目的:本文描述了寄生co足科ChondracanthidaeMilneEdwards的两个新属和物种,1840年,基于从Suruga湾212m深处的两种深海鱼类中收集的标本,日本。阿凡达西代创。等sp.11月。是从寄主鱼ChaunaxabeiLeDanois描述的,1978年(Chaunacidae)。苏木根。等sp.11月。是从寄主鱼Setarcheslongimanus(Alcock,1894年)(Setarchidae)。
方法:从两种深海鱼类(鱼类宿主被冷冻)的颊腔中收集了软骨动物的新鲜标本,ChaunaxabiLeDanois,1978年(Lophiformes:Chaunacidae)和长毛虫(Alcock,1894)(Perciformes:Setarchidae),在Suruga湾的212米深处被捕获,日本(北纬34°37\'48.87英寸,138°43'2.958“E)。这两个物种都是基于产卵的雌性进行描述和说明的。
结果:化身属。11月。通过以下特征的组合,可以很容易地与所有其他软骨类区分开来:头胸稍宽于长前对大和后对小外侧叶,和两对腹侧突;第一个带齿的根茎的最后部有助于颈部;圆柱形躯干,有两对钝的近端梭形突起;末端带有小旋钮的触角;天线承载远端内足段;唇向腹侧突出;两对双齿腿,每对2段的rami。Kokeshioidesgen。11月。具有以下特征组合,将其与其他软骨类属区分开来:身体扁平,没有侧突;头胸比长宽得多,有成对的前外侧和后外侧叶,腹侧折叠;第一个带齿的体节的最后部有助于颈部;下颌骨细长;腿独特,严重硬化,由两对尖锐的过程表示。
结论:加上目前报道的两个新属,Chondracanthidae家族目前包括52个有效属。在所描述的属阿凡达根中。11月。看起来很原始,而Kokeshioides创。11月。是非常先进的。还讨论了软骨类属的演化史。
OBJECTIVE: 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.
CONCLUSIONS: 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.