{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,19]],"date-time":"2026-09-19T18:56:12Z","timestamp":1789844172553,"version":"4.0.1"},"reference-count":30,"publisher":"Springer Science and Business Media LLC","issue":"1","license":[{"start":{"date-parts":[[2024,3,1]],"date-time":"2024-03-01T00:00:00Z","timestamp":1709251200000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"},{"start":{"date-parts":[[2024,3,11]],"date-time":"2024-03-11T00:00:00Z","timestamp":1710115200000},"content-version":"vor","delay-in-days":10,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"funder":[{"DOI":"10.13039\/501100003790","name":"Hiroshima University","doi-asserted-by":"crossref","id":[{"id":"10.13039\/501100003790","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":["link.springer.com"],"crossmark-restriction":false},"short-container-title":["Acta Parasit."],"published-print":{"date-parts":[[2024,3]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec>\n                <jats:title>Purpose<\/jats:title>\n                <jats:p>The present paper describes two new genera and species of the parasitic copepod family Chondracanthidae Milne Edwards, 1840 based on specimens collected from two species of deep-sea fishes at a depth of 212\u00a0m off Suruga Bay, Japan. <jats:italic>Avatar nishidai<\/jats:italic><jats:bold>gen.<\/jats:bold> et <jats:bold>sp. nov.<\/jats:bold> is described from the host fish <jats:italic>Chaunax abei<\/jats:italic> Le Danois, 1978 (Chaunacidae). <jats:italic>Kokeshioides surugaensis<\/jats:italic><jats:bold>gen.<\/jats:bold> et <jats:bold>sp. nov.<\/jats:bold> is described from the host fish <jats:italic>Setarches longimanus<\/jats:italic> (Alcock, 1894) (Setarchidae).<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Methods<\/jats:title>\n                <jats:p>Fresh specimens of chondracanthids were collected from the buccal cavity of two species of deep-sea fishes (fish hosts were frozen), <jats:italic>Chaunax abei<\/jats:italic> Le Danois, 1978 (Lophiiformes: Chaunacidae) and <jats:italic>Setarches longimanus<\/jats:italic> (Alcock, 1894) (Perciformes: Setarchidae), caught at a depth of 212\u00a0m in Suruga Bay, Japan (34\u00b0 37\u203248.87\u2033 N, 138\u00b0 43\u20322.958\u2033 E). Both the species are described and illustrated based on ovigerous females.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>The genus <jats:italic>Avatar<\/jats:italic><jats:bold>gen. nov.<\/jats:bold> can readily be distinguished from all other chondracanthid genera by the following combination of features: cephalothorax slightly wider than long with anterior pair of large and posterior pair of small lateral lobes, and two pairs of ventro-lateral processes; the very posteriormost part of the first pedigerous somite contributes to the neck; cylindrical trunk with two pairs of blunt proximal fusiform processes; antennule with small knob terminally; antenna bearing distal endopodal segment; labrum protruding ventrally; two pairs of biramous legs each with 2-segmented rami. <jats:italic>Kokeshioides<\/jats:italic><jats:bold>gen. nov.<\/jats:bold> has the following combinations of features that distinguish it from other chondracanthid genera: body flattened, without lateral processes; cephalothorax much wider than long, with paired anterolateral and posterolateral lobes, folded ventrally; the very posteriormost part of the first pedigerous somite contributes to the neck; mandible elongate; legs unique, heavily sclerotized, represented by two pairs of acutely pointed processes.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusion<\/jats:title>\n                <jats:p>With the addition of two new genera presently reported, the family Chondracanthidae currently includes 52 valid genera. Among the described genera <jats:italic>Avatar<\/jats:italic><jats:bold>gen. nov.<\/jats:bold> seems to be very primitive, while <jats:italic>Kokeshioides<\/jats:italic><jats:bold>gen. nov.<\/jats:bold> is highly advanced. The deduced evolutionary history of chondracanthid genera is also discussed.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1007\/s11686-024-00820-3","type":"journal-article","created":{"date-parts":[[2024,3,11]],"date-time":"2024-03-11T17:01:57Z","timestamp":1710176517000},"page":"874-888","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Two New Genera and Species of the Parasitic Copepod Family Chondracanthidae Milne Edwards, 1840 (Copepoda: Cyclopoida) from Deep-Sea Fishes Off Suruga Bay, Japan"],"prefix":"10.1007","volume":"69","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8506-5107","authenticated-orcid":false,"given":"Panakkool Thamban","family":"Aneesh","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1435-8153","authenticated-orcid":false,"given":"Susumu","family":"Ohtsuka","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0659-2169","authenticated-orcid":false,"given":"Yusuke","family":"Kondo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6018-7442","authenticated-orcid":false,"given":"Ameri Kottarathil","family":"Helna","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,3,11]]},"reference":[{"key":"820_CR1","doi-asserted-by":"publisher","first-page":"215","DOI":"10.1016\/S0924-7963(97)00058-4","volume":"15","author":"GA Boxshall","year":"1998","unstructured":"Boxshall GA (1998) Host specificity in copepod parasites of deep-sea fishes. 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No potential conflict of interest was reported by the authors.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Coflict of Interests"}},{"value":"All the authors consent to the publication of this manuscript.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for Publication"}},{"value":"The specimen is not under the listed category of experimental animals, which needs ethics approval.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical Approval"}}]}}