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<document id="2A645E46F41C6559902AF5FDD6DC3E2E" ID-CLB-Dataset="54530" ID-DOI="10.1093/zoolinnean/zlac105" ID-GBIF-Dataset="4a724d97-0468-403d-b52d-4f44d0e3d3e9" ID-ISSN="0024-4082" ID-Zenodo-Dep="8011009" ID-ZooBank="A9963447-9E12-4AAC-9CC3-5D165A757EF7" IM.bibliography_approvedBy="diego" IM.illustrations_approvedBy="diego" IM.materialsCitations_approvedBy="felipe" IM.metadata_approvedBy="felipe" IM.tables_approvedBy="diego" IM.taxonomicNames_approvedBy="felipe" IM.treatments_approvedBy="diego" checkinTime="1685958807152" checkinUser="plazi" docAuthor="Huys, Rony, Savchenko, Alexandra S. &amp; Kosobokova, Ksenia N." docDate="2023" docId="039587FE1D72FFDCFF1FB9E031A3F9C4" docLanguage="en" docName="zlac105.pdf" docOrigin="Zoological Journal of the Linnean Society 198 (2)" docSource="http://dx.doi.org/10.1093/zoolinnean/zlac105" docStyle="DocumentStyle:36B3BD6A90C22AB4F7F465C853188CC8.7:ZoolJLinnSoc.2017-2023.journal_article" docStyleId="36B3BD6A90C22AB4F7F465C853188CC8" docStyleName="ZoolJLinnSoc.2017-2023.journal_article" docStyleVersion="7" docTitle="Holophryxus alaskensis Richardson 1905" docType="treatment" docVersion="5" lastPageNumber="632" masterDocId="FFACFF861D55FFF4FFAFB9253035FFB8" masterDocTitle="Discovery of a new species and host record of Holophryxus Richardson, 1905 (Isopoda: Dajidae) from the central Arctic: a model of enhanced descriptive standards for epicaridean isopods" masterLastPageNumber="649" masterPageNumber="592" pageNumber="631" updateTime="1699513079146" updateUser="plazi">
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<mods:title id="3E1DB9668391B51625E2BC2D466EB961">Discovery of a new species and host record of Holophryxus Richardson, 1905 (Isopoda: Dajidae) from the central Arctic: a model of enhanced descriptive standards for epicaridean isopods</mods:title>
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<mods:namePart id="D16303E2A145169F12187AA7F548CDF4">Huys, Rony</mods:namePart>
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<mods:namePart id="7CFAACBFBD97D9F89A58C8C1B0BEC78E">Savchenko, Alexandra S.</mods:namePart>
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<mods:namePart id="F8D5631D9D85E03EFE3C58187D4DE5FF">Kosobokova, Ksenia N.</mods:namePart>
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<mods:title id="62EA0E2F7A23492C862817F97EFA19B0">Zoological Journal of the Linnean Society</mods:title>
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<mods:date id="EA7F2F4CACF63C3A26FD5EED3CB13E2F">2023</mods:date>
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<treatment id="039587FE1D72FFDCFF1FB9E031A3F9C4" ID-DOI="http://doi.org/10.5281/zenodo.8011035" ID-GBIF-Taxon="209669774" ID-Zenodo-Dep="8011035" LSID="urn:lsid:plazi:treatment:039587FE1D72FFDCFF1FB9E031A3F9C4" httpUri="http://treatment.plazi.org/id/039587FE1D72FFDCFF1FB9E031A3F9C4" lastPageId="40" lastPageNumber="632" pageId="39" pageNumber="631">
<subSubSection id="C32665631D72FFD3FF1FB9E032ECFF63" box="[176,729,196,221]" pageId="39" pageNumber="631" type="nomenclature">
<paragraph id="8B8336E81D72FFD3FF1FB9E032ECFF63" blockId="39.[176,729,196,221]" box="[176,729,196,221]" pageId="39" pageNumber="631">
<heading id="D0CB81841D72FFD3FF1FB9E032ECFF63" box="[176,729,196,221]" centered="true" fontSize="9" level="2" pageId="39" pageNumber="631" reason="2">
<taxonomicName id="4C3C4D6B1D72FFD3FF1FB9E032ECFF63" ID-CoL="3M9GB" authority="RICHARDSON, 1905 A" authorityName="Richardson" authorityYear="1905" box="[176,729,196,221]" class="Malacostraca" family="Dajidae" genus="Holophryxus" kingdom="Animalia" order="Isopoda" pageId="39" pageNumber="631" phylum="Arthropoda" rank="species" species="alaskensis">
<emphasis id="B948EAFA1D72FFD3FF1FB9E031DFFF63" box="[176,490,197,220]" italics="true" pageId="39" pageNumber="631">
<smallCapsWord id="8D65A0341D72FFD3FF1FB9E0316CFF64" baselines="214,214" box="[176,345,197,220]" lowerCaseFontSize="8" mainFontSize="10" normCase="title" normString="Holophryxus" pageId="39" pageNumber="631">HOLOPHRYXUS</smallCapsWord>
<smallCapsWord id="8D65A0341D72FFD3FECEB9E231DFFF63" baselines="214" box="[353,490,199,219]" lowerCaseFontSize="8" mainFontSize="10" normCase="lower" normString="alaskensis" pageId="39" pageNumber="631">ALASKENSIS</smallCapsWord>
</emphasis>
<smallCapsWord id="8D65A0341D72FFD3FE5EB9E132B0FF65" baselines="215,214" box="[497,645,196,221]" lowerCaseFontSize="8" mainFontSize="10" normCase="title" normString="Richardson" pageId="39" pageNumber="631">RICHARDSON</smallCapsWord>
, 1905
<smallCapsWord id="8D65A0341D72FFD3FD65B9E232ECFF63" baselines="214" box="[714,729,199,219]" lowerCaseFontSize="8" mainFontSize="10" normCase="lower" normString="a" pageId="39" pageNumber="631">A</smallCapsWord>
</taxonomicName>
</heading>
</paragraph>
</subSubSection>
<subSubSection id="C32665631D72FFD3FF3EB82830D7FCB7" pageId="39" pageNumber="631" type="reference_group">
<paragraph id="8B8336E81D72FFD3FF3EB8283103FEE7" blockId="39.[145,760,268,352]" pageId="39" pageNumber="631">
<emphasis id="B948EAFA1D72FFD3FF3EB8283125FE9A" box="[145,272,269,290]" italics="true" pageId="39" pageNumber="631">Synonyms:</emphasis>
<taxonomicName id="4C3C4D6B1D72FFD3FE8AB82930FCFEF8" ID-CoL="3M9GC" authority="Richardson, 1908" authorityName="Richardson" authorityYear="1908" class="Malacostraca" family="Dajidae" genus="Holophryxus" kingdom="Animalia" order="Isopoda" pageId="39" pageNumber="631" phylum="Arthropoda" rank="species" species="californiensis">
<emphasis id="B948EAFA1D72FFD3FE8AB8293256FE99" box="[293,611,268,289]" italics="true" pageId="39" pageNumber="631">Holophryxus californiensis</emphasis>
<bibRefCitation id="EFAD4B191D72FFD3FDC3B82930FCFEF8" author="Richardson H" pageId="39" pageNumber="631" pagination="689 - 696" refId="ref42508" refString="Richardson H. 1908. On some isopods of the family Dajidae from the northwest Pacific Ocean, with descriptions of a new genus and two new species. Proceedings of the United States National Museum 33: 689 - 696." type="journal article" year="1908">Richardson, 1908</bibRefCitation>
</taxonomicName>
;
<taxonomicName id="4C3C4D6B1D72FFD3FF78B80E32D6FEF9" ID-CoL="3NV76" authority="Nierstrasz &amp; Brender" authorityName="Nierstrasz &amp; Brender" box="[215,739,299,321]" class="Malacostraca" family="Dajidae" genus="Hypodajus" kingdom="Animalia" order="Isopoda" pageId="39" pageNumber="631" phylum="Arthropoda" rank="species" species="georgiensis">
<emphasis id="B948EAFA1D72FFD3FF78B80E31E9FEF9" box="[215,476,299,321]" italics="true" pageId="39" pageNumber="631">Hypodajus georgiensis</emphasis>
Nierstrasz &amp; Brender
</taxonomicName>
à Brandis, 1931.
