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首页> 外文期刊>Journal of Molluscan Studies >Embryonic, larval and postlarval development of the tropical clam, Anomalocardia brasiliana (Bivalvia, Veneridae)
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Embryonic, larval and postlarval development of the tropical clam, Anomalocardia brasiliana (Bivalvia, Veneridae)

机译：胚胎，幼虫和后塔的热带蛤蜊，异常蛤蜊（Bivalvia，Veneridae）

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摘要

Anomalocardia brasiliana (Gmelin. 1791) is a venerid clam, distributed from the West Indies to Brazil, which lives shallowly burrowed in muddy sands of mangrove lagoons in Guadeloupe. Development from induced spawning to metamorphosed juveniles is described by using light and scanning electron microscopy. The shell-field appears at the gastrula stage, 6 h after fertilization, and rapid embryonic development results in straight-hinge veligers, 18 h after fertilization. These swimming veligers develop to swimming-crawling pediveligers, then to benthic plantigrades with functional elongated gill filaments without interruption in 15 days. The transitional arched structures observed at the end of the pediveliger stage were called 'ctenidial crypts' to distinguish them from functional gill filaments which exist only in metamorphosed juveniles. Metamorphosis, which occurs without a special environmental cue, is completed with the differentiation of the siphons in 300 #mu#m juveniles. Thus. there is no delay of metamorphosis in this species whereas a developmental hiatus has been described in most planktotrophic bivalves. Juveniles, 1 mm in shell-length with the triangular shape, pointed posterior end and brown zig-zag stripes on the shell, typical of A. brasiliana have been obtained 7 weeks after fertilization. However, a large variability of individual sizes and developmental stages within the same batches may indicate a high genetic variability.
机译：Anomalocardia Brasiliana（Gmelin。1791）是一个Venerid蛤蜊，分布在西印度群岛到巴西，这在瓜德罗普岛的美洲红树泻湖泥泞的沙滩上浅埋。通过使用光和扫描电子显微镜描述从诱导的产卵到变质幼绒的发展。壳场出现在胃肠杆菌阶段，施肥后6小时，胚胎发育快速，施肥后18小时，促进旋转套管。这些游泳魔术师发展到游泳爬行的PediveLigers，然后在15天内没有中断功能细长鳃长丝的底栖大道。在Pediveliger阶段的末端观察到的过渡拱形结构被称为“链毒密地”，将它们与仅存在变质幼年中存在的功能鳃丝。在没有特殊环境提示的情况下发生的变态，并在300＃mu＃m少年中差异化了虹吸管的差异。因此。该物种中没有变态延迟，而大多数植物营养性纤维植物纤维植物已经描述了发育中的疾病。少年，1mm的壳长与三角形，尖端的后端和棕色锯齿状条纹在壳体上，施肥后7周获得了典型的A.Brasiliana。然而，相同批次内的个体尺寸和发育阶段的大变化可以表明高遗传变异性。

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