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External Traces of Segmentation of the Labium in the Corixoidea

机译：Corixoidea唇的分割的外部痕迹

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This paper describes the labium in ten representatives of the Corixoidea (Corixidae, Micronectidae and Diaprepocoridae), using scanning electron microscopy. Several new morphological details provide evidence for the external segmentation of the labium of the Corixoidea. The presence of the ventral condyle articulation (cv) is homologous to the condyle of the third segment of the labium in other nepomorphan species, the ventral lobe (vl) is homologous to the second and third segments of the labium, whereas the presence of the latero-ventral plate (lvp) near the apices is homologous to a part of the fourth segment of the labium in the other nepomorphan species. Moreover, the lower apical lobe (apl) and the pair of the sub-oval plates of the apex (ax) are homologous to the apex structures of the labium in other nepomorphans. The slit is a visible boundary between the second and third labial segments on the ventral side only in the Diaprepocoridae. The indication of the homological structural elements of the labium is a new achievement in comparison to earlier descriptions of this organ in several corixoid species. This supports the finding that traces of segmentation have been morphologically preserved in the labium of the Corixoidea, contrary to other previous studies describing the labium as unsegmented. A modified labium of the Corixoidea confirms an assumption about the evolutionary origins of this organ, which posits that it is homologous to the labium of other nepomorphan species
机译：本文使用扫描电子显微镜描述了十个科科动物的腹肌（科科，微科和双足科）。几个新的形态学细节为Corixoidea唇的外部分割提供了证据。腹侧po突关节（cv）的存在与其他内啡肽物种的第三部分的con突同源，腹叶（vl）与第二部分和第三部分的唇突同源，而顶点附近的背腹板（lvp）与其他内啡肽物种的唇第四节的一部分同源。此外，在其他内啡肽中，下部的顶叶（apl）和顶的一对子椭圆形板（ax）与唇的顶结构同源。狭缝是仅在双足前科中在腹侧的第二和第三阴唇节之间的可见边界。与早先的几种皮质类器官的描述相比，唇部同源结构元素的指示是一项新的成就。这支持了以下发现：在Corixoidea的唇中，保留了形态上的分割痕迹，这与以前的其他研究描述为未分割的唇相反。修饰的Corixoidea的唇草证实了对该器官进化起源的假设，该假设认为它与其他nepomorphan物种的唇草同源

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