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首页> 外文期刊>Zoological Science >Male Dimorphism in the Harem-forming Gnathiid Isopod Elaphognathia discolor (Crustacea: Isopoda)
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Male Dimorphism in the Harem-forming Gnathiid Isopod Elaphognathia discolor (Crustacea: Isopoda)

机译：形成闺房的Gnathiid Isopod Elaphognathia变色（甲壳纲：Isopoda）中的男性二态性

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摘要

Previously unreported males of a gnathiid isopod were found in reproductive aggregations of the harem-forming gnathiid Elaphognathia discolor. Although the male gnathiids were small in size and morphologically different from E. discolor males, the male sexual organ, appendix masculina, was similar to that of E. discolor males, and possible conspecific larvae and females of the small male gnathiid were never found. In the laboratory, the small male gnathiids as well as male E. discolor successfully copulated with female E. discolor, and the development of embryos in female brood pouches was observed. Offspring of small male gnathiids develop to adults of E. discolor after molting three times, or small male gnathiids after molting two times. Thus, the small male gnathiid was concluded to be an alternative male form compared to the regular large male form of E. discolor. This male polymorphism was thought to have a genetic basis, since no small male specimens appeared in offspring of regular E. discolor males. Field sampling showed that a regular large male formed a harem composed of one large male and several females and never coexisted with other large males as previously reported. However, small males were often found together with large males. Therefore, small males are thought to be sneakers intruding into harems dominated by large males.
机译：在形成后宫的长节虫Elaphognathia变色的生殖聚集体中发现了以前未报告的长节虫等足动物。尽管雄性虫的体型较小，并且在形态上与变色的雄性，虫不同，但是雄性性器官，阑尾假阳具与变色的雄性similar虫相似，并且从未发现过可能的同种幼虫和雌性。在实验室中，小型雄性棘齿类动物和雄性大肠杆菌变色成功地与雌性大肠杆菌变色交配，并且观察到雌性育雏袋中的胚胎发育。小型雄性咬指甲的后代在蜕皮三倍后会发育成成虫，或小型雄性咬指甲在蜕皮两次后成色。因此，与普通大雄性大肠杆菌变色相比，小型雄性咬足虫被认为是另一种雄性形式。这种雄性多态性被认为具有遗传基础，因为在常规的变色雄性大肠杆菌的后代中没有出现小的雄性标本。野外采样显示，一个普通的大公形成了由一个大公和几只母组成的后宫，并且从未与其他大公共存。但是，经常发现小雄性和大雄性。因此，小矮人被认为是侵入大矮人主导的后宫的运动鞋。

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