED0F1B" DOI="10.5479/si.00810282.280" author="Kenk" firstAuthor="Kenk" journalOrPublisher="Smithsonian Contributions to Zoology" pagination="1-56" refId="B50" refString="Kenk R (1978) The planarians (Turbellaria: Tricladida, Paludicola) of Lake Ohrid in Macedonia. Smithsonian Contributions to Zoology 280: 156. https://doi.org/10.5479/si.00810282.280" title="The planarians (Turbellaria: Tricladida, Paludicola) of Lake Ohrid in Macedonia." volume="280" year="1978">Kenk 1978</bibRefCitation>
),
<collectingCountry id="375F0230A0298A1714685D88CFF226F8" name="Romania">Romania</collectingCountry>
(
<bibRefCitation id="D0D22DF9E11BD0E0DB0BC38C336DFC0A" author="Felicia" firstAuthor="Felicia" journalOrPublisher="Analele Universitatii din Craiova Biologie Horticultura Tehnologia Prelucrarii Produselor Agricole Ingineria Mediului" pagination="275-285" refId="B30" refString="Felicia BA (2018) On the freshwater tricladid flatworms (Platyhelminthes, Tricladida) in the urban areas of Craiova (Romania) - Preliminary Data. Analele Universitatii din Craiova Biologie Horticultura Tehnologia Prelucrarii Produselor Agricole Ingineria Mediului 23: 275285." title="On the freshwater tricladid flatworms (Platyhelminthes, Tricladida) in the urban areas of Craiova (Romania) - Preliminary Data." volume="23" year="2018">Felicia 2018</bibRefCitation>
), and
<collectingCountry id="54D4AD7D51CAC75A5297082F8844117D" name="Russia">Russia</collectingCountry>
(
<bibRefCitation id="1DDA3245E194B28C6CD2635AF60D6918" author="Luther" firstAuthor="Luther" journalOrPublisher="Fauna Fennica" pagination="1-42" refId="B62" refString="Luther A (1961) Die Turbellarien Ostfennoskandiens 2. Tricladida. Fauna Fennica 11: 142." title="Die Turbellarien Ostfennoskandiens 2. Tricladida." volume="11" year="1961">Luther 1961</bibRefCitation>
).
</paragraph>
</subSubSection>
<subSubSection id="SECID0EUODK" type="material">
<paragraph id="6FB70DC0DAB055207837C4C572A925E3">
<heading id="9B50F7FF2CD568508841CCEA0AB6D881" reason="title">Material.</heading>
</paragraph>
<paragraph id="5F020478013FE3814E767C516DE733C6">
<specimenCount id="C0ACD6F699D393B4A73D1E1D8B71F95A" count="6" type="generic">Six specimens</specimenCount>
studied alive, preserved in absolute ethanol for future molecular analyses; collected in Kirchwerder-Fünfhausen, submerged vegetation and litter in an irrigation channel,
<quantity id="22286E081C2998729EC83AF03B8FA51C" metricMagnitude="-1" metricUnit="m" metricValue="1.5" metricValueMax="2.0" metricValueMin="1.0" unit="m" value="0.15" valueMax="0.2" valueMin="0.1">0.10.2 m</quantity>
deep.
</paragraph>
</subSubSection>
<subSubSection id="SECID0EZODK" type="remarks">
<paragraph id="4029532875270D46CD742774D2085591">
<heading id="5530B7627F1F353F6EE693575EDB0895" reason="title">Remarks.</heading>
</paragraph>
<paragraph id="D73393D369B6591917971B4C2E21E662">
Mature specimens measuring
<quantity id="34B3363269631225129B60CD8A5FBEB3" metricMagnitude="-4" metricUnit="m" metricValue="8.5" metricValueMax="12.0" metricValueMin="5.0" unit="mm" value="0.85" valueMax="1.2" valueMin="0.5">0.51.2 mm</quantity>
, dark coloured (Fig.
