<documentid="D194B934B7CB0FFB30B21487670C6E55"ID-CLB-Dataset="281216"ID-DOI="10.11646/zootaxa.5380.3.2"ID-GBIF-Dataset="ea6dbb31-0a7a-4680-bdb5-636eb30560f6"ID-ISSN="1175-5326"ID-Zenodo-Dep="10224718"ID-ZooBank="4D2A3F30-2736-4A4F-930D-E748DC3DEDAB"IM.bibliography_approvedBy="carolina"IM.illustrations_approvedBy="carolina"IM.materialsCitations_approvedBy="felipe"IM.metadata_approvedBy="felipe"IM.tables_approvedBy="carolina"IM.taxonomicNames_approvedBy="guilherme"IM.treatments_approvedBy="carolina"checkinTime="1701333853783"checkinUser="plazi"docAuthor="Komai, Tomoyuki & Sakiyama, Hiroki"docDate="2023"docId="039B87EEFFBAC77CFF4A1D44FA2192BF"docLanguage="en"docName="zootaxa.5380.3.2.pdf"docOrigin="Zootaxa 5380 (3)"docSource="https://www.mapress.com/zt/article/download/zootaxa.5380.3.2/52371"docStyle="DocumentStyle:647186512141C8FC8976D5BCC54AEB7D.9:Zootaxa.2013-.journal_article"docStyleId="647186512141C8FC8976D5BCC54AEB7D"docStyleName="Zootaxa.2013-.journal_article"docStyleVersion="9"docTitle="Metacrimenes Komai & Sakiyama 2023, n. gen."docType="treatment"docVersion="9"lastPageNumber="230"masterDocId="FFA2FF96FFB8C77FFFDD181BFFA5977E"masterDocTitle="A new genus and new species of palaemonid shrimp (Decapoda: Caridea), associated with the deep-sea crinoid Metacrinus rotundus (Echinodermata: Isocrinidae), from Suruga Bay, Japan"masterLastPageNumber="246"masterPageNumber="227"pageNumber="229"updateTime="1736166807988"updateUser="guilherme"zenodo-license-document="CLOSED">
<mods:titleid="0653BA655C167960AB7CC0E8A605CD68">A new genus and new species of palaemonid shrimp (Decapoda: Caridea), associated with the deep-sea crinoid Metacrinus rotundus (Echinodermata: Isocrinidae), from Suruga Bay, Japan</mods:title>
<mods:affiliationid="09CDCDF8868013209ABF8AD86DBC2EA4">Natural History Museum and Institute, Chiba, 955 - 2 Aoba-cho, Chuo-ku, Chiba 260 - 8682, Japan.</mods:affiliation>
<mods:affiliationid="311F469FF9CE407ADA90F8597A42029A">Sunshine Aquarium, Sunshine City World Import Mart Building Rooftop, 3 - 1, Higashi-ikebukuro, Toshima-ku, Tokyo 170 - 8630, Japan.</mods:affiliation>
<taxonomicNameid="4C324D7BFFBAC77DFF4A1D44FEE79207"authority="Komai & Sakiyama, 2023"authorityName="Komai & Sakiyama"authorityYear="2023"box="[151,322,1375,1401]"class="Malacostraca"family="Palaemonidae"genus="Metacrimenes"higherTaxonomySource="CoL"kingdom="Animalia"order="Isopoda"pageId="2"pageNumber="229"phylum="Arthropoda"rank="genus"status="gen. nov.">
<paragraphid="8B8D36F8FFBAC77DFF4A1D98FD6A92E3"blockId="2.[151,719,1375,1437]"box="[151,719,1411,1437]"pageId="2"pageNumber="229">[New Japanese name: Torinoashi-yadori-ebi-zoku]</paragraph>
<taxonomicNameid="4C324D7BFFBAC77DFEE41DD0FD9C929B"authority="Komai & Sakiyama, 2023"authorityName="Komai & Sakiyama"authorityYear="2023"box="[313,569,1483,1509]"class="Malacostraca"family="Palaemonidae"genus="Metacrimenes"higherTaxonomySource="CoL"kingdom="Animalia"order="Isopoda"pageId="2"pageNumber="229"phylum="Arthropoda"rank="species"species="fenestra"status="sp. nov.">
