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两种新的寄生桡足类 Chondracanthidae Milne Edwards，1840 科（桡足类：Cyclopoida）从骏河湾深海鱼类中发现的属和种。

Two New Genera and Species of the Parasitic Copepod Family Chondracanthidae Milne Edwards, 1840 (Copepoda: Cyclopoida) from Deep-Sea Fishes Off Suruga Bay, Japan.

机构信息

Blue Innovation Division, Seto Inland Sea Carbon Neutral Research Center, 5-8-1 Minato-Machi, Takehara, Hiroshima, 725-0024, Japan.

Travancore Nature History Society (TNHS), MBRRA, Mathrubhumi Road, Vanchiyoor, Trivandrum, Kerala, 695035, India.

出版信息

Acta Parasitol. 2024 Mar;69(1):874-888. doi: 10.1007/s11686-024-00820-3. Epub 2024 Mar 11.

DOI:10.1007/s11686-024-00820-3
PMID:38468018
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11001686/
Abstract

PURPOSE

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 m off Suruga Bay, Japan. Avatar nishidai gen. et sp. nov. is described from the host fish Chaunax abei Le Danois, 1978 (Chaunacidae). Kokeshioides surugaensis gen. et sp. nov. is described from the host fish Setarches longimanus (Alcock, 1894) (Setarchidae).

METHODS

Fresh specimens of chondracanthids were collected from the buccal cavity of two species of deep-sea fishes (fish hosts were frozen), Chaunax abei Le Danois, 1978 (Lophiiformes: Chaunacidae) and Setarches longimanus (Alcock, 1894) (Perciformes: Setarchidae), caught at a depth of 212 m in Suruga Bay, Japan (34° 37'48.87″ N, 138° 43'2.958″ E). Both the species are described and illustrated based on ovigerous females.

RESULTS

The genus Avatar gen. nov. 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. Kokeshioides gen. nov. 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.

CONCLUSION

With the addition of two new genera presently reported, the family Chondracanthidae currently includes 52 valid genera. Among the described genera Avatar gen. nov. seems to be very primitive, while Kokeshioides gen. nov. is highly advanced. The deduced evolutionary history of chondracanthid genera is also discussed.

摘要

目的

本研究基于从日本骏海湾深海鱼类（深度 212 米）采集的标本，描述了两种新的寄生桡脚类科 Chondracanthidae Milne Edwards，1840 属和种。Avatar nishidai gen. et sp. nov. 描述自 Chaunax abei Le Danois，1978（Chaunacidae）宿主鱼。Kokeshioides surugaensis gen. et sp. nov. 描述自 Setarches longimanus（Alcock，1894）（Setarchidae）宿主鱼。

方法

从日本骏海湾深海鱼类（宿主鱼被冷冻）的口腔中采集桡脚类标本，深度 212 米，鱼类宿主为 Chaunax abei Le Danois，1978（Lophiiformes：Chaunacidae）和 Setarches longimanus（Alcock，1894）（Perciformes：Setarchidae）。两种物种均根据有卵的雌性进行描述和说明。

结果

Avatar 属 gen. nov. 可以通过以下特征组合与所有其他桡脚类属明显区分开来：头胸甲略宽于长，前对大，后对小侧叶，两对腹侧侧叶；第一胸节的最末部分有助于形成颈部；圆柱形躯干有两对钝的近侧梭形突起；触角具小末端结节；触角具末端内末肢；唇突出于腹侧；两对双肢，每对有 2 节分支。Kokeshioides 属 gen. nov. 具有以下特征组合，使其与其他桡脚类属区别开来：身体扁平，无侧叶；头胸甲宽大于长，具对生的前外侧和后外侧叶，腹侧折叠；第一胸节的最末部分有助于形成颈部；颚须长；腿独特，高度硬化，由两对尖锐的突起代表。

结论

加上目前报道的两个新属，桡脚类科目前包括 52 个有效属。在所描述的属中，Avatar 属 gen. nov. 似乎非常原始，而 Kokeshioides 属 gen. nov. 则非常先进。还讨论了桡脚类属的进化历史。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/21c0/11001686/79011085d990/11686_2024_820_Fig11_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/21c0/11001686/615342d8b9a2/11686_2024_820_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/21c0/11001686/e71c4f60702e/11686_2024_820_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/21c0/11001686/96f2b3e39288/11686_2024_820_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/21c0/11001686/9a384e123dd6/11686_2024_820_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/21c0/11001686/11db29703887/11686_2024_820_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/21c0/11001686/dd5540da57cb/11686_2024_820_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/21c0/11001686/3ed5ca82b87d/11686_2024_820_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/21c0/11001686/cf3431905e78/11686_2024_820_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/21c0/11001686/79011085d990/11686_2024_820_Fig11_HTML.jpg

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A new species of Chondracanthus (Cyclopoida: Chondracanthidae) parasitic on deep-sea Dibranchus spongiosa(Lophiiformes: Ogcocephalidae) from the Eastern Central Pacific.
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The first chondracanthid (Copepoda: Cyclopoida) reported from cultured finfish, with a revised key to the species of Chondracanthus.首次报道的养殖鳍鱼类中的软骨鱼虱（桡足类：剑水蚤目），并对软骨鱼虱属物种的检索表进行修订。
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