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首页> 外文期刊>Zoological Science >Copepod parasites of the fatheads (Pisces, Psychrolutidae) and their implication on the phylogenetic relationships of psychrolutid genera.
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Copepod parasites of the fatheads (Pisces, Psychrolutidae) and their implication on the phylogenetic relationships of psychrolutid genera.

机译：fat头的Pi足类寄生虫（双鱼座，Psychrolutidae）及其对Psychrolutid属的系统发育关系的暗示。

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摘要

Nine species of psychrolutids kept in the Marine Zoology of Hokkaido University were found to carry eight species of copepod parasites. The parasites and their hosts are: Bobkabata kabatabobbus Hogans and Benz, 1990 on Malacocottus zonurus Bean; Chondracanthus parvus n. sp. on Eurymen gyrinus Gilbert and Burke; Chondracanthus yabei n. sp. on Dasycottus setiger Bean and M. zonurus; Ch. yanezi Atria, 1980 on Psychrolutes phrictus Stein and Bond; Caligus similis n. sp. on Neophrynichthys latus (Hutton); Clavella adunca (Strm, 1762) on M. zonurus; Neobrachiella amphipacifica Ho, 1982 on Ambophthalmos angustus (Nelson), Cottunculus sp., D. setiger, Ebinania brephocephala (Jordan and Starks), E. vermiculata Sakamoto, and P. phrictus; and Naobranchia occidentalis Wilson, 1915 on D. setiger and M. zonurus. Chondracanthus parvus is closest to Ch. deltoideus Fraser, 1920, but differs from it in having only one pair of small knobs on the head and carrying a pair of lateral processes on the second pediger. Chondracanthus yabei resembles Ch. yanezi Atria, 1980, but can be distinguished from it by the presence of three, low protrusions on the mid-dorsal surface of the trunk; besides, maxillule also shows difference. As the name indicates, C. similis resembles several species of Caligus that bear a short abdomen and a formula of I; IV on the exopod of leg 4. However, it can be separated from them by the combination of the following characters: a genital complex distinctly smaller than the cephalothoracic shield, a pair of relatively short caudal rami, a smooth dentiform process on maxillule, and a pair of truncate tines on sternal furca. Analysis of the occurrence of Chondracanthus on the psychrolutid fishes shows that the phylogeny of Chondracanthus is in congruence with that of the Psychrolutidae. It implies that parasitism of Chondracanthus occurred after the Dasycottus clade diverged off the main stock of the Psychrolutidae and the occurrence of Ch. yabei on D. setiger is resulted from a later colonization.
机译：北海道大学海洋动物学中保存的九种精神纲动物被发现携带八种of足类寄生虫。寄生虫及其寄主是：1990年在Malacocottus zonurus Bean上的Bobkabata kabatabobbus Hogans和Benz;短软骨猪笼草sp。在Eurymen gyrinus Gilbert和Burke身上;亚种猪笼草sp。在Dasycottus移行者Bean和M. zonurus上;频道yanezi Atria，1980年，《 Psychrolutes phrictus Stein and Bond》;蒲sp。在新月蛾（Hutton）上; zonurus上的Cuncella adunca（Strum，1762）; 1982年在Ambophthalmos angustus（Nelson），Cottunculus sp。，D。setiger，Ebinania brephocephala（Jordan和Starks），ver线虫E. vermiculata Sakamoto和P. phrictus上的新臂孢属（Neobrachiella amphipacifica Ho）;以及Naobranchia occidentalis Wilson，1915年创作于D. setiger和M. zonurus。软骨鱼最接近Ch。 deltoideus Fraser，1920，但与之不同的是，头部只有一对小旋钮，而第二个花梗则带有一对侧向过程。软骨鱼亚贝类似于Ch。 yanezi Atria，1980，但可以通过在树干的中背表面上出现三个低矮的突起而与之区分开。此外，上颌也有差异。顾名思义，C。similis类似于几种具有短腹部和式I的Caligus。 IV在第4条腿的外足上。但是，可以通过以下特征的组合将其与它们分开：生殖器复合体明显小于头颈胸膜，一对相对较短的尾部拉美，上颌的平滑牙状突和胸骨上的一对截齿。分析了在七彩科鱼类上的软骨鱼的发生，表明了七彩科动物的系统发育与七彩科的一致。这意味着在Dasycottus进化枝脱离了Psychrolutidae的主要种群和Ch。的发生之后，就发生了软骨病的寄生。 D. setiger上的yabei是后来的定殖造成的。

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