Body weakly compressed laterally. Rostrum well developed, reaching beyond distal end of antennular peduncle; lateral carina low but sharply delimited; dorsal margin dentate, posterior-most (epigastric) tooth without basal suture; ventral margin unarmed. Carapace smooth; inferior orbital angle produced into triangular process; antennal spine marginal; supraorbital spine absent; hepatic spine present, not reaching anterolateral carapace margin, without basal suture. Pleon smooth, posterodorsal margin of third somite not particularly produced; first to fifth pleura broadly rounded. Telson with 2 pairs of dorsolateral spiniform setae; posterior margin with 3 pairs of markedly unequal spiniform setae. Cornea well developed, globular. Antennular peduncle basal article with 2 distolateral spines. Antennal scaphocerite well developed; basicerite with ventrolateral distal spine. Epistome unarmed. Fourth thoracic sternite without median projection. Mandible without palp. Maxillula with bilobed palp. Maxilla with simple palp; basial endite deeply bilobed. First maxilliped with slender palp; exopod with well-developed caridean lobe and flagellum; epipod bilobed. Second maxilliped with normal endopod; exopod flagellum-like; podobranch absent. Third maxilliped with ischiomerus fused with basis; exopod greatly reduced to bud-like lobe; arthrobranch absent. First pereopod with fingers unarmed on occlusal margins. Second pereopod equal and similar from right to left, not particularly elongate; articles unarmed; chela cylindrical, occlusal margins of fingers entire, unarmed. Third to fifth pereopods each with biunguiculate dactylus. Uropod with protopodite unarmed posterolaterally; exopod with minute posterolateral spine accompanied mesially by much longer spiniform seta. Gills comprise of pleurobranchs on fourth to eighth thoracomeres (first to fifth pereopods).
<taxonomicNameid="4C324D7BFFBBC77CFC071918FBDC9662"authority="Komai & Sakiyama, 2023"authorityName="Komai & Sakiyama"authorityYear="2023"box="[986,1145,259,284]"class="Malacostraca"family="Palaemonidae"genus="Metacrimenes"higherTaxonomySource="CoL"kingdom="Animalia"order="Isopoda"pageId="3"pageNumber="230"phylum="Arthropoda"rank="genus"status="gen. nov.">
<taxonomicNameid="4C324D7BFFBBC77CFD1A193CFBE0963F"authority="Li & Bruce, 2006"authorityName="Li & Bruce"authorityYear="2006"box="[711,1093,295,321]"class="Malacostraca"family="Palaemonidae"genus="Mesopontonia"higherTaxonomySource="GBIF"kingdom="Animalia"order="Decapoda"pageId="3"pageNumber="230"phylum="Arthropoda"rank="species"species="brevicarpus">
<bibRefCitationid="EFA34B09FFBBC77CFCA4193CFBE0963F"author="Li, X. & Bruce, A. J."box="[889,1093,295,321]"pageId="3"pageNumber="230"pagination="611 - 738"refId="ref9778"refString="Li, X. & Bruce, A. J. (2006) Further Indo-West Pacific palaemonoid shrimps (Crustacea: Decapoda: Palaemonoidea), principally from the New Caledonian region. Journal of Natural History, 40 (11 - 12), 611 - 738. https: // doi. org / 10.1080 / 00222930600763627"type="journal article"year="2006">Li & Bruce, 2006</bibRefCitation>
