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181 lines
19 KiB
XML
<document ID-DOI="http://dx.doi.org/10.3897/zookeys.646.10701" ID-GBIF-Dataset="cf4bad19-1e6f-48fb-bc09-8943fc94f488" ID-PMC="PMC5299443" ID-Pensoft-Pub="1313-2970-646-109" ID-PubMed="28228679" ID-ZBK="0549FC963D1C4B41B775780E02D0AA23" ModsDocAuthor="" ModsDocDate="2017" ModsDocID="1313-2970-646-109" ModsDocOrigin="ZooKeys 646" ModsDocTitle="A new species of Aspidophryxus (Isopoda, Dajidae), ectoparasitic on Mysidellahoshinoi (Mysidae) in Japan" checkinTime="1484862059482" checkinUser="pensoft" docAuthor="Shimomura, Michitaka" docDate="2017" docId="8677BBCC54EF12D6974321181C89F4C5" docLanguage="en" docName="ZooKeys 646: 109-118" docOrigin="ZooKeys 646" docSource="http://dx.doi.org/10.3897/zookeys.646.10701" docTitle="Aspidophryxus izuensis Shimomura, 2017, sp. n." docType="treatment" docUuid="406F5790-697C-4411-8E0C-1FB94D4E26E6" docUuidSource="ZooBank" docVersion="5" lastPageNumber="116" masterDocId="5C4C56508B3BFFA8FFFA140DFFA7C56F" masterDocTitle="A new species of Aspidophryxus (Isopoda, Dajidae), ectoparasitic on Mysidellahoshinoi (Mysidae) in Japan" masterLastPageNumber="118" masterPageNumber="109" pageNumber="111" updateTime="1668163891336" updateUser="ExternalLinkService">
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<mods:mods xmlns:mods="http://www.loc.gov/mods/v3">
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<mods:titleInfo>
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<mods:title>A new species of Aspidophryxus (Isopoda, Dajidae), ectoparasitic on Mysidellahoshinoi (Mysidae) in Japan</mods:title>
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</mods:titleInfo>
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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:role>
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<mods:namePart>Shimomura, Michitaka</mods:namePart>
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</mods:name>
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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>2017</mods:date>
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<mods:detail type="volume">
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<mods:number>646</mods:number>
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</mods:detail>
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<mods:extent unit="page">
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<mods:start>109</mods:start>
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<mods:end>118</mods:end>
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</mods:extent>
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</mods:part>
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</mods:relatedItem>
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<mods:location>
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<mods:url>http://dx.doi.org/10.3897/zookeys.646.10701</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.646.10701</mods:identifier>
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<mods:identifier type="Pensoft-Pub">1313-2970-646-109</mods:identifier>
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<mods:identifier type="ZBK">0549FC963D1C4B41B775780E02D0AA23</mods:identifier>
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<mods:identifier type="ZooBank">0549FC963D1C4B41B775780E02D0AA23</mods:identifier>
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</mods:mods>
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<treatment ID-GBIF-Taxon="127898107" LSID="urn:lsid:zoobank.org:act:406F5790-697C-4411-8E0C-1FB94D4E26E6" httpUri="http://treatment.plazi.org/id/8677BBCC54EF12D6974321181C89F4C5" lastPageId="7" lastPageNumber="116" pageId="2" pageNumber="111">
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<subSubSection pageId="2" pageNumber="111" type="nomenclature">
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<paragraph pageId="2" pageNumber="111">
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<taxonomicName LSID="http://zoobank.org/406F5790-697C-4411-8E0C-1FB94D4E26E6" class="Malacostraca" family="Dajidae" genus="Aspidophryxus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Aspidophryxus izuensis" order="Isopoda" pageId="2" pageNumber="111" phylum="Arthropoda" rank="species" species="izuensis">
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<pageBreakToken pageId="2" pageNumber="111" start="start">Aspidophryxus</pageBreakToken>
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izuensis
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</taxonomicName>
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<taxonomicNameLabel pageId="2" pageNumber="111">sp. n.</taxonomicNameLabel>
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Figs 1, 2, 3, 4
