A new genus and two new species of Choniostomatidae (Copepoda) parasitic on two deep sea isopods
A new genus and two new species of Choniostomatidae (Copepoda) parasitic on two deep sea isopods
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寄生在两种深海等足类动物上的软骨口科（Copepoda）一新属和两个新种
DOI：
10.1111/j.1096-3642.1975.tb01415.x
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发表时间：
1975
影响因子：
2.8
通讯作者：
L. Ritchie
中科院分区：
文献类型：
--
作者：
L. Ritchie
小变形寄生桡足类Nicothoidae科与严重变形Choniostomatidae科的系统地位多年来一直存在争议。新属 Diexanthema gen. 11 月，基于 Diexanthema desistoma sp。十一月和 Diexanthema Bathydiaita sp。十一月在两种深海等足类等足类动物物种中发现的，明显地将烟科（Nicothoidae）（通过雄性 Diexanthema）与 Choniostomatidae 科（通过雌性 Diexanthema）联系起来。基于这个新属的极端性二态性，建议解散烟科，将其成员归入软骨口科。结论是，这两个寄生群体之间的差异可能更多地归因于宿主的适应，而不是反映任何具有进化意义的系统发育趋势。人们认为，深海环境可能是古代桡足类动物的避难所，这可能为寄生桡足类的系统发育提供更多线索和见解。
这项研究表明，Diexanthema desistoma 的生活史和寄生虫/宿主关系相当复杂，并且与其等足类宿主螯合剂 insignis 的生活史非常吻合。
The systematic position of the little-deformed parasitic copepod family Nicothoidae to the much deformed family Choniostomatidae has been disputed for many years. The new genus Diexanthema gen. nov., based on Diexanthema desistoma sp. nov. and Diexanthema bathydiaita sp. nov. discovered on two deep-sea asellote isopod species, clearly links the family Nicothoidae (via male Diexanthema) to the family Choniostomatidae (via female Diexanthema). Based upon the extreme sexual dimorphism of this new genus, it is suggested that the family Nicothoidae be dissolved and its members placed within the family Choniostomatidae. It is concluded that the differences seen between these two parasitic groups is probably due more to host adaptations than reflecting any phylogenetic trend that is evolutionarily significant. It is felt that the deep-sea environment may serve as a refugium for archaic copepod forms which may possibly offer additional clues and insights into the phylogeny of the parasitic copepoda.
This investigation suggests that the life history and parasite/host relationships of Diexanthema desistoma are quite complicated and well geared to the life history of its isopod host, Chelator insignis.