<bibRefCitationid="EFA34B09FFBBC77CFB1A193CFA32963F"author="Burukovsky, R. N."box="[1223,1431,295,321]"pageId="3"pageNumber="230"pagination="36 - 41"refId="ref8084"refString="Burukovsky, R. N. (1991) New and rare species of shrimps from the south-west part of the Indian Ocean. Zoologicheskiy Zhurnal, 70, 36 - 41. [in Russian]"type="journal article"year="1991">Burukovsky, 1991</bibRefCitation>
<bibRefCitationid="EFA34B09FFBBC77CFEB71950FE5F961B"author="Bruce, A. J."box="[362,506,331,357]"pageId="3"pageNumber="230"pagination="1 - 73"refId="ref7399"refString="Bruce, A. J. (1967) Notes on some Indo-Pacific Pontoniinae III - IX. Descriptions of some new genera and species from the western Indian Ocean and the South China Sea. Zoologische Verhandelingen, 87, 1 - 73."type="journal article"year="1967">Bruce, 1967</bibRefCitation>
<bibRefCitationid="EFA34B09FFBBC77CFD081950FCC0961B"author="Bruce, A. J."box="[725,869,331,357]"pageId="3"pageNumber="230"pagination="299 - 411"refId="ref7727"refString="Bruce, A. J. (1991) Crustacea Decapoda: further deep-sea palaemonid shrimps from New Caledonian waters. In: Crosnier, A. (Ed.), Resultats des Campagnes MUSORSTOM, Volume 9. Memoires du Museum National d'Histoire Naturelle, Serie A, Zoologie, 152. Museum National d'Histoire Naturelle, Paris, pp. 299 - 411."type="book chapter"year="1991">Bruce, 1991</bibRefCitation>
</taxonomicName>
;
<taxonomicNameid="4C324D7BFFBBC77CFCA91950FC59961B"authorityName="Park, De Grave & Park"authorityYear="2020"box="[884,1020,331,357]"class="Malacostraca"family="Palaemonidae"genus="Mesopontonia"higherTaxonomySource="GBIF"kingdom="Animalia"order="Decapoda"pageId="3"pageNumber="230"phylum="Arthropoda"rank="species"species="kimwoni">
<bibRefCitationid="EFA34B09FFBBC77CFB021950FACB961B"author="Bruce, A. J."box="[1247,1390,331,357]"pageId="3"pageNumber="230"pagination="299 - 411"refId="ref7727"refString="Bruce, A. J. (1991) Crustacea Decapoda: further deep-sea palaemonid shrimps from New Caledonian waters. In: Crosnier, A. (Ed.), Resultats des Campagnes MUSORSTOM, Volume 9. Memoires du Museum National d'Histoire Naturelle, Serie A, Zoologie, 152. Museum National d'Histoire Naturelle, Paris, pp. 299 - 411."type="book chapter"year="1991">Bruce, 1991</bibRefCitation>
<bibRefCitationid="EFA34B09FFBBC77CFE0A1974FDDA96F7"author="Holthuis, L. B."box="[471,639,366,393]"pageId="3"pageNumber="230"pagination="1 - 332"refId="ref9118"refString="Holthuis, L. B. (1951) A general revision of the Palaemonidae (Crustacea Decapoda Natantia) of the Americas. I. The subfamilies Euryrhynchinae and Pontoniinae. Occasional Papers of the Allan Hancock Foundation, 11, 1 - 332."type="journal article"year="1951">Holthuis, 1951</bibRefCitation>
<bibRefCitationid="EFA34B09FFBBC77CFB6B1974FAFB96F7"author="Holthuis, L. B."box="[1206,1374,366,393]"pageId="3"pageNumber="230"pagination="1 - 332"refId="ref9118"refString="Holthuis, L. B. (1951) A general revision of the Palaemonidae (Crustacea Decapoda Natantia) of the Americas. I. The subfamilies Euryrhynchinae and Pontoniinae. Occasional Papers of the Allan Hancock Foundation, 11, 1 - 332."type="journal article"year="1951">Holthuis, 1951</bibRefCitation>
</taxonomicName>
from the eastern Pacific), but in these genera the third maxilliped exopod is absent (cf.