<figureCitation id="25CC4029EB9CFB07CE8AB9F58E6BF3FF" captionStart="Figure 14" captionStartId="F14" captionText="Figure 14. Polycelis tenuis. A. Habitus of swimming adult specimen; B. Squeezed adult specimen; C, D. Squeezed juvenile; E. Atrial organs; F. Spines of the penial papilla. Scale bars: 200 μm (D); 600 μm (E); 100 μm (F)." httpUri="https://binary.pensoft.net/fig/1203027">14 A, B</figureCitation>
). Marginal eyes (Fig.
<figureCitation id="10067E8A5ED9C445BDBEFAA27562076C" captionStart="Figure 14" captionStartId="F14" captionText="Figure 14. Polycelis tenuis. A. Habitus of swimming adult specimen; B. Squeezed adult specimen; C, D. Squeezed juvenile; E. Atrial organs; F. Spines of the penial papilla. Scale bars: 200 μm (D); 600 μm (E); 100 μm (F)." httpUri="https://binary.pensoft.net/fig/1203027">14 C, D</figureCitation>
: e) distributed over the anterior third of the body. The pharynx (Fig.
<figureCitation id="FEB2CE4E7E7D9995EF265E443715FC3F" captionStart="Figure 14" captionStartId="F14" captionText="Figure 14. Polycelis tenuis. A. Habitus of swimming adult specimen; B. Squeezed adult specimen; C, D. Squeezed juvenile; E. Atrial organs; F. Spines of the penial papilla. Scale bars: 200 μm (D); 600 μm (E); 100 μm (F)." httpUri="https://binary.pensoft.net/fig/1203027">14 B, C</figureCitation>
) is located over the midbody and the mouth (Fig.
<figureCitation id="7C4B33CE74982D52E6BDF0140E4A3265" captionStart="Figure 14" captionStartId="F14" captionText="Figure 14. Polycelis tenuis. A. Habitus of swimming adult specimen; B. Squeezed adult specimen; C, D. Squeezed juvenile; E. Atrial organs; F. Spines of the penial papilla. Scale bars: 200 μm (D); 600 μm (E); 100 μm (F)." httpUri="https://binary.pensoft.net/fig/1203027">14 C, E</figureCitation>
: m) opens anterior to the male copulatory organ. The male copulatory organ (Fig.
<figureCitation id="1477A010EDFB421956452871BEC38706" captionStart="Figure 14" captionStartId="F14" captionText="Figure 14. Polycelis tenuis. A. Habitus of swimming adult specimen; B. Squeezed adult specimen; C, D. Squeezed juvenile; E. Atrial organs; F. Spines of the penial papilla. Scale bars: 200 μm (D); 600 μm (E); 100 μm (F)." httpUri="https://binary.pensoft.net/fig/1203027">14 B, E</figureCitation>
: mco) is 9401100 µm long (n = 1; varying according to the relaxing stage) and 620 µm at widest. The male organ is spiny over its distal 300480 µm, and forms a penial papilla (Fig.
<figureCitation id="8CB4128D308A766F6B88A8B06D6C0816" captionStart="Figure 14" captionStartId="F14" captionText="Figure 14. Polycelis tenuis. A. Habitus of swimming adult specimen; B. Squeezed adult specimen; C, D. Squeezed juvenile; E. Atrial organs; F. Spines of the penial papilla. Scale bars: 200 μm (D); 600 μm (E); 100 μm (F)." httpUri="https://binary.pensoft.net/fig/1203027">14 E</figureCitation>
:
<abbrev id="ABBRID0EXPDK" xlink_title="posterior probabilities">pp</abbrev>
). The spines (Fig.
<figureCitation id="A6D1448DE5B80DCE6881DAD0230FB095" captionStart="Figure 14" captionStartId="F14" captionText="Figure 14. Polycelis tenuis. A. Habitus of swimming adult specimen; B. Squeezed adult specimen; C, D. Squeezed juvenile; E. Atrial organs; F. Spines of the penial papilla. Scale bars: 200 μm (D); 600 μm (E); 100 μm (F)." httpUri="https://binary.pensoft.net/fig/1203027">14 F</figureCitation>
) are 1718 µm long (n = 10). Two adenodactyls (Fig.
