180 lines
19 KiB
XML
180 lines
19 KiB
XML
<document ID-DOI="http://dx.doi.org/10.3897/zookeys.57.310" ID-GBIF-Dataset="5ad3ae07-a7fd-4c73-8ae2-0ef689247936" ID-PMC="PMC3088335" ID-Pensoft-Pub="1313-2970-57-9" ID-PubMed="21594187" ModsDocAuthor="" ModsDocDate="2010" ModsDocID="1313-2970-57-9" ModsDocOrigin="ZooKeys 57" ModsDocTitle="Descriptions of two new species in the genus Macrostylis Sars, 1864 (Isopoda, Asellota, Macrostylidae) from the Weddell Sea (Southern Ocean), with a synonymisation of the genus Desmostylis Brandt, 1992 with Macrostylis" checkinTime="1451250980818" checkinUser="pensoft" docAuthor="Riehl, Torben & Brandt, Angelika" docDate="2010" docId="A77EA2C919EA22671C65DD350F7B0DAD" docLanguage="en" docName="ZooKeys 57: 9-49" docOrigin="ZooKeys 57" docSource="http://dx.doi.org/10.3897/zookeys.57.310" docTitle="Macrostylis G. O. Sars 1864" docType="treatment" docVersion="4" lastPageNumber="13" masterDocId="D000FF9C4B767A40E253731A9A79FFE2" masterDocTitle="Descriptions of two new species in the genus Macrostylis Sars, 1864 (Isopoda, Asellota, Macrostylidae) from the Weddell Sea (Southern Ocean), with a synonymisation of the genus Desmostylis Brandt, 1992 with Macrostylis" masterLastPageNumber="49" masterPageNumber="9" pageNumber="10" updateTime="1668162940139" updateUser="ExternalLinkService">
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<mods:titleInfo>
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<mods:title>Descriptions of two new species in the genus Macrostylis Sars, 1864 (Isopoda, Asellota, Macrostylidae) from the Weddell Sea (Southern Ocean), with a synonymisation of the genus Desmostylis Brandt, 1992 with Macrostylis</mods:title>
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<mods:name type="personal">
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<mods:role>
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<mods:roleTerm>Author</mods:roleTerm>
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<mods:namePart>Riehl, Torben</mods:namePart>
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<mods:name type="personal">
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<mods:roleTerm>Author</mods:roleTerm>
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<mods:namePart>Brandt, Angelika</mods:namePart>
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<mods:typeOfResource>text</mods:typeOfResource>
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<mods:relatedItem type="host">
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<mods:titleInfo>
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<mods:title>ZooKeys</mods:title>
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</mods:titleInfo>
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<mods:part>
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<mods:date>2010</mods:date>
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<mods:detail type="volume">
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<mods:number>57</mods:number>
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</mods:detail>
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<mods:extent unit="page">
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<mods:start>9</mods:start>
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<mods:end>49</mods:end>
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<mods:url>http://dx.doi.org/10.3897/zookeys.57.310</mods:url>
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</mods:location>
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<mods:classification>journal article</mods:classification>
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<mods:identifier type="DOI">http://dx.doi.org/10.3897/zookeys.57.310</mods:identifier>
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<mods:identifier type="Pensoft-Pub">1313-2970-57-9</mods:identifier>
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</mods:mods>
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<treatment ID-GBIF-Taxon="159359915" LSID="urn:lsid:plazi:treatment:A77EA2C919EA22671C65DD350F7B0DAD" httpUri="http://treatment.plazi.org/id/A77EA2C919EA22671C65DD350F7B0DAD" lastPageId="4" lastPageNumber="13" pageId="1" pageNumber="10">
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<subSubSection pageId="1" pageNumber="10" type="nomenclature">
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<paragraph pageId="1" pageNumber="10">
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<taxonomicName authority="G. O. Sars, 1864" authorityName="G. O. Sars" authorityYear="1864" class="Malacostraca" family="Macrostylidae" genus="Macrostylis" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Macrostylis" order="Isopoda" pageId="1" pageNumber="10" phylum="Arthropoda" rank="genus">Macrostylis G.O. Sars, 1864</taxonomicName>
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</paragraph>
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</subSubSection>
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<subSubSection pageId="1" pageNumber="10" type="reference_group">
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<paragraph pageId="1" pageNumber="10">
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<taxonomicName class="Malacostraca" family="Macrostylidae" genus="Macrostylis" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Macrostylis" order="Isopoda" pageId="1" pageNumber="10" phylum="Arthropoda" rank="genus">Macrostylis</taxonomicName>
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<bibRefCitation author="Sars, GO" journalOrPublisher="Anar 1863" pageId="30" pageNumber="39" pagination="205 - 221" title="Om en anomal Gruppe af Isopoder." volumeTitle="Forhandhlinger Videnskapsselskapet I Kristiania" year="1864">Sars 1864, p.13</bibRefCitation>