<bibRefCitationid="EFA34B09FFBBC77CFBFC1988FB6696D3"author="Holthuis, L. B."box="[1057,1219,402,429]"pageId="3"pageNumber="230"pagination="1 - 332"refId="ref9118"refString="Holthuis, L. B. (1951) A general revision of the Palaemonidae (Crustacea Decapoda Natantia) of the Americas. I. The subfamilies Euryrhynchinae and Pontoniinae. Occasional Papers of the Allan Hancock Foundation, 11, 1 - 332."type="journal article"year="1951">Holthuis 1951</bibRefCitation>
;
<bibRefCitationid="EFA34B09FFBBC77CFB131988FAF696D3"author="Bruce, A. J."box="[1230,1363,403,429]"pageId="3"pageNumber="230"pagination="1 - 73"refId="ref7399"refString="Bruce, A. J. (1967) Notes on some Indo-Pacific Pontoniinae III - IX. Descriptions of some new genera and species from the western Indian Ocean and the South China Sea. Zoologische Verhandelingen, 87, 1 - 73."type="journal article"year="1967">Bruce 1967</bibRefCitation>
,
<bibRefCitationid="EFA34B09FFBBC77CFA801988FA3296D3"author="Bruce, A. J."box="[1373,1431,403,429]"pageId="3"pageNumber="230"pagination="299 - 411"refId="ref7727"refString="Bruce, A. J. (1991) Crustacea Decapoda: further deep-sea palaemonid shrimps from New Caledonian waters. In: Crosnier, A. (Ed.), Resultats des Campagnes MUSORSTOM, Volume 9. Memoires du Museum National d'Histoire Naturelle, Serie A, Zoologie, 152. Museum National d'Histoire Naturelle, Paris, pp. 299 - 411."type="book chapter"year="1991">1991</bibRefCitation>
,
<bibRefCitationid="EFA34B09FFBBC77CFF4A19ACFF7796AF"author="Bruce, A. J."box="[151,210,439,465]"pageId="3"pageNumber="230"pagination="197 - 267"refId="ref7830"refString="Bruce, A. J. (1996) Crustacea Decapoda: Palaemonoid shrimps from the Indo-West Pacific region mainly from New Caledonia. In: Crosnier, A. (Ed.), Resultats des Campagnes MUSORSTOM, Volume 15. Memoires du Museum National d'Histoire Naturelle, Serie A, Zoologie, 168. Museum National d'Histoire Naturelle, Paris, pp. 197 - 267."type="book chapter"year="1996">1996</bibRefCitation>
;
<bibRefCitationid="EFA34B09FFBBC77CFF3C19ACFE0996AF"author="Li, X. & Bruce, A. J."box="[225,428,439,465]"pageId="3"pageNumber="230"pagination="611 - 738"refId="ref9778"refString="Li, X. & Bruce, A. J. (2006) Further Indo-West Pacific palaemonoid shrimps (Crustacea: Decapoda: Palaemonoidea), principally from the New Caledonian region. Journal of Natural History, 40 (11 - 12), 611 - 738. https: // doi. org / 10.1080 / 00222930600763627"type="journal article"year="2006">Li & Bruce 2006</bibRefCitation>
;
<bibRefCitationid="EFA34B09FFBBC77CFE6719ACFDDD96AF"author="Park, J. - H. & De Grave, S. & Park, T."box="[442,632,439,465]"pageId="3"pageNumber="230"pagination="10190"refId="ref10281"refString="Park, J. - H., De Grave, S. & Park, T. (2020) On the genus Mesopontonia Bruce, 1967 (Crustacea: Decapoda: Palaemonidae) in Korea, with the description of a new species. PeerJ, 8: e 10190 http: // doi. org / 10.7717 / peerj. 10190"type="journal article"year="2020">
<taxonomicNameid="4C324D7BFFBBC77CFB7F19ACFAE496AE"authority="Komai & Sakiyama, 2023"authorityName="Komai & Sakiyama"authorityYear="2023"box="[1186,1345,439,464]"class="Malacostraca"family="Palaemonidae"genus="Metacrimenes"higherTaxonomySource="CoL"kingdom="Animalia"order="Isopoda"pageId="3"pageNumber="230"phylum="Arthropoda"rank="genus"status="gen. nov.">
<taxonomicNameid="4C324D7BFFBBC77CFEEE19C0FE77968A"authority="Komai & Sakiyama, 2023"authorityName="Komai & Sakiyama"authorityYear="2023"box="[307,466,475,500]"class="Malacostraca"family="Palaemonidae"genus="Metacrimenes"higherTaxonomySource="CoL"kingdom="Animalia"order="Isopoda"pageId="3"pageNumber="230"phylum="Arthropoda"rank="genus"status="gen. nov.">