<figureCitation id="653409774323CECD6355B2D99A90908B" captionStart="Figure 14" captionStartId="F14" captionText="Figure 14. Polycelis tenuis. A. Habitus of swimming adult specimen; B. Squeezed adult specimen; C, D. Squeezed juvenile; E. Atrial organs; F. Spines of the penial papilla. Scale bars: 200 μm (D); 600 μm (E); 100 μm (F)." httpUri="https://binary.pensoft.net/fig/1203027">14 E</figureCitation>
: ad) are located posterior to the male bulb and open into the common atrium, oriented forward, and exhibiting a glandular lumen.
</paragraph>
<caption id="2866BB286034A0E4BDACC859F1EC93AE" ID-arpha="294F6AE4-EDCB-509D-9C50-3B60BFF6EFCA" httpUri="https://binary.pensoft.net/fig/1203027" startId="F14">
<paragraph id="C00ACC14C399DC189622CCB5F13517EE">
<label id="148B821463C5E906D9515F70FD05C422">Figure 14.</label>
</paragraph>
<paragraph id="EDA350FF2671663DF428731FC0C111C0">
<taxonomicName id="32077DAC107508A5FD399C5205E019C6" authorityName="Ijima" authorityYear="1884" family="Planariidae" genus="Polycelis" kingdom="Animalia" order="Tricladida" phylum="Platyhelminthes" rank="species" species="tenuis">
<emphasis id="559A0AE741448F3AED1943B925451156" italics="true">Polycelis tenuis</emphasis>
</taxonomicName>
.
<emphasis id="A0BBB192679052E7AC2B4F7929490924" bold="true">A.</emphasis>
Habitus of swimming adult specimen;
<emphasis id="35F6566A365A2E0260A2F0B6483907D4" bold="true">B.</emphasis>
Squeezed adult specimen;
<emphasis id="F964BD3B5E117406C87087B93D65D3FD" bold="true">C, D.</emphasis>
Squeezed juvenile;
<emphasis id="1C45BF94B4F870CC00864241704E819F" bold="true">E.</emphasis>
Atrial organs;
<emphasis id="EDD9820E2B715AF3C84E3F061F80A033" bold="true">F.</emphasis>
Spines of the penial papilla. Scale bars: 200 μm (
<emphasis id="252A0FBC1D3E556E8D33967A5A667FD9" bold="true">D</emphasis>
); 600 μm (
<emphasis id="C515745DC900CC02B1DCAA18859C3D2D" bold="true">E</emphasis>
); 100 μm (
<emphasis id="E2F30D26CC81ECF48DEFF1289DD2659F" bold="true">F</emphasis>
).
</paragraph>
</caption>
<paragraph id="19A7167AE6677BF0D885BB10A264B684">
Three species of
<taxonomicName id="42983F9A9F77355158C6CC80C77DC611" authorityName="Ehrenberg" authorityYear="1831" family="Planariidae" genus="Polycelis" kingdom="Animalia" order="Tricladida" phylum="Platyhelminthes" rank="genus">
<emphasis id="F3B91105F40579CABF6BF4E1BFF7AFA1" italics="true">Polycelis</emphasis>
</taxonomicName>
have been documented in
<collectingCountry id="7993A14379E6E02548690787A34F7739" name="Germany">Germany</collectingCountry>
, and they are widespread across Europe:
<taxonomicName id="61AEE8F4498E85846F63194E203FC7B7" baseAuthorityName="Dalyell" baseAuthorityYear="1814" family="Planariidae" genus="Polycelis" kingdom="Animalia" order="Tricladida" phylum="Platyhelminthes" rank="species" species="felina">
<emphasis id="4B4E28F572B23CC8055807AC38B95FE0" italics="true">P. felina</emphasis>
</taxonomicName>
,
<taxonomicName id="476DB4DCEEE391CB64C42617C350274F" authorityName="Ehrenberg" authorityYear="1831" baseAuthorityName="Muller" baseAuthorityYear="1774" family="Planariidae" genus="Polycelis" kingdom="Animalia" order="Tricladida" phylum="Platyhelminthes" rank="species" species="nigra">
<emphasis id="AAD7C9443923D90739B66D6DE7B09822" italics="true">P. nigra</emphasis>
</taxonomicName>
, and
<taxonomicName id="B32D79FFD734F6527AAA73BF97FDFA0F" authorityName="Ijima" authorityYear="1884" family="Planariidae" genus="Polycelis" kingdom="Animalia" order="Tricladida" phylum="Platyhelminthes" rank="species" species="tenuis">
<emphasis id="1537C5DFFF05EB838F2DD2AB71859A38" italics="true">P. tenuis</emphasis>
</taxonomicName>
(