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;
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<bibRefCitation author="Sars, GO" journalOrPublisher="Bergen Museum" pageId="30" pageNumber="39" title="An Account of the Crustacea of Norway Vol. II." year="1899">1899, p. 120</bibRefCitation>
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;
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<bibRefCitation author="Beddard, FE" journalOrPublisher="Report of the Voyage of HMS Challenger" pageId="29" pageNumber="38" pagination="1 - 178" title="Report on the Isopoda collected by HMS Challenger during the years 1873 - 76. Part 2." volume="17" year="1886 b">Beddard 1886b, p. 173</bibRefCitation>
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;
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<bibRefCitation author="Hansen, HJ" journalOrPublisher="Danish Ingolf Expedition" pageId="29" pageNumber="38" pagination="1 - 262" title="Crustacea Malacostraca: The order Isopoda." volume="3" year="1916">Hansen 1916, p. 75</bibRefCitation>
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;
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<bibRefCitation author="Barnard, KH" journalOrPublisher="Annals of the South African Museum" pageId="29" pageNumber="38" pagination="319 - 428" title="Contribution to the Crustacean fauna of South Africa No. 6: Further Additions to the list of marine Isopoda." volume="17" year="1920">Barnard 1920, p. 411</bibRefCitation>
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;
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<bibRefCitation author="Wolff, T" journalOrPublisher="Galathea Report" pageId="30" pageNumber="39" pagination="85 - 157" title="Isopoda from depths exceeding 6000 meters." volume="2" year="1956">Wolff 1956, p. 99-106</bibRefCitation>
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;
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<bibRefCitation author="Wolff, T" journalOrPublisher="Galathea Report" pageId="30" pageNumber="39" pagination="1 - 320" title="The systematics and biology of bathyal and abyssal Isopoda Asellota." volume="6" year="1962">1962, p. 91-93</bibRefCitation>
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; Menzies 1962, p. 127-133;
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<bibRefCitation author="Birstein, JA" journalOrPublisher="Akademiya Nauk SSSR, Moscow" pageId="29" pageNumber="38" title="Deep water isopods (Crustacea. Isopoda) of the north-western part of the Pacific Ocean." year="1963 a">Birstein 1963a, p. 95-106</bibRefCitation>
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;
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<bibRefCitation author="Mezhov, B" journalOrPublisher="Zoologicheskii Zhurnal" pageId="29" pageNumber="38" pagination="983 - 994" title="The first findings of Macrostylidae (Isopoda, Asellota) in the Indian Ocean." volume="67" year="1988">Mezhov 1988, p. 60-69</bibRefCitation>
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;
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<bibRefCitation author="Brandt, A" journalOrPublisher="Zoologica Scripta" pageId="29" pageNumber="38" pagination="57 - 78" title="New Asellota from the Antarctic deep sea (Crustacea, Isopoda, Asellota), with descriptions of two new genera." volume="21" year="1992">Brandt 1992, p. 74-78</bibRefCitation>
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;
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<bibRefCitation author="Vey, A" journalOrPublisher="Zootaxa" pageId="30" pageNumber="39" pagination="356 - 370" title="Macrostylis cerritus sp. nov., a new species of Macrostylidae (Isopoda: Asellota from the Southern Ocean." volume="2096" year="2009">Vey & Brix 2009, p. 358</bibRefCitation>
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</paragraph>
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<paragraph pageId="1" pageNumber="10">
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<taxonomicName class="Malacostraca" family="Macrostylidae" genus="Vana" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Vana" order="Isopoda" pageId="1" pageNumber="10" phylum="Arthropoda" rank="genus">Vana</taxonomicName>
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<bibRefCitation author="Meinert, FVA" journalOrPublisher="' Hauchs' Togter" pageId="29" pageNumber="38" pagination="147 - 230" title="Crustacea malacostraca. Det Videnskabelige Udbytte af Kanonbaaden." volume="3" year="1890">Meinert 1890, p. 195</bibRefCitation>
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</paragraph>
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<paragraph pageId="1" pageNumber="10">
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<taxonomicName class="Malacostraca" family="Macrostylidae" genus="Desmostylis" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Desmostylis" order="Isopoda" pageId="1" pageNumber="10" phylum="Arthropoda" rank="genus">Desmostylis</taxonomicName>
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<bibRefCitation author="Brandt, A" journalOrPublisher="Zoologica Scripta" pageId="29" pageNumber="38" pagination="57 - 78" title="New Asellota from the Antarctic deep sea (Crustacea, Isopoda, Asellota), with descriptions of two new genera." volume="21" year="1992">Brandt 1992, p.70, Figs 11-13</bibRefCitation>
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</paragraph>
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</subSubSection>
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<subSubSection pageId="1" pageNumber="10" type="composition">