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</paragraph>
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</subSubSection>
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<subSubSection pageId="2" pageNumber="111" type="materials_examined">
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<paragraph pageId="2" pageNumber="111">Material examined.</paragraph>
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<paragraph pageId="2" pageNumber="111">Holotype. Ovigerous ♀ (1.4 mm) (KMNH IvR 500908), Akino-hama, Izu-Oshima Island, Sagami Sea, Japan, 23 August 2014, 35 m.</paragraph>
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<paragraph pageId="2" pageNumber="111">Allotype. 1 ♂(KMNH IvR 500911), obtained from the holotype.</paragraph>
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<paragraph pageId="2" pageNumber="111">Paratypes. 2 ovigerous ♀♀, 1.3 mm (KMNH IvR 500909), 1.2 mm (KMNH IvR 500910), 2 ♂♂, 0.5 mm (KMNH IvR500912), obtained from the female (KMNH IvR 500909), 0.5 mm (KMNH IvR500913), obtained from the female (KMNH IvR 500910), data same as holotype; 2 ovigerous ♀♀, 1.5 mm (KMNH IvR 500914), 1.5 mm (KMNH IvR 500915), 2 ♂♂, 0.5 mm (KMNH IvR500916), obtained from the female (KMNH IvR 500914), 0.5 mm (KMNH IvR500917), obtained from the female (KMNH IvR 500915), Akino-hama, Izu-Oshima Island, Sagami Sea, Japan, 9 August 2014, 35 m; 1 non-ovigerous ♀, 0.8 mm (KMNH IvR 500918), Akino-hama, Izu-Oshima Island, Sagami Sea, Japan, 19 August 2014, 35 m; 1 ovigerous ♀, 0.5 mm (KMNH IvR 500919), 1 ♂, 0.5 mm (KMNH IvR500920), obtained from the female (KMNH IvR 500919), Akino-hama, Izu-Oshima Island, Sagami Sea, Japan, 26 August 2014, 35 m.</paragraph>
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</subSubSection>
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<subSubSection pageId="2" pageNumber="111" type="diagnosis">
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<paragraph pageId="2" pageNumber="111">Diagnosis.</paragraph>
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<paragraph pageId="2" pageNumber="111">Female: body length and width subequal, anteriorly widest; frontal margin of cephalon exceeding anterior margins of lateral lamellae; frontal part of cephalon half as long as wide; pleon unsegmented, vermiform, elongate half as long as total body length. Male: cephalon fused with first pereomere; uropod composed of protopod and inner and outer ramus.</paragraph>
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</subSubSection>
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<subSubSection pageId="2" pageNumber="111" type="description">
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<paragraph pageId="2" pageNumber="111">Description of female.</paragraph>
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<paragraph pageId="2" pageNumber="111">
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Body (Figs 2A, B, 5A) semicircular, anteriorly widest, 1.1 times as long as maximum width (including lateral lamellae), moderately vaulted dorsally, with pair of broad lateral lamellae filled with 145 eggs; lateral lamellae not reaching beyond frontal margin of cephalon. Egg diameter ranged from 72.8 to 88.4
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<normalizedToken originalValue="µm">µm</normalizedToken>
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(N = 20; average = 81.8
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<normalizedToken originalValue="±">+/-</normalizedToken>
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3.9). Cephalon (Fig. 2B; see Fig. 5A, B) oriented ventrally, without eyes; frontal part long, half as long as wide; anterior margin rounded; posterior margin not visible in dorsal view. Pereon (Fig. 2A) without transverse folds. Medioventral edge of lateral lamellae produced into two digitiform extensions anterior to insertion of pleon (Figs 2B, 5C, E); posterior extension with many scale-like wrinkles. Pleon (Figs 2B, 5A,
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<normalizedToken originalValue="D–F">D-F</normalizedToken>
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) segments fused, vermiform, very long, reaching beyond posterior margin of lateral lamellae, with many pits, without lateral plates or pleopods. Pleotelson fused with pleon, without uropods. Antennule and antenna (Figs 3A, 5B) composed of one article each with three setae distally. Oral cone (Figs 3A, 5B) conical, extending beyond surface of cephalon. First to fifth pereopods (Figs 4A, 5B) similar in shape, first pair slightly smaller than others: basis longest; ischium approximately 0.7 times as long as basis; merus fused with carpus; propodus ovate, without setae or spines; dactylus with curved claw.