differs from the latter two genera in having a well-developed antennal spine on the carapace; the hepatic spine located in its usual position; the posterior-most tooth of the dorsal rostral series not clearly separated from the preceding teeth; and with the second pereopods being equal in length and similar in shape. In
, the antennal spine is absent; the hepatic spine is located at a submarginal position near the anterolateral margin of the carapace; the posteriormost tooth of the dorsal rostral series is distinctly separated from the preceding teeth and located at the epigastric position; and the second pereopods are more or less unequal in size and dissimilar in shape (
<bibRefCitationid="EFA34B09FFBBC77CFD561AA8FC8A95B3"author="Holthuis, L. B."box="[651,815,690,717]"pageId="3"pageNumber="230"pagination="1 - 332"refId="ref9118"refString="Holthuis, L. B. (1951) A general revision of the Palaemonidae (Crustacea Decapoda Natantia) of the Americas. I. The subfamilies Euryrhynchinae and Pontoniinae. Occasional Papers of the Allan Hancock Foundation, 11, 1 - 332."type="journal article"year="1951">Holthuis 1951</bibRefCitation>
;
<bibRefCitationid="EFA34B09FFBBC77CFCE11AA8FC6495B3"author="Bruce, A. J."box="[828,961,691,717]"pageId="3"pageNumber="230"pagination="1 - 73"refId="ref7399"refString="Bruce, A. J. (1967) Notes on some Indo-Pacific Pontoniinae III - IX. Descriptions of some new genera and species from the western Indian Ocean and the South China Sea. Zoologische Verhandelingen, 87, 1 - 73."type="journal article"year="1967">Bruce 1967</bibRefCitation>
,
<bibRefCitationid="EFA34B09FFBBC77CFC111AA8FBA395B3"author="Bruce, A. J."box="[972,1030,691,717]"pageId="3"pageNumber="230"pagination="299 - 411"refId="ref7727"refString="Bruce, A. J. (1991) Crustacea Decapoda: further deep-sea palaemonid shrimps from New Caledonian waters. In: Crosnier, A. (Ed.), Resultats des Campagnes MUSORSTOM, Volume 9. Memoires du Museum National d'Histoire Naturelle, Serie A, Zoologie, 152. Museum National d'Histoire Naturelle, Paris, pp. 299 - 411."type="book chapter"year="1991">1991</bibRefCitation>
,
<bibRefCitationid="EFA34B09FFBBC77CFBCE1AA8FBEB95B3"author="Bruce, A. J."box="[1043,1102,691,717]"pageId="3"pageNumber="230"pagination="197 - 267"refId="ref7830"refString="Bruce, A. J. (1996) Crustacea Decapoda: Palaemonoid shrimps from the Indo-West Pacific region mainly from New Caledonia. In: Crosnier, A. (Ed.), Resultats des Campagnes MUSORSTOM, Volume 15. Memoires du Museum National d'Histoire Naturelle, Serie A, Zoologie, 168. Museum National d'Histoire Naturelle, Paris, pp. 197 - 267."type="book chapter"year="1996">1996</bibRefCitation>
;
<bibRefCitationid="EFA34B09FFBBC77CFB871AA8FABB95B3"author="Li, X. & Bruce, A. J."box="[1114,1310,691,717]"pageId="3"pageNumber="230"pagination="611 - 738"refId="ref9778"refString="Li, X. & Bruce, A. J. (2006) Further Indo-West Pacific palaemonoid shrimps (Crustacea: Decapoda: Palaemonoidea), principally from the New Caledonian region. Journal of Natural History, 40 (11 - 12), 611 - 738. https: // doi. org / 10.1080 / 00222930600763627"type="journal article"year="2006">Li & Bruce 2006</bibRefCitation>
;
<bibRefCitationid="EFA34B09FFBBC77CFAF41AA8FF71958F"author="Park, J. - H. & De Grave, S. & Park, T."pageId="3"pageNumber="230"pagination="10190"refId="ref10281"refString="Park, J. - H., De Grave, S. & Park, T. (2020) On the genus Mesopontonia Bruce, 1967 (Crustacea: Decapoda: Palaemonidae) in Korea, with the description of a new species. PeerJ, 8: e 10190 http: // doi. org / 10.7717 / peerj. 10190"type="journal article"year="2020">