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<paragraph pageId="1" pageNumber="10">Composition.</paragraph>
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<paragraph pageId="1" pageNumber="10">See Table 2.</paragraph>
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<caption ID-Table-UUID="583E154CBFEB233BA7630F955503AD34" httpUri="http://table.plazi.org/id/583E154CBFEB233BA7630F955503AD34" pageId="1" pageNumber="10">
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<paragraph pageId="1" pageNumber="10">
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Table 2. Composition and distribution of
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<taxonomicName family="Macrostylidae" lsidName="" pageId="1" pageNumber="10" rank="family">Macrostylidae</taxonomicName>
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Hansen, 1916.
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</paragraph>
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</caption>
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<paragraph pageId="1" pageNumber="10">
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<table pageId="1" pageNumber="10">
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<tr pageId="1" pageNumber="10">
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<th colspan="2" pageId="1" pageNumber="10" rowspan="1">Taxon</th>
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<th colspan="1" pageId="1" pageNumber="10" rowspan="1">Locality</th>
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<th colspan="1" pageId="1" pageNumber="10" rowspan="1">Depth (m)</th>
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</tr>
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<tr pageId="1" pageNumber="10">
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<td colspan="4" pageId="1" pageNumber="10" rowspan="1">
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<taxonomicName class="Malacostraca" family="Macrostylidae" genus="Macrostylis" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Macrostylis" order="Isopoda" pageId="1" pageNumber="10" phylum="Arthropoda" rank="genus">Macrostylis</taxonomicName>
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</td>
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</tr>
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</table>
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</paragraph>
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</subSubSection>
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<subSubSection pageId="1" pageNumber="10" type="type species">
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<paragraph pageId="1" pageNumber="10">Type species.</paragraph>
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<paragraph pageId="1" pageNumber="10">
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<taxonomicName class="Malacostraca" family="Macrostylidae" genus="Macrostylis" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Macrostylis spinifera" order="Isopoda" pageId="1" pageNumber="10" phylum="Arthropoda" rank="species" species="spinifera">Macrostylis spinifera</taxonomicName>
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Sars, 1864
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</paragraph>
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</subSubSection>
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<subSubSection pageId="1" pageNumber="10" type="diagnosis">
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<paragraph pageId="1" pageNumber="10">Diagnosis.</paragraph>
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<paragraph pageId="1" pageNumber="10">As of the family.</paragraph>
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</subSubSection>
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<subSubSection lastPageId="4" lastPageNumber="13" pageId="1" pageNumber="10" type="remarks">
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<paragraph pageId="1" pageNumber="10">Remarks.</paragraph>
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<paragraph pageId="1" pageNumber="10">Some characters are absent or poorly illustrated in original descriptions and could not be analysed thoroughly during this study. Therefore these have not been included in the family diagnosis (e.g. presence of exopod of pleopod 5, setation patterns and setal substructures).</paragraph>
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<paragraph pageId="2" pageNumber="11">
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<pageBreakToken pageId="2" pageNumber="11" start="start">Following</pageBreakToken>
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the original description (
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<bibRefCitation author="Brandt, A" journalOrPublisher="Zoologica Scripta" pageId="29" pageNumber="38" pagination="57 - 78" title="New Asellota from the Antarctic deep sea (Crustacea, Isopoda, Asellota), with descriptions of two new genera." volume="21" year="1992">Brandt 1992</bibRefCitation>
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),
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<taxonomicName class="Malacostraca" family="Macrostylidae" genus="Desmostylis" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Desmostylis" order="Isopoda" pageId="2" pageNumber="11" phylum="Arthropoda" rank="genus">Desmostylis</taxonomicName>
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can be separated from
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<taxonomicName class="Malacostraca" family="Macrostylidae" genus="Macrostylis" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Macrostylis" order="Isopoda" pageId="2" pageNumber="11" phylum="Arthropoda" rank="genus">Macrostylis</taxonomicName>
