The ontogeny of two species of the family Notodromadidae (Cypridoidea, Ostracoda, Crustacea); taxonomic and palaeogeographic significance
The ontogeny of two species of the family Notodromadidae (Cypridoidea, Ostracoda, Crustacea); taxonomic and palaeogeographic significance
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Notodromadidae 科（Cypridoidea、Ostracoda、Crustacea）两个物种的个体发育；
DOI：
10.11646/zootaxa.5094.3.1
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发表时间：
2022
期刊：
影响因子：
0.9
通讯作者：
Takahiro Kamiya
中科院分区：
文献类型：
--
作者：
Robin J. Smith;Patrick De Deckker;Takahiro Kamiya
文中提供了Notodroma trulla Smith Kamiya(Notodroma trulla Smith Kamiya，2014)和Newnhamia fenestrata King，1855(Notodromadinae亚科)两种Notodromadidae胚胎后发育的详细信息，并与以往对其他足足科和超科的个体发育研究进行了比较。个体发育一般与其他科相似，由8个自由生活的幼虫阶段和1个成虫阶段组成，但一龄幼虫具有腿状的下巴，与其他科相似。从A-7龄起，甲壳腹缘呈扁平卵圆形，背外侧眼杯分离，与成虫眼杯相似，表明幼虫很早就开始接受与成虫相似的中性生活方式。除了腹缘，Notodromadinae的其他仿形包括幼虫行走腿上的刺状突起，成年后这些突起变小，以及下颌的特征，可能与中性粒细胞摄食有关。总体而言，Ne。窗口地层具有更多的拟态特征。Trulla，并且两个物种之间的大多数差异与性别选择特征有关，例如触角的不同性别二形性特征。这表明，性选择是导致该亚科形态差异的主要进化驱动力。两个分类群，一个来自日本(No.Trulla)，另一个澳大利亚(Ne.在中侏罗世开始的联合古陆解体以来，可能已经分离了。这表明，尽管地理上长期与世隔绝，介形类解剖的许多方面在很长一段时间内都保持不变。通过对该科分类的回顾，我们得出结论：该科的单系性有待进一步研究证实，而Notodromadinae亚科可分为两个组：Notodroma组和Newnhamia组。
Details of the post-embryonic development of two Notodromadidae species, Notodromas trulla Smith Kamiya, 2014 and Newnhamia fenestrata King, 1855,(subfamily Notodromadinae) are provided, and compared with previous ontogenetic studies on other podocopid families and superfamilies. The ontogenetic development is generally similar to other families, consisting of eight free-living juvenile stages and one adult stage, but the first instar, with a leg-like mandible, resembles that of the Cyprididae, rather than other families. From the A-7 instar onwards, the ventral margin of the carapace is a flattened ovoid, and the dorsolateral eye cups are separated, resembling those of the adults, suggesting that a neustonic lifestyle, similar to that of the adults, is embraced from a very early age. In addition to the ventral margin, other apomorphies of the Notodromadinae include spur-like protrusions on the walking legs of juveniles, which become reduced in adults, and features of the mandibles, probably related to neustonic feeding. Overall, Ne. fenestrata has more plesiomorphic features than No. trulla, and most differences between the two species are related to sexually selected characters, such as different sexually dimorphic features of the antennae. This suggests that sexual selection has been the main evolutionary driving force causing morphological divergence in the subfamily. The two taxa, one from Japan (No. trulla), the other Australia (Ne. fenestrata), have perhaps been separated since the breakup of Pangaea, which started in the Middle Jurassic. This suggests that despite the long geographical isolation, many aspects of ostracod anatomy have remained unchanged over long periods of time. On reviewing the taxonomy of the family, we conclude that monophyly needs to be confirmed with further work, and the subfamily Notodromadinae can be divided into two groups: the Notodromas-group and the Newnhamia-group.