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</paragraph>
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<caption pageId="2" pageNumber="111">
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<paragraph pageId="2" pageNumber="111">
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Figure 1. A female and male of
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<taxonomicName class="Malacostraca" family="Dajidae" genus="Aspidophryxus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Aspidophryxus izuensis" order="Isopoda" pageId="2" pageNumber="111" phylum="Arthropoda" rank="species" species="izuensis">Aspidophryxus izuensis</taxonomicName>
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sp. n. on the carapace of the mysid
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<taxonomicName class="Malacostraca" family="Mysidae" genus="Mysidella" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Mysidella hoshinoi" order="Mysida" pageId="2" pageNumber="111" phylum="Arthropoda" rank="species" species="hoshinoi">Mysidella hoshinoi</taxonomicName>
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, Akino-hama, Izu-Oshima Island, Sagami Sea, Japan, 1 January 2015, 35 m depth, habitus in situ, photographed by O. Hoshino.
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</paragraph>
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</caption>
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<caption pageId="2" pageNumber="111">
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<paragraph pageId="2" pageNumber="111">
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Figure 2.
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<taxonomicName class="Malacostraca" family="Dajidae" genus="Aspidophryxus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Aspidophryxus izuensis" order="Isopoda" pageId="2" pageNumber="111" phylum="Arthropoda" rank="species" species="izuensis">Aspidophryxus izuensis</taxonomicName>
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sp. n., holotype female: A habitus, dorsal B habitus, ventral. Scale bar 500
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<normalizedToken originalValue="μm">μm</normalizedToken>
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. Abbreviation: pl, pleon.
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</paragraph>
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</caption>
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<caption pageId="2" pageNumber="111">
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<paragraph pageId="2" pageNumber="111">
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Figure 3.
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<taxonomicName class="Malacostraca" family="Dajidae" genus="Aspidophryxus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Aspidophryxus izuensis" order="Isopoda" pageId="2" pageNumber="111" phylum="Arthropoda" rank="species" species="izuensis">Aspidophryxus izuensis</taxonomicName>
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sp. n., A holotype female
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<normalizedToken originalValue="B–D">B-D</normalizedToken>
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allotype male (KMNH IvR 500911): A cephalon, ventral B habitus, lateral C cephalon and first and second pereomeres, ventral D pleotelson, dorsal. Scale bars 100
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<normalizedToken originalValue="μm">μm</normalizedToken>
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. Abbreviations: ant-1, antennule; ant-2, antenna; o. c, coral cone; md, mandible; u. p, uropod.
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</paragraph>
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</caption>
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<caption pageId="2" pageNumber="111">
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<paragraph pageId="2" pageNumber="111">
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Figure 4.
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<taxonomicName class="Malacostraca" family="Dajidae" genus="Aspidophryxus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Aspidophryxus izuensis" order="Isopoda" pageId="2" pageNumber="111" phylum="Arthropoda" rank="species" species="izuensis">Aspidophryxus izuensis</taxonomicName>
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sp. n., A holotype female
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<normalizedToken originalValue="B–F">B-F</normalizedToken>
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allotype male (KMNH IvR 500911): A left fifth pereopod, dorsal B left first pereopod, lateral; C left second pereopod, lateral D left fifth pereopod, lateral E left sixth pereopod, lateral F left seventh pereopod, medial. Scale bar 100
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<normalizedToken originalValue="μm">μm</normalizedToken>
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.
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</paragraph>
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</caption>
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<caption pageId="2" pageNumber="111">
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<paragraph pageId="2" pageNumber="111">
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Figure 5.
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<taxonomicName class="Malacostraca" family="Dajidae" genus="Aspidophryxus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Aspidophryxus izuensis" order="Isopoda" pageId="2" pageNumber="111" phylum="Arthropoda" rank="species" species="izuensis">Aspidophryxus izuensis</taxonomicName>
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sp. n., A paratype female (KMNH IvR 500909) and male (KMNH IvR 500912) B, C, E, F paratype female (KMNH IvR 500909) D paratype male (KMNH IvR 500912). A habitus, female, ventral, male, dorsal; B cephalon and pereopods, ventral C pleon and digitate extensions of oostegites, ventral D habitus (clinging to female pleon by seventh pereopods), lateral E pleon and digitate extensions of oostegites, ventral; F female pleon, ventral. Scale bars A, 500
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<normalizedToken originalValue="μm">μm</normalizedToken>
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;
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<normalizedToken originalValue="B–D">B-D</normalizedToken>
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, 100
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<normalizedToken originalValue="µm">µm</normalizedToken>
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. Abbreviations: ant-1, antennule; ant-2, antenna; o. c, oral cone; pl, pleon.