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by the following characters: absence of dorsal triangular expansion on the pereopod 3 ischium, lack of dactylus on pereopod 4 and of claws on pereopods 5-7. However, after comparisons of different species of
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<taxonomicName class="Malacostraca" family="Macrostylidae" genus="Macrostylis" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Macrostylis" order="Isopoda" pageId="2" pageNumber="11" phylum="Arthropoda" rank="genus">Macrostylis</taxonomicName>
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, and re-examination of the holotype of
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<taxonomicName class="Malacostraca" family="Macrostylidae" genus="Desmostylis" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Desmostylis obscurus" order="Isopoda" pageId="2" pageNumber="11" phylum="Arthropoda" rank="species" species="obscurus">Desmostylis obscurus</taxonomicName>
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Brandt, 1992 these characters have been found not to be delimitating
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<taxonomicName class="Malacostraca" family="Macrostylidae" genus="Desmostylis" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Desmostylis" order="Isopoda" pageId="2" pageNumber="11" phylum="Arthropoda" rank="genus">Desmostylis</taxonomicName>
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from
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<taxonomicName class="Malacostraca" family="Macrostylidae" genus="Macrostylis" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Macrostylis" order="Isopoda" pageId="2" pageNumber="11" phylum="Arthropoda" rank="genus">Macrostylis</taxonomicName>
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. Shape and extension of pereopod 3 ischium varies greatly between species of
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<taxonomicName class="Malacostraca" family="Macrostylidae" genus="Macrostylis" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Macrostylis" order="Isopoda" pageId="2" pageNumber="11" phylum="Arthropoda" rank="genus">Macrostylis</taxonomicName>
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. For example
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<taxonomicName class="Malacostraca" family="Macrostylidae" genus="Macrostylis" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Macrostylis galatheae" order="Isopoda" pageId="2" pageNumber="11" phylum="Arthropoda" rank="species" species="galatheae">Macrostylis galatheae</taxonomicName>
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Wolff, 1956 (p. 101, Fig. 17) has a strong and acute extension and no extension is present in
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<taxonomicName class="Malacostraca" family="Macrostylidae" genus="Macrostylis" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Macrostylis abyssalis" order="Isopoda" pageId="2" pageNumber="11" phylum="Arthropoda" rank="species" species="abyssalis">Macrostylis abyssalis</taxonomicName>
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Brandt, 2004 (p. 28, Fig. 15), very similar to
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<taxonomicName class="Malacostraca" family="Macrostylidae" genus="Desmostylis" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Desmostylis obscurus" order="Isopoda" pageId="2" pageNumber="11" phylum="Arthropoda" rank="species" species="obscurus">Desmostylis obscurus</taxonomicName>
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. However, another described species of
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<taxonomicName class="Malacostraca" family="Macrostylidae" genus="Desmostylis" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Desmostylis" order="Isopoda" pageId="2" pageNumber="11" phylum="Arthropoda" rank="genus">Desmostylis</taxonomicName>
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,
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<taxonomicName class="Malacostraca" family="Macrostylidae" genus="Desmostylis" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Desmostylis gerdesi" order="Isopoda" pageId="2" pageNumber="11" phylum="Arthropoda" rank="species" species="gerdesi">Desmostylis gerdesi</taxonomicName>
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Brandt, 2002 shows a strongly fossorial pereopod 3 bearing a prominent dorsal extension on the ischium. Thus, the condition of this character in
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<taxonomicName class="Malacostraca" family="Macrostylidae" genus="Desmostylis" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Desmostylis" order="Isopoda" pageId="2" pageNumber="11" phylum="Arthropoda" rank="genus">Desmostylis</taxonomicName>
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lies within the interspecific range of variation in
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<taxonomicName class="Malacostraca" family="Macrostylidae" genus="Macrostylis" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Macrostylis" order="Isopoda" pageId="2" pageNumber="11" phylum="Arthropoda" rank="genus">Macrostylis</taxonomicName>
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. Therefore, this character is not usable to maintain the genus
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<taxonomicName class="Malacostraca" family="Macrostylidae" genus="Desmostylis" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Desmostylis" order="Isopoda" pageId="2" pageNumber="11" phylum="Arthropoda" rank="genus">Desmostylis</taxonomicName>
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.