</paragraph>
<paragraph id="8B8336E81D72FFD3FF3EB8AD3111FE04" blockId="39.[145,760,392,445]" pageId="39" pageNumber="631">
<emphasis id="B948EAFA1D72FFD3FF3EB8AD31BEFE25" box="[145,395,392,413]" italics="true" pageId="39" pageNumber="631">Original description:</emphasis>
<bibRefCitation id="EFAD4B191D72FFD3FE38B8AD324AFE26" author="Richardson H" box="[407,639,392,414]" pageId="39" pageNumber="631" pagination="211 - 221" refId="ref42455" refString="Richardson H. 1905 a. Isopods from the Alaska Salmon Investigation. Bulletin of the Bureau of Fisheries 24: 211 - 221." type="journal article" year="1905">Richardson (1905a)</bibRefCitation>
: 221–117, figs 8–10 (
<specimenCount id="9D3AFD611D72FFD3FEAAB8813121FE04" box="[261,276,420,444]" pageId="39" pageNumber="631" type="female">♀</specimenCount>
).
</paragraph>
<paragraph id="8B8336E81D72FFD3FF3EB8C330D7FCB7" blockId="39.[145,762,486,784]" pageId="39" pageNumber="631">
<emphasis id="B948EAFA1D72FFD3FF3EB8C33199FE43" box="[145,428,486,507]" italics="true" pageId="39" pageNumber="631">Additional descriptions:</emphasis>
<bibRefCitation id="EFAD4B191D72FFD3FE16B8C332A3FE44" author="Richardson H" box="[441,662,486,508]" pageId="39" pageNumber="631" pagination="1 - 727" refId="ref42480" refString="Richardson H. 1905 b. A monograph on the isopods of North America. Bulletin of the United States National Museum 54: 1 - 727." type="journal article" year="1905">Richardson (1905b</bibRefCitation>
—as
<taxonomicName id="4C3C4D6B1D72FFD3FD7DB8C3313EFDA1" ID-CoL="6LXJV" authorityName="Richardson" authorityYear="1905" class="Malacostraca" family="Dajidae" genus="Holophryxus" kingdom="Animalia" order="Isopoda" pageId="39" pageNumber="631" phylum="Arthropoda" rank="species" species="alascensis">
<emphasis id="B948EAFA1D72FFD3FD7DB8C3313EFDA1" italics="true" pageId="39" pageNumber="631">Ho. alascensis</emphasis>
</taxonomicName>
): 576–577, figs 639–641 (
<specimenCount id="9D3AFD611D72FFD3FDE7BB243262FDA1" box="[584,599,513,537]" pageId="39" pageNumber="631" type="female">♀</specimenCount>
).
<bibRefCitation id="EFAD4B191D72FFD3FDDFBB2130E7FD80" author="Richardson H" pageId="39" pageNumber="631" pagination="689 - 696" refId="ref42508" refString="Richardson H. 1908. On some isopods of the family Dajidae from the northwest Pacific Ocean, with descriptions of a new genus and two new species. Proceedings of the United States National Museum 33: 689 - 696." type="journal article" year="1908">Richardson (1908</bibRefCitation>
—
<taxonomicName id="4C3C4D6B1D72FFD3FF43BB01318FFD80" ID-CoL="3M9GC" authorityName="Richardson" authorityYear="1908" box="[236,442,547,569]" class="Malacostraca" family="Dajidae" genus="Holophryxus" kingdom="Animalia" order="Isopoda" pageId="39" pageNumber="631" phylum="Arthropoda" rank="species" species="californiensis">
<emphasis id="B948EAFA1D72FFD3FF43BB01318FFD80" box="[236,442,547,569]" italics="true" pageId="39" pageNumber="631">Ho. californiensis</emphasis>
</taxonomicName>
): 692–694, figs 4, 5 (
<specimenCount id="9D3AFD611D72FFD3FD1ABB0532F1FD80" box="[693,708,544,568]" pageId="39" pageNumber="631" type="female">♀</specimenCount>
and
<specimenCount id="9D3AFD611D72FFD3FF3EBB1A3094FDEF" box="[145,161,575,599]" pageId="39" pageNumber="631" type="male">♂</specimenCount>
). Nierstrasz &amp; Brender à Brandis (1931—as
<taxonomicName id="4C3C4D6B1D72FFD3FD6CBB673127FDCE" ID-CoL="3NV76" authority="Nierstrasz &amp; Brender" authorityName="Nierstrasz &amp; Brender" class="Malacostraca" family="Dajidae" genus="Hypodajus" kingdom="Animalia" order="Isopoda" pageId="39" pageNumber="631" phylum="Arthropoda" rank="species" species="georgiensis">
<emphasis id="B948EAFA1D72FFD3FD6CBB673127FDCE" italics="true" pageId="39" pageNumber="631">Hyp. georgiensis</emphasis>
</taxonomicName>
): 212, 213, figs 106–110 (
<specimenCount id="9D3AFD611D72FFD3FD93BB78327EFDCD" box="[572,587,605,629]" pageId="39" pageNumber="631" type="female">♀</specimenCount>
and
<specimenCount id="9D3AFD611D72FFD3FD29BB7832A3FDCD" box="[646,662,605,629]" pageId="39" pageNumber="631" type="male">♂</specimenCount>
).
<bibRefCitation id="EFAD4B191D72FFD3FD02BB4530E9FD2D" author="Butler TH" pageId="39" pageNumber="631" pagination="971 - 976" refId="ref38108" refString="Butler TH. 1964. Redescription of the parasitic isopod Holophryxus alaskensis Richardson, and a note on its synonymy. Journal of the Fisheries Research Board of Canada 21: 971 - 976." type="journal article" year="1964">Butler (1964)</bibRefCitation>
: 973–975, figs 1–3 (adult and immature
<specimenCount id="9D3AFD611D72FFD3FD7BBB5932C7FD2C" box="[724,754,636,660]" pageId="39" pageNumber="631" type="female">♀♀</specimenCount>
, and
<specimenCount id="9D3AFD611D72FFD3FF6ABBBE30E0FD0B" box="[197,213,667,691]" pageId="39" pageNumber="631" type="male">♂</specimenCount>
).