<taxonomicNameid="4C324D7BFFBBC77CFDAC1ACCFCB5958E"authorityName="Komai & Sakiyama"authorityYear="2023"box="[625,784,727,752]"class="Malacostraca"family="Palaemonidae"genus="Metacrimenes"higherTaxonomySource="CoL"kingdom="Animalia"order="Isopoda"pageId="3"pageNumber="230"phylum="Arthropoda"rank="genus">
in the poorly developed exopod on the first maxilliped and the absence of an exopod on the second maxilliped (
<bibRefCitationid="EFA34B09FFBBC77CFC061AE0FB27946B"author="Holthuis, L. B."box="[987,1154,762,789]"pageId="3"pageNumber="230"pagination="1 - 332"refId="ref9118"refString="Holthuis, L. B. (1951) A general revision of the Palaemonidae (Crustacea Decapoda Natantia) of the Americas. I. The subfamilies Euryrhynchinae and Pontoniinae. Occasional Papers of the Allan Hancock Foundation, 11, 1 - 332."type="journal article"year="1951">Holthuis 1951</bibRefCitation>
), both of which are well developed in the other two genera. The absence of ventral teeth on the rostrum distinguishes
<taxonomicNameid="4C324D7BFFBBC77CFB751B04FAE29446"authority="Komai & Sakiyama, 2023"authorityName="Komai & Sakiyama"authorityYear="2023"box="[1192,1351,799,824]"class="Malacostraca"family="Palaemonidae"genus="Metacrimenes"higherTaxonomySource="CoL"kingdom="Animalia"order="Isopoda"pageId="3"pageNumber="230"phylum="Arthropoda"rank="genus"status="gen. nov.">
<bibRefCitationid="EFA34B09FFBBC77CFA851B58FF7794FF"author="Bruce, A. J."pageId="3"pageNumber="230"pagination="1 - 73"refId="ref7399"refString="Bruce, A. J. (1967) Notes on some Indo-Pacific Pontoniinae III - IX. Descriptions of some new genera and species from the western Indian Ocean and the South China Sea. Zoologische Verhandelingen, 87, 1 - 73."type="journal article"year="1967">Bruce 1967</bibRefCitation>
,
<bibRefCitationid="EFA34B09FFBBC77CFF001B7CFEB294FF"author="Bruce, A. J."box="[221,279,871,897]"pageId="3"pageNumber="230"pagination="299 - 411"refId="ref7727"refString="Bruce, A. J. (1991) Crustacea Decapoda: further deep-sea palaemonid shrimps from New Caledonian waters. In: Crosnier, A. (Ed.), Resultats des Campagnes MUSORSTOM, Volume 9. Memoires du Museum National d'Histoire Naturelle, Serie A, Zoologie, 152. Museum National d'Histoire Naturelle, Paris, pp. 299 - 411."type="book chapter"year="1991">1991</bibRefCitation>
,
<bibRefCitationid="EFA34B09FFBBC77CFEFE1B7CFEFB94FF"author="Bruce, A. J."box="[291,350,871,897]"pageId="3"pageNumber="230"pagination="197 - 267"refId="ref7830"refString="Bruce, A. J. (1996) Crustacea Decapoda: Palaemonoid shrimps from the Indo-West Pacific region mainly from New Caledonia. In: Crosnier, A. (Ed.), Resultats des Campagnes MUSORSTOM, Volume 15. Memoires du Museum National d'Histoire Naturelle, Serie A, Zoologie, 168. Museum National d'Histoire Naturelle, Paris, pp. 197 - 267."type="book chapter"year="1996">1996</bibRefCitation>
;
<bibRefCitationid="EFA34B09FFBBC77CFEB71B7CFD8894FF"author="Li, X. & Bruce, A. J."box="[362,557,871,897]"pageId="3"pageNumber="230"pagination="611 - 738"refId="ref9778"refString="Li, X. & Bruce, A. J. (2006) Further Indo-West Pacific palaemonoid shrimps (Crustacea: Decapoda: Palaemonoidea), principally from the New Caledonian region. Journal of Natural History, 40 (11 - 12), 611 - 738. https: // doi. org / 10.1080 / 00222930600763627"type="journal article"year="2006">Li & Bruce 2006</bibRefCitation>
;
<bibRefCitationid="EFA34B09FFBBC77CFDEA1B7CFD4B94FF"author="Park, J. - H. & De Grave, S. & Park, T."box="[567,750,871,897]"pageId="3"pageNumber="230"pagination="10190"refId="ref10281"refString="Park, J. - H., De Grave, S. & Park, T. (2020) On the genus Mesopontonia Bruce, 1967 (Crustacea: Decapoda: Palaemonidae) in Korea, with the description of a new species. PeerJ, 8: e 10190 http: // doi. org / 10.7717 / peerj. 10190"type="journal article"year="2020">