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</paragraph>
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<paragraph lastPageId="3" lastPageNumber="12" pageId="2" pageNumber="11">
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The absence of a pereopod 4 dactylus was another generic character of
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<taxonomicName class="Malacostraca" family="Macrostylidae" genus="Desmostylis" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Desmostylis" order="Isopoda" pageId="2" pageNumber="11" phylum="Arthropoda" rank="genus">Desmostylis</taxonomicName>
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. However, the dactyli in
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<taxonomicName class="Malacostraca" family="Macrostylidae" genus="Desmostylis" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Desmostylis obscurus" order="Isopoda" pageId="2" pageNumber="11" phylum="Arthropoda" rank="species" species="obscurus">Desmostylis obscurus</taxonomicName>
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are not absent but have been overseen in the original description and they were distorted in the pereopod illustrated of the holotype. The value of differences in setal counts or occurrence of types of setae on pereopod 3 ischium for discriminating between two genera is not known. The genus
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<taxonomicName class="Malacostraca" family="Macrostylidae" genus="Desmostylis" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Desmostylis" order="Isopoda" pageId="2" pageNumber="11" phylum="Arthropoda" rank="genus">Desmostylis</taxonomicName>
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<pageBreakToken pageId="3" pageNumber="12" start="start">was</pageBreakToken>
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erected on basis of a juvenile specimen. Using ontogenetically variable characters of a juvenile type specimen to erect a new genus is problematic.
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</paragraph>
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<paragraph pageId="4" pageNumber="13">
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<pageBreakToken pageId="4" pageNumber="13" start="start">Dactylar</pageBreakToken>
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setae fit the definition of claws (
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<bibRefCitation author="Wilson, GDF" journalOrPublisher="Bulletin of the Scripps Institution of Oceanography" pageId="30" pageNumber="39" pagination="1 - 138" title="A systematic revision of the deep-sea subfamily Lipomerinae of the isopod crustacean family Munnopsidae." volume="27" year="1989">Wilson 1989</bibRefCitation>
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): terminal/subterminal modified setae on pereopodal dactyli with pronounced sclerotisation and a sharp tip. This definition was to the
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<normalizedToken originalValue="authors’">authors'</normalizedToken>
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knowledge not narrowed since then. Taking into account the incomplete documentation of dactylar claws in the literature on the one hand, and insufficient knowledge about plasticity of setae and their substructures on the other, a differentiation of genera exclusively based on such characters seems problematic. Due to the above listed reasons we consider the genus
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<taxonomicName class="Malacostraca" family="Macrostylidae" genus="Desmostylis" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Desmostylis" order="Isopoda" pageId="4" pageNumber="13" phylum="Arthropoda" rank="genus">Desmostylis</taxonomicName>
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synonymous with
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<taxonomicName class="Malacostraca" family="Macrostylidae" genus="Macrostylis" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Macrostylis" order="Isopoda" pageId="4" pageNumber="13" phylum="Arthropoda" rank="genus">Macrostylis</taxonomicName>
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.
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</paragraph>
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</subSubSection>
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</treatment>
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</document> |