<bibRefCitation id="FAF0415CC2A360A3E12D14764412E765" author="Volk" firstAuthor="Volk" journalOrPublisher="Mitteilungen aus dem Naturhistorischen Museum" pagination="6-154" refId="B119" refString="Volk R (1903) Die biologischen Verhältnisse der Elbe bei Hamburg. Einwirkung der Sielwässer auf die Organismen des Stromes. Mitteilungen aus dem Naturhistorischen Museum 19: 6154. https://www.zobodat.at/pdf/Mitt-Naturhist-Mus-Hamburg_19_0063-0154.pdf" title="Die biologischen Verhältnisse der Elbe bei Hamburg. Einwirkung der Sielwässer auf die Organismen des Stromes." url="https://www.zobodat.at/pdf/Mitt-Naturhist-Mus-Hamburg_19_0063-0154.pdf" volume="19" year="1903">Volk 1903</bibRefCitation>
;
<bibRefCitation id="9BF45CF53A79B6B69A0C0050086EA929" author="Ronneberger" firstAuthor="Ronneberger" issue="3" journalOrPublisher="Limnologica" pagination="323-419" refId="B94" refString="Ronneberger D (1975) Zur Kenntnis der Grundwasserfauna des Saale-Einzugsgebietes (Thüringen). Limnologica 9 (3): 323419." title="Zur Kenntnis der Grundwasserfauna des Saale-Einzugsgebietes (Thüringen)." volume="9" year="1975">Ronneberger 1975</bibRefCitation>
;
<bibRefCitation id="83799ED6635E438747E6BB16DEC13603" author="Schwank" firstAuthor="Schwank" refId="B102" refString="Schwank P (1981) Turbellarien, Oligochaeten und Archianneliden des Breitenbachs und anderer oberhessischer Mittelgebirgsbäche - 1. Lokalgeographische Verbreitung und die Verteilung der Arten in den einzelnen Gewässern in Abhängigkeit vom Substrat (Schlitzer produktionsbiologische Studien (43-1 )). Archiv für Hydrobiologie 1 (Suppl. 62): 185." year="1981">Schwank 1981</bibRefCitation>
;
<bibRefCitation id="854033EAFB70BF5C8D137448D059DD2E" author="Muller and Faubel" firstAuthor="Muller" pagination="363-396" refId="B73" refString="Müller D, Faubel A (1993) The Turbellaria of the River Elbe Estuary. A faunistic analysis of oligohaline and limnic areas. Archiv für Hydrobiologie Suppl. 75: 363396." title="The Turbellaria of the River Elbe Estuary. A faunistic analysis of oligohaline and limnic areas. Archiv für Hydrobiologie Suppl." volume="75" year="1993">Müller and Faubel 1993</bibRefCitation>
). Among these, only
<taxonomicName id="44C048FF40C932276FF8F5B5F4534D81" authorityName="Ehrenberg" authorityYear="1831" baseAuthorityName="Muller" baseAuthorityYear="1774" family="Planariidae" genus="Polycelis" kingdom="Animalia" order="Tricladida" phylum="Platyhelminthes" rank="species" species="nigra">
<emphasis id="ACFA395208F456B9100B37BF03E0BCB6" italics="true">P. nigra</emphasis>
</taxonomicName>
has been reported in
<collectingRegion id="E6BE7C3924807618236330564948B0A4" country="Germany" name="Hamburg">Hamburg</collectingRegion>
(
<bibRefCitation id="E155D7F8AFB29A5B2BB656A57AB2F079" author="Volk" firstAuthor="Volk" journalOrPublisher="Mitteilungen aus dem Naturhistorischen Museum" pagination="6-154" refId="B119" refString="Volk R (1903) Die biologischen Verhältnisse der Elbe bei Hamburg. Einwirkung der Sielwässer auf die Organismen des Stromes. Mitteilungen aus dem Naturhistorischen Museum 19: 6154. https://www.zobodat.at/pdf/Mitt-Naturhist-Mus-Hamburg_19_0063-0154.pdf" title="Die biologischen Verhältnisse der Elbe bei Hamburg. Einwirkung der Sielwässer auf die Organismen des Stromes." url="https://www.zobodat.at/pdf/Mitt-Naturhist-Mus-Hamburg_19_0063-0154.pdf" volume="19" year="1903">Volk 1903</bibRefCitation>
). Species within the genus
<taxonomicName id="11BE6BD5F89E3707B97A17BB17F58E5C" authorityName="Ehrenberg" authorityYear="1831" family="Planariidae" genus="Polycelis" kingdom="Animalia" order="Tricladida" phylum="Platyhelminthes" rank="genus">
<emphasis id="B93799DF23A4991D665ECB5D144B9A1D" italics="true">Polycelis</emphasis>
</taxonomicName>
are primarily distinguished by the structure of the male bulb and adenodactyls.