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</paragraph>
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</caption>
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</subSubSection>
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<subSubSection lastPageId="3" lastPageNumber="112" pageId="2" pageNumber="111" type="description">
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<paragraph pageId="2" pageNumber="111">Description of male.</paragraph>
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<paragraph lastPageId="3" lastPageNumber="112" pageId="2" pageNumber="111">
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Body (Figs 3B, 5D) curved ventrally; scattered setae present dorsally. Cephalon (Fig. 3B, C) without eyes, fused with first pereomere; anterior margin
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<pageBreakToken pageId="3" pageNumber="112" start="start">convex</pageBreakToken>
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. Second to seventh pereomeres (Fig. 3B) separated, subequal in width. Pleon (Fig. 3B, D) unsegmented, slit-like anal cone between uropods. Uropods (Fig. 3B, D) well developed, long, composed of protopod and inner and outer ramus: protopod cylindrical, without setae; inner and outer ramus shorter than protopod, each with two setae distally. Antennule (Fig. 3C) composed of single triangular article, with two distal and two lateral setae. Antenna (Fig. 3C, D) composed of eight articles: first article largest; second article as long as first article; third article shorter than second article; fourth to seventh articles each with one or two setae distally; eighth article with one short and one long setae and one aesthetasc apically. Oral cone (Fig. 3C): pair of mandibular gnathobases protruding from mouth opening. First pereopod (Fig. 4B) smaller than all other pereopods, basis longest; ischium 0.7 times as long as basis; merus trapezoidal; carpus smallest; propodus ovate, without setae; dactylus short, curved inward. Second to fifth pereopods (Fig. 4C, D) similar in shape: basis longest; ischium shorter than basis; merus trapezoidal; carpus smallest, with one seta distally; propodus ovate, with one projection proximoventrally; dactylus long, slightly curved inward, with one seta ventrally. Sixth pereopod (Fig. 4E) propodus slightly smaller than those of second to fifth pereopods. Seventh pereopod (Fig. 4F) longer than all other pereopods: propodus smaller than propodus of sixth pereopod; dactylus short, curved inward, without setae.
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</paragraph>
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</subSubSection>
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<subSubSection pageId="4" pageNumber="113" type="color in life">
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<paragraph pageId="4" pageNumber="113">
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<pageBreakToken pageId="4" pageNumber="113" start="start">Color</pageBreakToken>
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in life.
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</paragraph>
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<paragraph pageId="4" pageNumber="113">Female (Figs 1; see Fig. 2A) whitish and translucent, with six transverse translucent light orange bands dorsally. Male (Fig. 1) whitish and translucent.</paragraph>
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</subSubSection>
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<subSubSection lastPageId="7" lastPageNumber="116" pageId="4" pageNumber="113" type="remarks">
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<paragraph pageId="4" pageNumber="113">Remarks.</paragraph>
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<paragraph lastPageId="5" lastPageNumber="114" pageId="4" pageNumber="113">
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<taxonomicName class="Malacostraca" family="Dajidae" genus="Aspidophryxus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Aspidophryxus izuensis" order="Isopoda" pageId="4" pageNumber="113" phylum="Arthropoda" rank="species" species="izuensis">Aspidophryxus izuensis</taxonomicName>
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sp. n. can be identified by the following combination of characters: body length and width subequal, anteriorly widest in female; frontal
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<pageBreakToken pageId="5" pageNumber="114" start="start">margin</pageBreakToken>
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of the cephalon exceeding anterior margins of lateral lamellae in female; pleon unsegmented, vermiform, very long in female; uropod composed of protopod and inner and outer ramus in male.