<bibRefCitation id="EFAD4B191D72FFD3FF42BBBB3234FD0B" author="Coyle KO &amp; Mueller GJ" box="[237,513,670,692]" pageId="39" pageNumber="631" pagination="1438 - 1443" refId="ref38579" refString="Coyle KO, Mueller GJ. 1981. Larval and juvenile stages of the isopod Holophryxus alaskensis (Epicarida, Dajidae) parasitic on decapods. Canadian Journal of Fisheries and Aquatic Sciences 38: 1438 - 1443." type="journal article" year="1981">Coyle &amp; Mueller (1981)</bibRefCitation>
: 1439–1441, figs 1, 2 (epicaridium, microniscus, cryptoniscus and juvenile female).
<bibRefCitation id="EFAD4B191D72FFD3FF5ABBFE3210FD49" author="Boyko CB &amp; Williams JD" box="[245,549,731,753]" pageId="39" pageNumber="631" pagination="111 - 121" refId="ref37756" refString="Boyko CB, Williams JD. 2021 b. New records of species of Holophryxus Richardson, 1905 (Crustacea: Isopoda: Dajidae) from the Atlantic and Pacific Oceans with comments on taxonomic issues in the genus. Bulletin of the Peabody Museum of Natural History 62: 111 - 121." type="journal article" year="2021">Boyko &amp; Williams (2021b)</bibRefCitation>
: 112–114, fig. 1 (
<specimenCount id="9D3AFD611D72FFD3FD45BBFD32CCFD48" box="[746,761,728,752]" pageId="39" pageNumber="631" type="female">♀</specimenCount>
and
<specimenCount id="9D3AFD611D72FFD3FF6DBBD230E7FCB7" box="[194,210,759,783]" pageId="39" pageNumber="631" type="male">♂</specimenCount>
).
</paragraph>
</subSubSection>
<subSubSection id="C32665631D72FFD3FF3EBA1C3146FC34" pageId="39" pageNumber="631" type="biology_ecology">
<paragraph id="8B8336E81D72FFD3FF3EBA1C3146FC34" blockId="39.[145,760,824,908]" pageId="39" pageNumber="631">
<emphasis id="B948EAFA1D72FFD3FF3EBA1C322BFCF6" box="[145,542,824,846]" italics="true" pageId="39" pageNumber="631">Hosts: Pasiphaea pacifica</emphasis>
(P l e o c y e m a t a,
<taxonomicName id="4C3C4D6B1D72FFD3FF3EBA72311BFCD5" box="[145,302,855,877]" class="Malacostraca" family="Pasiphaeidae" higherTaxonomySource="GBIF" kingdom="Animalia" order="Decapoda" pageId="39" pageNumber="631" phylum="Arthropoda" rank="family">Pasiphaeidae</taxonomicName>
);
<taxonomicName id="4C3C4D6B1D72FFD3FEEDBA7232CDFCD4" authority="(Esterly, 1913)" baseAuthorityName="Esterly" baseAuthorityYear="1913" box="[322,760,855,877]" class="Hexanauplia" family="Euchaetidae" genus="Paraeuchaeta" kingdom="Animalia" order="Calanoida" pageId="39" pageNumber="631" phylum="Arthropoda" rank="species" species="elongata">
<emphasis id="B948EAFA1D72FFD3FEEDBA72327CFCD4" box="[322,585,855,876]" italics="true" pageId="39" pageNumber="631">Paraeuchaeta elongata</emphasis>
(
<bibRefCitation id="EFAD4B191D72FFD3FDF6BA7232C4FCD4" author="Esterly CO" box="[601,753,855,877]" pageId="39" pageNumber="631" pagination="181 - 196" refId="ref39039" refString="Esterly CO. 1913. Fourth taxonomic report on the Copepoda of the San Diego region. UniVersity of California Publications in Zoology 11 (10): 181 - 196, plates 10 - 12." type="journal article" year="1913">Esterly, 1913</bibRefCitation>
)
</taxonomicName>
(intermediate host).
</paragraph>
</subSubSection>
<subSubSection id="C32665631D72FFD3FF3EBA9132B6FC71" box="[145,643,948,970]" pageId="39" pageNumber="631" type="distribution">
<paragraph id="8B8336E81D72FFD3FF3EBA9132B6FC71" blockId="39.[145,643,948,970]" box="[145,643,948,970]" pageId="39" pageNumber="631">
<emphasis id="B948EAFA1D72FFD3FF3EBA913117FC71" box="[145,290,948,969]" italics="true" pageId="39" pageNumber="631">Distribution:</emphasis>
North Pacific Ocean (
<tableCitation id="C6BE03531D72FFD3FD8FBA913241FC71" box="[544,628,948,970]" captionStart="Table 2" captionStartId="5.[145,209,197,218]" captionTargetBox="[145,1423,372,1870]" captionTargetPageId="5" captionText="Table 2. Distribution and host records of all nominal species of Holophryxus Richardson, 1905a [eight valid and two species inquirendae (Ho. septapodus, Ho. truncatus)]. ‘Unknown’ means that the parasite was found free in the plankton haul, presumably having become secondarily detached from its host, or, alternatively, was found among preserved museum material; ‘w.’ refers to the length of the trawl warp used (wire out) and does not necessarily reflect the depth at which the specimens were collected. Type localities marked by *" httpUri="http://table.plazi.org/id/DF4366601D50FFF1FF3EB9E03319FEE8" pageId="39" pageNumber="631" tableUuid="DF4366601D50FFF1FF3EB9E03319FEE8">Table 2</tableCitation>
).