<taxonomicName id="E892CAB077E7C3AAC4CE37355513DE24" authorityName="Ijima" authorityYear="1884" family="Planariidae" genus="Polycelis" kingdom="Animalia" order="Tricladida" phylum="Platyhelminthes" rank="species" species="tenuis">
<emphasis id="19556E49D603F4F803111D048C5C62BC" italics="true">Polycelis tenuis</emphasis>
</taxonomicName>
shares with
<taxonomicName id="588F941D0D99C60CC17BC86E0FDCC54D" baseAuthorityName="Dalyell" baseAuthorityYear="1814" family="Planariidae" genus="Polycelis" kingdom="Animalia" order="Tricladida" phylum="Platyhelminthes" rank="species" species="felina">
<emphasis id="AB0110870AD2F5ED54C5E59D8C0B742E" italics="true">P. felina</emphasis>
</taxonomicName>
the presence of two adenodactyls, structures absent in
<taxonomicName id="DAA286A0F6933F7359C6A87BA37A96D7" authorityName="Ehrenberg" authorityYear="1831" baseAuthorityName="Muller" baseAuthorityYear="1774" family="Planariidae" genus="Polycelis" kingdom="Animalia" order="Tricladida" phylum="Platyhelminthes" rank="species" species="nigra">
<emphasis id="4A0C747C392BDF9542FE283662E059AF" italics="true">P. nigra</emphasis>
</taxonomicName>
. However,
<taxonomicName id="B07AD0051F2F236B3283F4B45B258E1D" baseAuthorityName="Dalyell" baseAuthorityYear="1814" family="Planariidae" genus="Polycelis" kingdom="Animalia" order="Tricladida" phylum="Platyhelminthes" rank="species" species="felina">
<emphasis id="692A4D6C693A337D634988A5A34B4878" italics="true">P. felina</emphasis>
</taxonomicName>
is easily identifiable by the presence of two tentacles in its anterior body region. The penial papilla of
<taxonomicName id="48CA062C34044B9B2ABE27EA8137C5C0" authorityName="Ijima" authorityYear="1884" family="Planariidae" genus="Polycelis" kingdom="Animalia" order="Tricladida" phylum="Platyhelminthes" rank="species" species="tenuis">
<emphasis id="FB20EF3BD51119605253A31A452D0F88" italics="true">P. tenuis</emphasis>
</taxonomicName>
is armed with spines along its distal half, whereas
<taxonomicName id="8A9FA16E4F58066CBADC7E23B7DB1584" authorityName="Ehrenberg" authorityYear="1831" baseAuthorityName="Muller" baseAuthorityYear="1774" family="Planariidae" genus="Polycelis" kingdom="Animalia" order="Tricladida" phylum="Platyhelminthes" rank="species" species="nigra">
<emphasis id="3605303750DB1A696DE25661E99F15D1" italics="true">P. nigra</emphasis>
</taxonomicName>
exhibits two to three spine rows distally, and
<taxonomicName id="77664F355BEC7A6F4BEC7C95F3F9AB0D" baseAuthorityName="Dalyell" baseAuthorityYear="1814" family="Planariidae" genus="Polycelis" kingdom="Animalia" order="Tricladida" phylum="Platyhelminthes" rank="species" species="felina">
<emphasis id="9CD3CD56717E5BF6990D57B5B521FC66" italics="true">P. felina</emphasis>
</taxonomicName>
lacks any spines in this region (