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</paragraph>
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<paragraph lastPageId="6" lastPageNumber="115" pageId="5" pageNumber="114">
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<taxonomicName class="Malacostraca" family="Dajidae" genus="Aspidophryxus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Aspidophryxus izuensis" order="Isopoda" pageId="5" pageNumber="114" phylum="Arthropoda" rank="species" species="izuensis">Aspidophryxus izuensis</taxonomicName>
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is most similar to
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<taxonomicName class="Malacostraca" family="Dajidae" genus="Aspidophryxus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Aspidophryxus discoformis" order="Isopoda" pageId="5" pageNumber="114" phylum="Arthropoda" rank="species" species="discoformis">Aspidophryxus discoformis</taxonomicName>
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Boyko & Williams, 2012, from Caribbean waters (
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<bibRefCitation author="Boyko, CB" journalOrPublisher="Acta Parasitologica" pageId="8" pageNumber="117" pagination="397 - 401" title="A new species of Aspidophryxus G. O. Sars, 1883 (Crustacea, Isopoda, Dajidae) from Caribbean mysid shrimp." url="https://doi.org/10.2478/s11686-012-0052-3" volume="57" year="2012">Boyko and Williams 2012</bibRefCitation>
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) in having the frontal margin of cephalon exceeding the anterior margins of the lateral lamellae and body length and width being subequal.
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<taxonomicName class="Malacostraca" family="Dajidae" genus="Aspidophryxus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Aspidophryxus izuensis" order="Isopoda" pageId="5" pageNumber="114" phylum="Arthropoda" rank="species" species="izuensis">Aspidophryxus izuensis</taxonomicName>
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, however, differs from
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<taxonomicName class="Malacostraca" family="Dajidae" genus="Aspidophryxus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Aspidophryxus discoformis" order="Isopoda" pageId="5" pageNumber="114" phylum="Arthropoda" rank="species" species="discoformis">Aspidophryxus discoformis</taxonomicName>
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by the following characters (those of
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<taxonomicName class="Malacostraca" family="Dajidae" genus="Aspidophryxus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Aspidophryxus discoformis" order="Isopoda" pageId="5" pageNumber="114" phylum="Arthropoda" rank="species" species="discoformis">Aspidophryxus discoformis</taxonomicName>
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in parentheses): body widest at anterior
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<pageBreakToken pageId="6" pageNumber="115" start="start">part</pageBreakToken>
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in female (widest at middle); pleon very long, reaching beyond posterior margin of lateral lamellae in female (moderately short, not reaching beyond posterior margin of lateral lamellae); frontal part of cephalon long, half as long as wide in female (short, 0.12 times as long as wide); uropods well developed, long, composed of protopod and inner and outer ramus in male (rudimentary, short, uniramous).
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</paragraph>
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<paragraph lastPageId="7" lastPageNumber="116" pageId="6" pageNumber="115">
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Dajid males are found attached to the pleon, lateral plate, or pleopods of the females by the pereopods (
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<bibRefCitation author="Giard, A" journalOrPublisher="Bulletin Scientifique de la France et de la Belgique" pageId="8" pageNumber="117" pagination="252 - 292" title="Sur les Epicarides de la famille des Dajidae." volume="20" year="1889">Giard and Bonnier 1889</bibRefCitation>
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;
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<bibRefCitation author="Shimomura, M" journalOrPublisher="Systematic Parasitology" pageId="8" pageNumber="117" pagination="39 - 57" title="Prodajuscurviabdonalis n. sp. (Isopoda: Epicaridea: Dajidae), an ectoparasite of mysids, with notes on morphaological changes, behavior and life cycle." url="https://doi.org/10.1007/s11230-004-1375-8" volume="60" year="2005">Shimomura et al. 2005</bibRefCitation>
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). In
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<taxonomicName class="Malacostraca" family="Dajidae" genus="Aspidophryxus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Aspidophryxus izuensis" order="Isopoda" pageId="6" pageNumber="115" phylum="Arthropoda" rank="species" species="izuensis">Aspidophryxus izuensis</taxonomicName>
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, the
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<pageBreakToken pageId="7" pageNumber="116" start="start">males</pageBreakToken>
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cling to near the end of the pleon of females by seventh pereopods. The pleon of the female has scale-like wrinkles and many pits on its surface; these features might enable males to more easily cling to the surface. This is one of the first reports on how males attach to the pleon of females in the
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<taxonomicName family="Dajidae" lsidName="" pageId="7" pageNumber="116" rank="family">Dajidae</taxonomicName>
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.
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</paragraph>
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</subSubSection>
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<subSubSection pageId="7" pageNumber="116" type="etymology">
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<paragraph pageId="7" pageNumber="116">Etymology.</paragraph>
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<paragraph pageId="7" pageNumber="116">The new species is named after the type locality.</paragraph>
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</subSubSection>
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</treatment>
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</document> |