</paragraph>
</subSubSection>
<subSubSection id="C32665631D72FFD3FF3EBADD34A1FA1B" pageId="39" pageNumber="631" type="diagnosis">
<paragraph id="8B8336E81D72FFD3FF3EBADD32ECFAE7" blockId="39.[145,762,1016,1376]" pageId="39" pageNumber="631">
<emphasis id="B948EAFA1D72FFD3FF3EBADD3265FBB5" box="[145,592,1016,1037]" italics="true" pageId="39" pageNumber="631">
Differential diagnosis:
<taxonomicName id="4C3C4D6B1D72FFD3FE1ABADD3265FBB5" baseAuthorityName="Butler" baseAuthorityYear="1964" box="[437,592,1016,1037]" class="Malacostraca" family="Dajidae" genus="Holophryxus" kingdom="Animalia" order="Isopoda" pageId="39" pageNumber="631" phylum="Arthropoda" rank="genus">Holophryxus</taxonomicName>
</emphasis>
. Body length
<quantity id="4CC49B0D1D72FFD3FF3EBD3230E2FB94" box="[145,215,1047,1069]" metricMagnitude="-3" metricUnit="m" metricValue="6.0" pageId="39" pageNumber="631" unit="mm" value="6.0">6 mm</quantity>
(
<specimenCount id="9D3AFD611D72FFD3FF44BD3130CEFB94" box="[235,251,1044,1068]" pageId="39" pageNumber="631" type="male">♂</specimenCount>
;
<emphasis id="B948EAFA1D72FFD3FEA1BD3D3117FB95" box="[270,290,1048,1069]" italics="true" pageId="39" pageNumber="631">N</emphasis>
= 1) (
<bibRefCitation id="EFAD4B191D72FFD3FEC1BD323273FB94" author="Richardson H" box="[366,582,1047,1069]" pageId="39" pageNumber="631" pagination="689 - 696" refId="ref42508" refString="Richardson H. 1908. On some isopods of the family Dajidae from the northwest Pacific Ocean, with descriptions of a new genus and two new species. Proceedings of the United States National Museum 33: 689 - 696." type="journal article" year="1908">Richardson, 1908</bibRefCitation>
);
<quantity id="4CC49B0D1D72FFD3FDCDBD3232FBFB94" box="[610,718,1047,1069]" metricMagnitude="-2" metricUnit="m" metricValue="1.05" pageId="39" pageNumber="631" unit="mm" value="10.5">10.5 mm</quantity>
(
<specimenCount id="9D3AFD611D72FFD3FD4DBD3132C4FB94" box="[738,753,1044,1068]" pageId="39" pageNumber="631" type="female">♀</specimenCount>
;
<emphasis id="B948EAFA1D72FFD3FF3EBD133090FBF3" box="[145,165,1078,1099]" italics="true" pageId="39" pageNumber="631">N</emphasis>
= 1), about
<quantity id="4CC49B0D1D72FFD3FE85BD13315EFBF3" box="[298,363,1078,1099]" metricMagnitude="-3" metricUnit="m" metricValue="2.0" pageId="39" pageNumber="631" unit="mm" value="2.0">2 mm</quantity>
(
<specimenCount id="9D3AFD611D72FFD3FED5BD1631BFFBF3" box="[378,394,1075,1099]" pageId="39" pageNumber="631" type="male">♂</specimenCount>
;
<emphasis id="B948EAFA1D72FFD3FE38BD13319EFBF3" box="[407,427,1078,1099]" italics="true" pageId="39" pageNumber="631">N</emphasis>
= 1) (Nierstrasz &amp; Brender à Brandis, 1931);
<quantity id="4CC49B0D1D72FFD3FEECBD7131F2FBD2" box="[323,455,1108,1130]" metricMagnitude="-3" metricUnit="m" metricValue="4.9" metricValueMax="5.5" metricValueMin="4.3" pageId="39" pageNumber="631" unit="mm" value="4.9" valueMax="5.5" valueMin="4.3">4.3–5.5 mm</quantity>
(immature
<specimenCount id="9D3AFD611D72FFD3FDE2BD74325EFBD1" box="[589,619,1105,1129]" pageId="39" pageNumber="631" type="female">♀♀</specimenCount>
;
<emphasis id="B948EAFA1D72FFD3FDD8BD7032BEFBD2" box="[631,651,1109,1130]" italics="true" pageId="39" pageNumber="631">N</emphasis>
= 2); 5.5– 12.0 mm (adult
<specimenCount id="9D3AFD611D72FFD3FEFFBD55315BFB30" box="[336,366,1136,1160]" pageId="39" pageNumber="631" type="female">♀♀</specimenCount>
;
<emphasis id="B948EAFA1D72FFD3FED1BD5131A7FB31" box="[382,402,1140,1161]" italics="true" pageId="39" pageNumber="631">N</emphasis>
= 18), 1.9–6.0 mm (
<specimenCount id="9D3AFD611D72FFD3FD2FBD553294FB30" box="[640,673,1136,1160]" pageId="39" pageNumber="631" type="male">♂♂</specimenCount>
;
<emphasis id="B948EAFA1D72FFD3FD1EBD5132F0FB31" box="[689,709,1140,1161]" italics="true" pageId="39" pageNumber="631">N</emphasis>
= 2) (
<bibRefCitation id="EFAD4B191D72FFD3FF35BDB73104FB10" author="Butler TH" box="[154,305,1170,1192]" pageId="39" pageNumber="631" pagination="971 - 976" refId="ref38108" refString="Butler TH. 1964. Redescription of the parasitic isopod Holophryxus alaskensis Richardson, and a note on its synonymy. Journal of the Fisheries Research Board of Canada 21: 971 - 976." type="journal article" year="1964">Butler, 1964</bibRefCitation>
);
<quantity id="4CC49B0D1D72FFD3FEE3BDB731E9FB1F" box="[332,476,1170,1191]" metricMagnitude="-4" metricUnit="m" metricValue="2.5" metricValueMax="3.0" metricValueMin="2.0" pageId="39" pageNumber="631" unit="mm" value="0.25" valueMax="0.3" valueMin="0.2">0.2–0.3 mm</quantity>
(epicaridium),
<quantity id="4CC49B0D1D72FFD3FD32BDB732CDFB1F" box="[669,760,1170,1191]" metricMagnitude="-3" metricUnit="m" metricValue="1.2" pageId="39" pageNumber="631" unit="mm" value="1.2">1.2 mm</quantity>
(cryptoniscus) (
<bibRefCitation id="EFAD4B191D72FFD3FEE6BD953267FB7D" author="Coyle KO &amp; Mueller GJ" box="[329,594,1200,1222]" pageId="39" pageNumber="631" pagination="1438 - 1443" refId="ref38579" refString="Coyle KO, Mueller GJ. 1981. Larval and juvenile stages of the isopod Holophryxus alaskensis (Epicarida, Dajidae) parasitic on decapods. Canadian Journal of Fisheries and Aquatic Sciences 38: 1438 - 1443." type="journal article" year="1981">Coyle &amp; Mueller, 1981</bibRefCitation>
);
<quantity id="4CC49B0D1D72FFD3FDC5BD9532E4FB7E" box="[618,721,1200,1222]" metricMagnitude="-2" metricUnit="m" metricValue="1.3599999999999999" pageId="39" pageNumber="631" unit="mm" value="13.6">13.6 mm</quantity>
(
<specimenCount id="9D3AFD611D72FFD3FD4CBD8832C7FB7D" box="[739,754,1197,1221]" pageId="39" pageNumber="631" type="female">♀</specimenCount>
;
<emphasis id="B948EAFA1D72FFD3FF3EBDF53090FB5D" box="[145,165,1232,1253]" italics="true" pageId="39" pageNumber="631">N</emphasis>
= 1), 2.0 mm (
<specimenCount id="9D3AFD611D72FFD3FEE0BDE9316AFB5C" box="[335,351,1228,1252]" pageId="39" pageNumber="631" type="male">♂</specimenCount>
;
<emphasis id="B948EAFA1D72FFD3FEC1BDF531B7FB5D" box="[366,386,1232,1253]" italics="true" pageId="39" pageNumber="631">N</emphasis>
= 1) (
<bibRefCitation id="EFAD4B191D72FFD3FE69BDEA32DCFB5D" author="Boyko CB &amp; Williams JD" box="[454,745,1231,1253]" pageId="39" pageNumber="631" pagination="111 - 121" refId="ref37756" refString="Boyko CB, Williams JD. 2021 b. New records of species of Holophryxus Richardson, 1905 (Crustacea: Isopoda: Dajidae) from the Atlantic and Pacific Oceans with comments on taxonomic issues in the genus. Bulletin of the Peabody Museum of Natural History 62: 111 - 121." type="journal article" year="2021">Boyko &amp; Williams 2021b</bibRefCitation>
). Colour in life maize (
<specimenCount id="9D3AFD611D72FFD3FE0CBDCE3187FABB" box="[419,434,1259,1283]" pageId="39" pageNumber="631" type="female">♀</specimenCount>
), in alcohol and formalin yellowish white (both sexes) (
<bibRefCitation id="EFAD4B191D72FFD3FDA6BC293297FA9A" author="Butler TH" box="[521,674,1292,1314]" pageId="39" pageNumber="631" pagination="971 - 976" refId="ref38108" refString="Butler TH. 1964. Redescription of the parasitic isopod Holophryxus alaskensis Richardson, and a note on its synonymy. Journal of the Fisheries Research Board of Canada 21: 971 - 976." type="journal article" year="1964">Butler, 1964</bibRefCitation>
); after preservation uniformly light yellow (
<specimenCount id="9D3AFD611D72FFD3FDEABC0D3261FAF8" box="[581,596,1320,1344]" pageId="39" pageNumber="631" type="female">♀</specimenCount>
) (
<bibRefCitation id="EFAD4B191D72FFD3FDC2BC0E30E0FAE7" author="Richardson H" pageId="39" pageNumber="631" pagination="211 - 221" refId="ref42455" refString="Richardson H. 1905 a. Isopods from the Alaska Salmon Investigation. Bulletin of the Bureau of Fisheries 24: 211 - 221." type="journal article" year="1905">Richardson, 1905a</bibRefCitation>
); canary yellow in life (
<specimenCount id="9D3AFD611D72FFD3FE70BC6231DBFAE7" box="[479,494,1351,1375]" pageId="39" pageNumber="631" type="female">♀</specimenCount>
) (
<bibRefCitation id="EFAD4B191D72FFD3FDAABC6F32FFFAE7" author="Richardson H" box="[517,714,1354,1376]" pageId="39" pageNumber="631" pagination="689 - 696" refId="ref42508" refString="Richardson H. 1908. On some isopods of the family Dajidae from the northwest Pacific Ocean, with descriptions of a new genus and two new species. Proceedings of the United States National Museum 33: 689 - 696." type="journal article" year="1908">Richardson, 1908</bibRefCitation>
).