The phylogenetic analysis based on the concatenated dataset derived from the mitochondrial 16S rRNA and COI sequences shows a clade cconsisting of five taxa,
<taxonomicNameid="4C324D7BFFBBC77CFCD31BB4FBB594B7"authority="Komai & Sakiyama, 2023"authorityName="Komai & Sakiyama"authorityYear="2023"box="[782,1040,943,969]"class="Malacostraca"family="Palaemonidae"genus="Metacrimenes"higherTaxonomySource="CoL"kingdom="Animalia"order="Isopoda"pageId="3"pageNumber="230"phylum="Arthropoda"rank="species"species="fenestra"status="sp. nov.">
<taxonomicNameid="4C324D7BFFBBC77CFB401BC8FA399493"authority="Komai & Sakiyama, 2023"authorityName="Komai & Sakiyama"authorityYear="2023"box="[1181,1436,979,1005]"class="Malacostraca"family="Palaemonidae"genus="Metacrimenes"higherTaxonomySource="CoL"kingdom="Animalia"order="Isopoda"pageId="3"pageNumber="230"phylum="Arthropoda"rank="species"species="fenestra"status="sp. nov.">
were recovered in sister position, however, with low bootstrap support (
<figureCitationid="13092A7DFFBBC77CFAB21BECFF02934B"captionStart="FIGURE 8"captionStartId="15.[151,250,1253,1277]"captionTargetBox="[159,1428,208,1221]"captionTargetId="figure-17@15.[151,1436,200,1229]"captionTargetPageId="15"captionText="FIGURE 8. Maximum-likelihood (ML) tree constructed from concatenated data sets of the mitochondrial COI and 16S rRNA genes of Metacrimenes fenestra n. gen., n. sp. and closely allied palaemonid taxa (log likelihood -10197.759547). Numbers at nodes are bootstrap values; only values>80% are shown. The outgroup (Brachycarpus biunguiculatus) is omitted."figureDoi="http://doi.org/10.5281/zenodo.10224740"httpUri="https://zenodo.org/record/10224740/files/figure.png"pageId="3"pageNumber="230">Fig. 8</figureCitation>
<bibRefCitationid="EFA34B09FFBBC77CFE821C00FE4D934B"author="Bruce, A. J."box="[351,488,1050,1077]"pageId="3"pageNumber="230"refId="ref7794"refString="Bruce, A. J. (1995) A synopsis of the Indo-West Pacific genera of the Pontoniinae (Crustacea: Decapoda: Palaemonidae). Koeltz Scientific Books, Konigstein, 172 pp."type="book"year="1995">Bruce, 1995</bibRefCitation>
<bibRefCitationid="EFA34B09FFBBC77CFB731C00FA99934B"author="Bruce, A. J."box="[1198,1340,1051,1077]"pageId="3"pageNumber="230"pagination="299 - 411"refId="ref7727"refString="Bruce, A. J. (1991) Crustacea Decapoda: further deep-sea palaemonid shrimps from New Caledonian waters. In: Crosnier, A. (Ed.), Resultats des Campagnes MUSORSTOM, Volume 9. Memoires du Museum National d'Histoire Naturelle, Serie A, Zoologie, 152. Museum National d'Histoire Naturelle, Paris, pp. 299 - 411."type="book chapter"year="1991">Bruce, 1991</bibRefCitation>
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in the absence of an antennal spine on the carapace; the hepatic spine in a submarginal position; the distinct epigastric position of the posterior-most tooth of the dorsal rostral series; the possession of a well-developed, flagellum-like exopod of the third maxilliped; and with second pereopods being distinctly unequal in length and dissimilar in shape (
<bibRefCitationid="EFA34B09FFBBC77CFE271CB0FD2793BB"author="Bruce, A. J."box="[506,642,1195,1221]"pageId="3"pageNumber="230"pagination="299 - 411"refId="ref7727"refString="Bruce, A. J. (1991) Crustacea Decapoda: further deep-sea palaemonid shrimps from New Caledonian waters. In: Crosnier, A. (Ed.), Resultats des Campagnes MUSORSTOM, Volume 9. Memoires du Museum National d'Histoire Naturelle, Serie A, Zoologie, 152. Museum National d'Histoire Naturelle, Paris, pp. 299 - 411."type="book chapter"year="1991">Bruce 1991</bibRefCitation>
;
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).
