Morphological diversification with emphasis on the structural and homology patterns of male genitalia in genus Limnebius (Leach 1815; Hydraenidae: Coleoptera)

IF 3 2区 生物学 Q1 ZOOLOGY
Andrey Rudoy, Ling-Zeng Meng
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引用次数: 0

Abstract

Limnebius exhibits uniform external appearance but variable male genitalia: from differently curved rod shapes in the subgenus Bilimneus to up to seven longitudinally separated folds or appendages in Limnebius s.s.. Among nonsexual traits, two subgenera diverge only in the wing. The aedeagal complexity in Limnebius s.s. is associated with the secondary sexual structures on the abdomen and metatibia; larger body size, which forms two clusters; and male-biased sexual dimorphism. To cluster the subdivisions with phylogenetically unresolved relationships, we examined the coincidence of the traits in both sexes, based on the premise of the independent and monophyletic origin of histologically unsimilar elements. The folds and additional appendages on the median lobe, abdominal paired rows of setae, and protuberances show that the L. parvulus and L. nitidus groups have maximum aedeagal complexity in the L. parvulus and L. nitiduloides subgroups, respectively. The L. parvulus group exhibits a gradual increase in the number of elements of the aedeagi. The histology of connections of the parameres and additional appendages to the median lobe, along with that of the flagellum opening, reveal the subgroups’ relationship in the L. nitidus group, as well as a decrease in the complexity of the male genitalia in their recent branches.
Limnebius (Leach 1815; Hydraenidae: Coleoptera) 属雄性生殖器结构和同源模式的形态多样化
Limnebius的外貌一致,但雄性生殖器多变:从Bilimneus亚属的不同弯曲杆状到Limnebius s.s.的多达七个纵向分开的皱褶或附属物。在无性性状方面,两个亚属仅在翅上存在差异。Limnebius s.s.的副翅复杂性与腹部和蹠上的第二性结构、较大的体型(形成两个群)以及雄性偏向的性二态有关。为了对系统发育关系未明的分支进行聚类,我们以组织学上不相似的元素的独立和单系起源为前提,研究了两性特征的重合性。中叶上的褶皱和额外附属物、腹部成对的刚毛列以及突起表明,L. parvulus 和 L. nitidus 亚群的雌雄瓣膜复杂性分别达到最高。L.parvulus亚群的茎瓣元素数量逐渐增加。副生殖器和中叶附加附肢的连接组织学以及鞭毛开口的组织学显示了 L. nitidus 亚群中的亚群关系,以及其最近分支中雄性生殖器复杂性的降低。
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来源期刊
CiteScore
6.50
自引率
10.70%
发文量
116
审稿时长
6-12 weeks
期刊介绍: The Zoological Journal of the Linnean Society publishes papers on systematic and evolutionary zoology and comparative, functional and other studies where relevant to these areas. Studies of extinct as well as living animals are included. Reviews are also published; these may be invited by the Editorial Board, but uninvited reviews may also be considered. The Zoological Journal also has a wide circulation amongst zoologists and although narrowly specialized papers are not excluded, potential authors should bear that readership in mind.
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