</paragraph>
<paragraph id="8B8336E81D72FFD3FF3EBCAC35A7FE68" blockId="39.[145,761,1416,1898]" lastBlockId="39.[809,1426,197,464]" pageId="39" pageNumber="631">
<emphasis id="B948EAFA1D72FFD3FF3EBCAC313DFA26" box="[145,264,1417,1438]" italics="true" pageId="39" pageNumber="631">FEMALE:</emphasis>
Body oblong-ovate, about 1.8–2.3 times as long as maximum width. Cephalon only slightly demarcated from pereon in dorsal aspect by constriction bilaterally and transverse surface fold dorsally; dorsal prominence with emarginate (bilobed) anterior margin; ventral cephalic ridge partly discernible in dorsal aspect, slightly arched, about 0.35 times as long as maximum width, anterior margin slightly sinuous, without paired pit organs; posterolateral corners of cephalic ridge with rounded processes, representing coxal plates of incorporated first pereonite. Maxilliped present, bilobate and irregulary shaped. Median sternal plate presumably with paired posteriorly directed appendices. Pereon with five pairs of incubatory plates; oostegite 1 slightly bilobate, medial projection on proximal lobe unconfirmed but probably present; oostegite 5 unilobate, covering 62–63% of ventral side of body, posterior margin with 10–11 setular extensions. Coxal plates of pereopods 2–5 expressed as rounded processes on lateroventral margins of pereon, separated by transverse folds; those of pereopod 5 weakly developed. Posterior part of pereon with pair of ventrolateral papillae near outer distal corners of fifth incubatory plates. Pleon clearly demarcated from pereon; about 17% of total body length; broadly conical.
</paragraph>
<paragraph id="8B8336E81D72FFD3FC86B8DC3461FC63" blockId="39.[809,1425,505,987]" pageId="39" pageNumber="631">
<emphasis id="B948EAFA1D72FFD3FC86B8DC33B5FDB6" box="[809,896,505,526]" italics="true" pageId="39" pageNumber="631">MALE:</emphasis>
Body elongate, about 2.4–2.6 times as long as maximum width, dorsoventrally flattened. Cephalon completely fused to first pereonite, forming cephalothorax; original segmentation marked by dorsal groove and weak lobate extensions at posterolateral corners; distinctly wider than long, clearly narrower than pereon; anterior margin slightly rounded or almost straight. Antennule with lobate base but no indication of flagellum. Antenna extending to at least posterior margin of first (incorporated) pereonite; segmentation unconfirmed. Pereonites 2–6 completely separated, pereonite 7 narrowest, almost completely fused dorsally with pleon; lateral margins of pereonites 2–7 rounded. Pleon oblong-conical, markedly narrower than pereonite 7, representing 30–38% of body length; posterior margin rounded.
</paragraph>
<paragraph id="8B8336E81D72FFD3FC86BADB34A1FA1B" blockId="39.[809,1425,1022,1443]" pageId="39" pageNumber="631">
<emphasis id="B948EAFA1D72FFD3FC86BADB3399FBAB" box="[809,940,1022,1043]" italics="true" pageId="39" pageNumber="631">Variability:</emphasis>
<bibRefCitation id="EFAD4B191D72FFD3FC17BADB349FFBAC" author="Richardson H" box="[952,1194,1022,1044]" pageId="39" pageNumber="631" pagination="211 - 221" refId="ref42455" refString="Richardson H. 1905 a. Isopods from the Alaska Salmon Investigation. Bulletin of the Bureau of Fisheries 24: 211 - 221." type="journal article" year="1905">Richardson’s (1905a)</bibRefCitation>
<typeStatus id="5487884A1D72FFD3FB1DBADA34D1FBAC" box="[1202,1252,1023,1044]" pageId="39" pageNumber="631">type</typeStatus>
specimens are markedly stouter (1.4 times as long as maximum width) and less symmetrical than the females examined by Nierstrasz &amp; Brender à Brandis (1931) and
<bibRefCitation id="EFAD4B191D72FFD3FCF4BD5C33C0FB37" author="Butler TH" box="[859,1013,1145,1167]" pageId="39" pageNumber="631" pagination="971 - 976" refId="ref38108" refString="Butler TH. 1964. Redescription of the parasitic isopod Holophryxus alaskensis Richardson, and a note on its synonymy. Journal of the Fisheries Research Board of Canada 21: 971 - 976." type="journal article" year="1964">Butler (1964)</bibRefCitation>
. The latter attributed the variation in body shape to different stages in maturation, with the stout body form being associated with the attainment of sexual maturity. Although this may explain the significant difference in length/width ratio, we believe excessive pressure during mounting also contributed to the discrepancy [as revealed by all three habitus views in
<bibRefCitation id="EFAD4B191D72FFD3FC57BC6A34C7FADD" author="Richardson H" box="[1016,1266,1359,1381]" pageId="39" pageNumber="631" pagination="211 - 221" refId="ref42455" refString="Richardson H. 1905 a. Isopods from the Alaska Salmon Investigation. Bulletin of the Bureau of Fisheries 24: 211 - 221." type="journal article" year="1905">Richardson’s (1905a)</bibRefCitation>
description].
<bibRefCitation id="EFAD4B191D72FFD3FC86BC4B33FCFA3C" author="Butler TH" box="[809,969,1390,1412]" pageId="39" pageNumber="631" pagination="971 - 976" refId="ref38108" refString="Butler TH. 1964. Redescription of the parasitic isopod Holophryxus alaskensis Richardson, and a note on its synonymy. Journal of the Fisheries Research Board of Canada 21: 971 - 976." type="journal article" year="1964">Butler (1964)</bibRefCitation>
observed slight asymmetry in female body shape in some individuals.