<taxonomicNameid="4C324D7BFFBBC77CFC471CB0FAAF93BB"authority="Marin & Chan, 2006"authorityName="Marin & Chan"authorityYear="2006"box="[922,1290,1195,1221]"class="Malacostraca"family="Palaemonidae"genus="Brucecaris"higherTaxonomySource="GBIF"kingdom="Animalia"order="Decapoda"pageId="3"pageNumber="230"phylum="Arthropoda"rank="genus">
<bibRefCitationid="EFA34B09FFBBC77CFBC01CB0FAAF93BB"author="Marin, I. & Chan, T. - Y."box="[1053,1290,1195,1221]"pageId="3"pageNumber="230"pagination="524 - 539"refId="ref10038"refString="Marin, I. & Chan, T. - Y. (2006) Two new genera and a new species of crinoid-associated pontoniine shrimps (Decapoda: Caridea: Palaemonidae). Journal of Crustacean Biology, 26, 524 - 539. https: // doi. org / 10.1651 / S- 2705.1"type="journal article"year="2006">Marin & Chan, 2006</bibRefCitation>
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<taxonomicNameid="4C324D7BFFBBC77CFCBD1CD4FC5A9396"authority="Komai & Sakiyama, 2023"authorityName="Komai & Sakiyama"authorityYear="2023"box="[864,1023,1231,1256]"class="Malacostraca"family="Palaemonidae"genus="Metacrimenes"higherTaxonomySource="CoL"kingdom="Animalia"order="Isopoda"pageId="3"pageNumber="230"phylum="Arthropoda"rank="genus"status="gen. nov.">
<taxonomicNameid="4C324D7BFFBBC77CFDA71D0CFCD2924F"authority="Komai & Sakiyama, 2023"authorityName="Komai & Sakiyama"authorityYear="2023"box="[634,887,1303,1329]"class="Malacostraca"family="Palaemonidae"genus="Metacrimenes"higherTaxonomySource="CoL"kingdom="Animalia"order="Isopoda"pageId="3"pageNumber="230"phylum="Arthropoda"rank="species"species="fenestra"status="sp. nov.">
<bibRefCitationid="EFA34B09FFBBC77CFF421D20FE3F922B"author="Marin, I. & Chan, T. - Y."box="[159,410,1339,1365]"pageId="3"pageNumber="230"pagination="524 - 539"refId="ref10038"refString="Marin, I. & Chan, T. - Y. (2006) Two new genera and a new species of crinoid-associated pontoniine shrimps (Decapoda: Caridea: Palaemonidae). Journal of Crustacean Biology, 26, 524 - 539. https: // doi. org / 10.1651 / S- 2705.1"type="journal article"year="2006">Marin & Chan 2006</bibRefCitation>
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<bibRefCitationid="EFA34B09FFBBC77CFE141D44FDDB9207"author="Park, J. - H. & De Grave, S. & Park, T."box="[457,638,1375,1401]"pageId="3"pageNumber="230"pagination="10190"refId="ref10281"refString="Park, J. - H., De Grave, S. & Park, T. (2020) On the genus Mesopontonia Bruce, 1967 (Crustacea: Decapoda: Palaemonidae) in Korea, with the description of a new species. PeerJ, 8: e 10190 http: // doi. org / 10.7717 / peerj. 10190"type="journal article"year="2020">
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</taxonomicName>
, to which the new taxon is superficially similar. Gender: masculine.
