Abstract—

The ostracods are an ideal object for studies of microevolutionary process, in particular, the evolution of sexual dimorphism, since they have a long and continuous fossil record, clearly expressed morphological traits, the presence of sexual dimorphism, and numerous and clearly distinguished age stages. The paper reviews previous reports on the evolution of sexual dimorphism in ostracods and reports new data on this phenomenon. For some ostracods, males have been shown to be the first to be involved in evolutionary process from the Miocene to the present. The carapace hinge of the males differs from that in females due to pedomorphic reorganizations. This phenomenon has been identified for the first time in the Mesozoic (Late Callovian) species Lophocythere acrolophos (Mikhailovtsement section, Ryazan oblast), the juvenile features of which continue to retain in the hinge of male carapaces.

中文翻译：

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介形目（Ostracoda，甲壳纲）作为研究性二形性进化的模型对象

摘要-

介形动物是研究微进化过程，特别是两性异形演化的理想对象，因为它们具有长期连续的化石记录，清晰表达的形态特征，两性异形的存在，以及众多且清晰可辨的年龄阶段。该论文回顾了之前关于介形虫性别二态性进化的报告，并报告了关于这一现象的新数据。对于一些介形动物，从中新世到现在，雄性已被证明是第一个参与进化过程的。由于足形重组，雄性的背甲铰链与雌性的不同。这种现象首次在中生代（晚卡洛夫纪）物种Lophocythere acrolophos 中被发现 （梁赞州 Mikhailovtsement 部分），其幼年特征继续保留在雄性甲壳的铰链中。