</paragraph>
</subSubSection>
<subSubSection id="C32665631D72FFDCFC86BCE331A3F9C4" lastPageId="40" lastPageNumber="632" pageId="39" pageNumber="631" type="discussion">
<paragraph id="8B8336E81D72FFDCFC86BCE3314EFD7E" blockId="39.[809,1426,1478,1899]" lastBlockId="40.[163,780,197,1660]" lastPageId="40" lastPageNumber="632" pageId="39" pageNumber="631">
<emphasis id="B948EAFA1D72FFD3FC86BCE333AAFA63" box="[809,927,1478,1499]" italics="true" pageId="39" pageNumber="631">Remarks:</emphasis>
There is a gross similarity in female maxillipedal morphology between
<bibRefCitation id="EFAD4B191D72FFD3FB42BCC03342F9A1" author="Richardson H" pageId="39" pageNumber="631" pagination="211 - 221" refId="ref42455" refString="Richardson H. 1905 a. Isopods from the Alaska Salmon Investigation. Bulletin of the Bureau of Fisheries 24: 211 - 221." type="journal article" year="1905">Richardson’s (1905a</bibRefCitation>
: fig. 9) illustration and
<bibRefCitation id="EFAD4B191D72FFD3FB3FBF263508F9A1" author="Rustad D" box="[1168,1341,1539,1561]" pageId="39" pageNumber="631" pagination="1 - 31" refId="ref42618" refString="Rustad D. 1935. Notes on Holophryxus richardi Koehler (?) (Fam. Dajidae). Bergens Museums Arbok 1934: 1 - 31." type="journal article" year="1935">Rustad’s (1935</bibRefCitation>
: figs 9, 10) detailed account of the appendage in
<taxonomicName id="4C3C4D6B1D72FFD3FAAFBF0635BEF98F" authorityName="Koehler" authorityYear="1911" box="[1280,1419,1570,1592]" class="Malacostraca" family="Dajidae" genus="Holophryxus" kingdom="Animalia" order="Isopoda" pageId="39" pageNumber="631" phylum="Arthropoda" rank="species" species="richardi">
<emphasis id="B948EAFA1D72FFD3FAAFBF0635BEF98F" box="[1280,1419,1570,1592]" italics="true" pageId="39" pageNumber="631">Ho. richardi</emphasis>
</taxonomicName>
, except that in the former the posteriorly directed appendix arising from the underlying sternal plate appears to be broken off. As pointed out by
<bibRefCitation id="EFAD4B191D72FFD3FAE2BF5B3470F90A" author="Coyle KO &amp; Mueller GJ" pageId="39" pageNumber="631" pagination="1438 - 1443" refId="ref38579" refString="Coyle KO, Mueller GJ. 1981. Larval and juvenile stages of the isopod Holophryxus alaskensis (Epicarida, Dajidae) parasitic on decapods. Canadian Journal of Fisheries and Aquatic Sciences 38: 1438 - 1443." type="journal article" year="1981">Coyle &amp; Mueller (1981: 1440)</bibRefCitation>
,
<bibRefCitation id="EFAD4B191D72FFD3FBFBBFB8351EF90A" author="Butler TH" box="[1108,1323,1693,1715]" pageId="39" pageNumber="631" pagination="971 - 976" refId="ref38108" refString="Butler TH. 1964. Redescription of the parasitic isopod Holophryxus alaskensis Richardson, and a note on its synonymy. Journal of the Fisheries Research Board of Canada 21: 971 - 976." type="journal article" year="1964">Butler (1964: 973</bibRefCitation>
, fig. 3B) misinterpreted part of the antenna as the maxilliped, an observational error also made previously by Nierstrasz &amp; Brender à Brandis (1931: fig. 109). There appears to be some confusion regarding the outline of the first incubatory plate.
<bibRefCitation id="EFAD4B191D72FFD3FBFDBE133514F8F3" author="Butler TH" box="[1106,1313,1846,1868]" pageId="39" pageNumber="631" pagination="971 - 976" refId="ref38108" refString="Butler TH. 1964. Redescription of the parasitic isopod Holophryxus alaskensis Richardson, and a note on its synonymy. Journal of the Fisheries Research Board of Canada 21: 971 - 976." type="journal article" year="1964">Butler (1964: 973)</bibRefCitation>
describes the oostegite as seemingly ‘… divided into 4 lobes, 2 lobes visible …’ and like Nierstrasz &amp; Brender à Brandis (1931: fig. 109) illustrates it with a transverse suture line. The incubatory plate is here reinterpreted as slightly bilobate (as in
<taxonomicName id="4C3C4D6B1D7DFFDCFE4DB80732A7FE8E" authorityName="Huys &amp; Savchenko &amp; Kosobokova" authorityYear="2023" box="[482,658,289,311]" class="Malacostraca" family="Dajidae" genus="Holophryxus" kingdom="Animalia" order="Isopoda" pageId="40" pageNumber="632" phylum="Arthropoda" rank="species" species="citriformis">
<emphasis id="B948EAFA1D7DFFDCFE4DB80732A7FE8E" box="[482,658,289,311]" italics="true" pageId="40" pageNumber="632">Ho. citriformis</emphasis>
</taxonomicName>
) with the transverse ‘suture’ representing the posterior border of the underlying second oostegite (IP2) (compare with
<figureCitation id="13072A6D1D7DFFDCFF0CB85830CDFE2A" box="[163,248,381,403]" captionStart="Figure 4" captionStartId="18.[163,242,1563,1585]" captionTargetBox="[367,1238,198,1531]" captionTargetId="figure-118@18.[364,1241,195,1534]" captionTargetPageId="18" captionText="Figure 4. Holophryxus citriformis sp. nov. Holotype, adult female: A, anterior part of body, showing cephalic and thoracic regions with associated limbs, ventral view; left pereopods and incubatory plate 1 omitted to show position of incubatory plates 2–4 (A1 = antennule, A2 = antenna, CP 1–4 = coxal plates 1–4, CR = cephalic ridge, IP1–5 = incubatory plates 1–5, Md = mandible, P5 = pereopod 5, SP = sternal plate); B, posterior part of body, showing spinous margins of incubatory plates (IP5) and position of anal opening (indicated by arrow)." figureDoi="http://doi.org/10.5281/zenodo.8011019" httpUri="https://zenodo.org/record/8011019/files/figure.png" pageId="40" pageNumber="632">Fig. 4A</figureCitation>
). It is conceivable that
<bibRefCitation id="EFAD4B191D7DFFDCFDBAB8583331FE2B" author="Richardson H" box="[533,772,381,403]" pageId="40" pageNumber="632" pagination="211 - 221" refId="ref42455" refString="Richardson H. 1905 a. Isopods from the Alaska Salmon Investigation. Bulletin of the Bureau of Fisheries 24: 211 - 221." type="journal article" year="1905">Richardson’s (1905a</bibRefCitation>
: fig. 10) illustration of the ‘terminal segment of first lamella of incubatory plate’ is based on a similar misinterpretation [but see
<bibRefCitation id="EFAD4B191D7DFFDCFE40B8FC32F2FE57" author="Rustad D" box="[495,711,473,495]" pageId="40" pageNumber="632" pagination="1 - 31" refId="ref42618" refString="Rustad D. 1935. Notes on Holophryxus richardi Koehler (?) (Fam. Dajidae). Bergens Museums Arbok 1934: 1 - 31." type="journal article" year="1935">Rustad (1935: 25)</bibRefCitation>
for a dissenting opinion]. The male antenna is elongate and, depending on the authority, extends to the posterior margin of the first (
<bibRefCitation id="EFAD4B191D7DFFDCFE26BB10322DFDF3" author="Butler TH" box="[393,536,565,587]" pageId="40" pageNumber="632" pagination="971 - 976" refId="ref38108" refString="Butler TH. 1964. Redescription of the parasitic isopod Holophryxus alaskensis Richardson, and a note on its synonymy. Journal of the Fisheries Research Board of Canada 21: 971 - 976." type="journal article" year="1964">Butler, 1964</bibRefCitation>
) or second pereonite (
<bibRefCitation id="EFAD4B191D7DFFDCFF04BB713147FDD1" author="Richardson H" box="[171,370,596,618]" pageId="40" pageNumber="632" pagination="689 - 696" refId="ref42508" refString="Richardson H. 1908. On some isopods of the family Dajidae from the northwest Pacific Ocean, with descriptions of a new genus and two new species. Proceedings of the United States National Museum 33: 689 - 696." type="journal article" year="1908">Richardson, 1908</bibRefCitation>
). Although the segmentation of the antenna requires confirmation,
<bibRefCitation id="EFAD4B191D7DFFDCFD8FBB57333EFD30" author="Richardson H" box="[544,779,626,648]" pageId="40" pageNumber="632" pagination="689 - 696" refId="ref42508" refString="Richardson H. 1908. On some isopods of the family Dajidae from the northwest Pacific Ocean, with descriptions of a new genus and two new species. Proceedings of the United States National Museum 33: 689 - 696." type="journal article" year="1908">Richardson’s (1908)</bibRefCitation>
claim that it consists of seven segments is almost certainly incorrect.
