Diexanthema hakuhomaruae sp. nov. (Copepoda: Siphonostomatoida: Nicothoidae) from the Hadal Zone in the Northwestern Pacific, with an 18S Molecular Phylogeny.
Crustacea
Ectoparasite
Integrative taxonomy
Japan
Parasites
Journal
Acta parasitologica
ISSN: 1896-1851
Titre abrégé: Acta Parasitol
Pays: Switzerland
ID NLM: 9301947
Informations de publication
Date de publication:
Jun 2023
Jun 2023
Historique:
received:
13
12
2022
accepted:
14
03
2023
medline:
22
6
2023
pubmed:
5
4
2023
entrez:
4
4
2023
Statut:
ppublish
Résumé
Diexanthema copepods are ectoparasites on deep-sea isopods. This genus currently contains six species, all reported from the North Atlantic. Our study describes a new species of Diexanthema found on isopods from 7184 to 7186 m depth in the Kuril-Kamchatka Trench, northwestern Pacific. We observed the copepod's morphology, made camera-lucida drawings, and compared our species with congeners. We determined partial sequences for its 16S rRNA and 18S rRNA genes and constructed an 18S-based maximum-likelihood copepod tree to place it phylogenetically. We identified the host isopod species through morphology and cytochrome c oxidase subunit I (COI, cox1) and 18S sequences. We described the copepod as Diexanthema hakuhomaruae sp. nov. and identified its host as Eugerdella cf. kurabyssalis Golovan, 2015 (Desmosomatidae). This is the first Diexanthema copepod from the Pacific and also from hadal depths. Diexanthema hakuhomaruae most closely resembles D. bathydiaita Richie, 1975, parasitic on Nannoniscus sp. (Nannoniscidae) in the Atlantic, but differs from the latter in having a smooth body surface and leg 5 in the ventrolateral region of the urosome. In the 18S tree, D. hakuhomaruae was the sister group to the Rhizorhina clade, which is consistent with the morphology-based hypothesis that they are closely related.
Identifiants
pubmed: 37014541
doi: 10.1007/s11686-023-00676-z
pii: 10.1007/s11686-023-00676-z
doi:
Substances chimiques
RNA, Ribosomal, 16S
0
RNA, Ribosomal, 18S
0
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
413-419Subventions
Organisme : Japan Society for the Promotion of Science
ID : JP19K06800
Organisme : Japan Society for the Promotion of Science
ID : JP22H02681
Informations de copyright
© 2023. The Author(s) under exclusive licence to Witold Stefański Institute of Parasitology, Polish Academy of Sciences.
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