<bibRefCitation id="D923974D7E4B3A26D68970D28AE5CED9" DOI="10.1038/173354b0" author="Hansen-Melander" etAl="et al." firstAuthor="Hansen-Melander" journalOrPublisher="Nature" pagination="354-355" refId="B40" refString="Hansen-Melander E, Melander Y, Reynoldsen TB (1954) A new species of freshwater triclad belonging to the genus Polycelis. Nature 173: 354355. https://doi.org/10.1038/173354b0" title="A new species of freshwater triclad belonging to the genus Polycelis." volume="173" year="1954">Hansen-Melander et al. 1954</bibRefCitation>
;
<bibRefCitation id="966C8BB58E0E246F359DF937907AFFC1" author="Luther" firstAuthor="Luther" journalOrPublisher="Fauna Fennica" pagination="1-42" refId="B62" refString="Luther A (1961) Die Turbellarien Ostfennoskandiens 2. Tricladida. Fauna Fennica 11: 142." title="Die Turbellarien Ostfennoskandiens 2. Tricladida." volume="11" year="1961">Luther 1961</bibRefCitation>
;
<bibRefCitation id="7A36AE7436DB0F44D2116218F447810D" DOI="10.11646/zootaxa.3182.1.1" author="Harrath" etAl="et al." firstAuthor="Harrath" issue="1" journalOrPublisher="Zootaxa" pagination="1-15" refId="B41" refString="Harrath AH, Sluys R, Merzoug D, Yacoubi-Khebiza M, Alwasel S, Riutort M (2012) Freshwater planarians (Platyhelminthes, Tricladida) from the Palearctic section of the African continent: new records, with the description of a new species. Zootaxa 3182 (1): 115. https://doi.org/10.11646/zootaxa.3182.1.1" title="Freshwater planarians (Platyhelminthes, Tricladida) from the Palearctic section of the African continent: new records, with the description of a new species." volume="3182" year="2012">Harrath et al. 2012</bibRefCitation>
).
<bibRefCitation id="DD834AA91E5050B510FC0297E1A46915" author="Volk R" firstAuthor="Volk" journalOrPublisher="Mitteilungen aus dem Naturhistorischen Museum" pagination="6-154" refId="B119" refString="Volk R (1903) Die biologischen Verhältnisse der Elbe bei Hamburg. Einwirkung der Sielwässer auf die Organismen des Stromes. Mitteilungen aus dem Naturhistorischen Museum 19: 6154. https://www.zobodat.at/pdf/Mitt-Naturhist-Mus-Hamburg_19_0063-0154.pdf" title="Die biologischen Verhältnisse der Elbe bei Hamburg. Einwirkung der Sielwässer auf die Organismen des Stromes." url="https://www.zobodat.at/pdf/Mitt-Naturhist-Mus-Hamburg_19_0063-0154.pdf" volume="19" year="1903">Volk (1903)</bibRefCitation>
did not provide detailed morphological information about the specimens of
<taxonomicName id="0516B87452D4DCC125AD6A70A97F8534" authorityName="Ehrenberg" authorityYear="1831" baseAuthorityName="Muller" baseAuthorityYear="1774" family="Planariidae" genus="Polycelis" kingdom="Animalia" order="Tricladida" phylum="Platyhelminthes" rank="species" species="nigra">
<emphasis id="EB0BD5EE1CC61E802AC3B09FFE523227" italics="true">P. nigra</emphasis>
</taxonomicName>
recorded in
<collectingRegion id="DB0BFBC65DEAD331E276D69FDE5B77D4" country="Germany" name="Hamburg">Hamburg</collectingRegion>
. Given the necessity of studying the morphology of atrial organs for accurate identification of these triclads, this record requires confirmation.
</paragraph>
</subSubSection>
</treatment>
</document>