</paragraph>
<paragraph id="8B8336E81D7DFFDCFF14BBEB3339FA3F" blockId="40.[163,780,197,1660]" pageId="40" pageNumber="632">
Females of
<taxonomicName id="4C3C4D6B1D7DFFDCFEECBBEA31DEFD5B" authorityName="Richardson" authorityYear="1905" box="[323,491,718,740]" class="Malacostraca" family="Dajidae" genus="Holophryxus" kingdom="Animalia" order="Isopoda" pageId="40" pageNumber="632" phylum="Arthropoda" rank="species" species="alaskensis">
<emphasis id="B948EAFA1D7DFFDCFEECBBEA31DEFD5B" box="[323,491,718,740]" italics="true" pageId="40" pageNumber="632">Ho. alaskensis</emphasis>
</taxonomicName>
display a cephalon that lacks a hood-like extension and has a slightly arched ventral cephalic ridge, part of which is discernible in dorsal aspect. This cephalic
<typeStatus id="5487884A1D7DFFDCFE48BA0E322CFCF8" box="[487,537,811,832]" pageId="40" pageNumber="632">type</typeStatus>
3 (
<figureCitation id="13072A6D1D7DFFDCFD91BA0F32BFFCF8" box="[574,650,810,832]" captionStart="Figure 15" captionStartId="31.[146,224,1114,1136]" captionTargetBox="[177,1392,197,1085]" captionTargetId="graphics-432@31.[234,1029,526,771]" captionTargetPageId="31" captionText="Figure 15. Schematic showing general morphology of cephalon in Ho.citriformis (A-C) (Type 1), Ho.quadratahumerale (D-F) (Type 2) and Ho. acanthephyrae (G-I) (Type 3) in ventral (A, D, G), dorsal (B, E, H) and lateral (C, F, I) aspect. CP1–2 = coxal plates 1–2, DP = dorsal prominence, HE = hood-like extension, L = length of ventral cephalic ridge, VCR = ventral cephalic ridge (shaded), W = width of ventral cephalic ridge." figureDoi="http://doi.org/10.5281/zenodo.8011051" httpUri="https://zenodo.org/record/8011051/files/figure.png" pageId="40" pageNumber="632">Fig. 15</figureCitation>
G-I) is also exhibited by
<taxonomicName id="4C3C4D6B1D7DFFDCFE90BA6F3229FCE6" authorityName="Stephensen" authorityYear="1912" box="[319,540,841,863]" class="Malacostraca" family="Dajidae" genus="Holophryxus" kingdom="Animalia" order="Isopoda" pageId="40" pageNumber="632" phylum="Arthropoda" rank="species" species="acanthephyrae">
<emphasis id="B948EAFA1D7DFFDCFE90BA6F3229FCE6" box="[319,540,841,863]" italics="true" pageId="40" pageNumber="632">Ho. acanthephyrae</emphasis>
</taxonomicName>
,
<taxonomicName id="4C3C4D6B1D7DFFDCFD83BA6F32E1FCE6" box="[556,724,841,863]" class="Malacostraca" family="Dajidae" genus="Holophryxus" kingdom="Animalia" order="Isopoda" pageId="40" pageNumber="632" phylum="Arthropoda" rank="species" species="fusiformis">
<emphasis id="B948EAFA1D7DFFDCFD83BA6F32E1FCE6" box="[556,724,841,863]" italics="true" pageId="40" pageNumber="632">Ho. fusiformis</emphasis>
</taxonomicName>
,
<taxonomicName id="4C3C4D6B1D7DFFDCFD4BBA6F3117FCC5" baseAuthorityName="Schultz" baseAuthorityYear="1978" class="Malacostraca" family="Dajidae" genus="Holophryxus" kingdom="Animalia" order="Isopoda" pageId="40" pageNumber="632" phylum="Arthropoda" rank="species" species="polyandrus">
<emphasis id="B948EAFA1D7DFFDCFD4BBA6F3117FCC5" italics="true" pageId="40" pageNumber="632">Ho. polyandrus</emphasis>
</taxonomicName>
and
<taxonomicName id="4C3C4D6B1D7DFFDCFEF7BA4D31EAFCC5" authorityName="Koehler" authorityYear="1911" box="[344,479,872,893]" class="Malacostraca" family="Dajidae" genus="Holophryxus" kingdom="Animalia" order="Isopoda" pageId="40" pageNumber="632" phylum="Arthropoda" rank="species" species="richardi">
<emphasis id="B948EAFA1D7DFFDCFEF7BA4D31EAFCC5" box="[344,479,872,893]" italics="true" pageId="40" pageNumber="632">Ho. richardi</emphasis>
</taxonomicName>
. In
<taxonomicName id="4C3C4D6B1D7DFFDCFDA5BA4D32EFFCC5" authorityName="Stephensen" authorityYear="1912" box="[522,730,872,893]" class="Malacostraca" family="Dajidae" genus="Holophryxus" kingdom="Animalia" order="Isopoda" pageId="40" pageNumber="632" phylum="Arthropoda" rank="species" species="acanthephyrae">
<emphasis id="B948EAFA1D7DFFDCFDA5BA4D32EFFCC5" box="[522,730,872,893]" italics="true" pageId="40" pageNumber="632">Ho. acanthephyrae</emphasis>
</taxonomicName>
and
<taxonomicName id="4C3C4D6B1D7DFFDCFF0CBAA2317EFC23" authorityName="Richardson" authorityYear="1905" box="[163,331,902,924]" class="Malacostraca" family="Dajidae" genus="Holophryxus" kingdom="Animalia" order="Isopoda" pageId="40" pageNumber="632" phylum="Arthropoda" rank="species" species="alaskensis">
<emphasis id="B948EAFA1D7DFFDCFF0CBAA2317EFC23" box="[163,331,902,924]" italics="true" pageId="40" pageNumber="632">Ho. alaskensis</emphasis>
</taxonomicName>
the coxal plates of pereopods 1–5 are expressed as rounded processes on the lateroventral margins of the pereon whereas in the other three species the processes are pointed. Females of the former species can be distinguished from
<taxonomicName id="4C3C4D6B1D7DFFDCFD8BBD2732F1FBAE" authorityName="Richardson" authorityYear="1905" box="[548,708,1025,1047]" class="Malacostraca" family="Dajidae" genus="Holophryxus" kingdom="Animalia" order="Isopoda" pageId="40" pageNumber="632" phylum="Arthropoda" rank="species" species="alaskensis">
<emphasis id="B948EAFA1D7DFFDCFD8BBD2732F1FBAE" box="[548,708,1025,1047]" italics="true" pageId="40" pageNumber="632">Ho. alaskensis</emphasis>
</taxonomicName>
by (1) presence of paired slit-like pit organs on the ventral cephalic ridge (vs. absent); (2) posterior part of pereon without ventrolateral papillae (vs. with); (3) pleon subtriangular, tapering abruptly in posterior half to rounded extremity (vs. broadly concial); and (4) dorsal surface of pleon deeply excavated either side of midline near border with pereon (vs. no surface sculpturing). Males of
<taxonomicName id="4C3C4D6B1D7DFFDCFEA6BDD231EFFAB3" authorityName="Stephensen" authorityYear="1912" box="[265,474,1270,1292]" class="Malacostraca" family="Dajidae" genus="Holophryxus" kingdom="Animalia" order="Isopoda" pageId="40" pageNumber="632" phylum="Arthropoda" rank="species" species="acanthephyrae">
<emphasis id="B948EAFA1D7DFFDCFEA6BDD231EFFAB3" box="[265,474,1270,1292]" italics="true" pageId="40" pageNumber="632">Ho. acanthephyrae</emphasis>
</taxonomicName>
are usually more compact, and unlike
<taxonomicName id="4C3C4D6B1D7DFFDCFE85BC3331E4FA92" authorityName="Richardson" authorityYear="1905" box="[298,465,1301,1323]" class="Malacostraca" family="Dajidae" genus="Holophryxus" kingdom="Animalia" order="Isopoda" pageId="40" pageNumber="632" phylum="Arthropoda" rank="species" species="alaskensis">
<emphasis id="B948EAFA1D7DFFDCFE85BC3331E4FA92" box="[298,465,1301,1323]" italics="true" pageId="40" pageNumber="632">Ho. alaskensis</emphasis>
</taxonomicName>
, possess a non-articulated flagellum on the outer lobe of the antennule (vs. no indication of a flagellum) and exhibit antennae that do not extend to the posterior margin of the first pereonite.
</paragraph>
<paragraph id="8B8336E81D7DFFDCFF14BCB531A3F9C4" blockId="40.[163,780,197,1660]" pageId="40" pageNumber="632">
<bibRefCitation id="EFAD4B191D7DFFDCFF14BCB531A4FA1D" author="Geiger SR" box="[187,401,1424,1446]" pageId="40" pageNumber="632" pagination="103 - 111" refId="ref39248" refString="Geiger SR. 1969. Distribution and development of mysids (Crustacea, Mysidacea) from the Arctic Ocean and confluent seas. Bulletin of the Southern California Academy of Sciences 68: 103 - 111." type="journal article" year="1969">Geiger (1969: 108)</bibRefCitation>
reported a juvenile between the eighth pair of pereopods of
<taxonomicName id="4C3C4D6B1D7DFFDCFE4ABC8A317AFA5B" authority="Holmquist, 1959" authorityName="Holmquist" authorityYear="1959" class="Malacostraca" family="Mysidae" genus="Mysis" kingdom="Animalia" order="Mysida" pageId="40" pageNumber="632" phylum="Arthropoda" rank="species" species="polaris">
<emphasis id="B948EAFA1D7DFFDCFE4ABC8A32B4FA7B" box="[485,641,1454,1476]" italics="true" pageId="40" pageNumber="632">Mysis polaris</emphasis>
<bibRefCitation id="EFAD4B191D7DFFDCFD26BC8B30EFFA5B" author="Holmquist C" pageId="40" pageNumber="632" pagination="21 - 25" refId="ref40105" refString="Holmquist C. 1959. Mysis polaris - a new species of the genus Mysis. Kungliga Fysiografiska Sallskapet i Lund Forhandlingar 29 (2): 21 - 25." type="journal article" year="1959">Holmquist, 1959</bibRefCitation>
(Mysidae)
</taxonomicName>
from the central Arctic Ocean (
<geoCoordinate id="EE08502F1D7DFFDCFD03BCE83333FA5A" box="[684,774,1485,1506]" degrees="84" direction="north" minutes="24" orientation="latitude" pageId="40" pageNumber="632" precision="925" value="84.4">84°24’N</geoCoordinate>
,
<geoCoordinate id="EE08502F1D7DFFDCFF0CBCC9313DF9BA" box="[163,264,1516,1538]" degrees="169" direction="east" minutes="02" orientation="longitude" pageId="40" pageNumber="632" precision="925" value="169.03334">169°02’E</geoCoordinate>
) which he identified as
<taxonomicName id="4C3C4D6B1D7DFFDCFDB9BCC93282F9B9" authorityName="Richardson" authorityYear="1905" box="[534,695,1516,1537]" class="Malacostraca" family="Dajidae" genus="Holophryxus" kingdom="Animalia" order="Isopoda" pageId="40" pageNumber="632" phylum="Arthropoda" rank="species" species="alaskensis">
<emphasis id="B948EAFA1D7DFFDCFDB9BCC93282F9B9" box="[534,695,1516,1537]" italics="true" pageId="40" pageNumber="632">Ho. alaskensis</emphasis>
</taxonomicName>
.
<bibRefCitation id="EFAD4B191D7DFFDCFD6BBCC9314AF998" author="Boyko CB &amp; Williams JD" pageId="40" pageNumber="632" pagination="111 - 121" refId="ref37756" refString="Boyko CB, Williams JD. 2021 b. New records of species of Holophryxus Richardson, 1905 (Crustacea: Isopoda: Dajidae) from the Atlantic and Pacific Oceans with comments on taxonomic issues in the genus. Bulletin of the Peabody Museum of Natural History 62: 111 - 121." type="journal article" year="2021">Boyko &amp; Williams (2021b)</bibRefCitation>
dismissed this record, stating that no species of
<taxonomicName id="4C3C4D6B1D7DFFDCFE96BF0C31FFF986" baseAuthorityName="Butler" baseAuthorityYear="1964" box="[313,458,1577,1598]" class="Malacostraca" family="Dajidae" genus="Holophryxus" kingdom="Animalia" order="Isopoda" pageId="40" pageNumber="632" phylum="Arthropoda" rank="genus">
<emphasis id="B948EAFA1D7DFFDCFE96BF0C31FFF986" box="[313,458,1577,1598]" italics="true" pageId="40" pageNumber="632">Holophryxus</emphasis>
</taxonomicName>
are known from the marsupium of mysid hosts and that it probably belongs to a different dajid genus.
</paragraph>
</subSubSection>
</treatment>
</document>
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