The first zoeal stages of the snapping shrimps Alpheus carlae and A. intrinsecus from Brazil were obtained from laboratory-hatched specimens and a detailed morphological description is provided. The morphological characteristics of both species are compared with available descriptions of other Alpheus species with a known first zoeal stage. Remarks from a semi-quantitative comparison of species belonging to A. armillatus species complex (A. carlae and A. brasileiro) and a comparison between larvae of A. intrinsecus from two localities in Brazil are presented. It was possible to distinguish first zoea of both species from the other congeners based on morphology. No intraspecific variability was detected between A. intrinsecus larvae obtained from two locations. Some structures showed differences between species of the A. armillatus complex. However, generalizations and conclusions based on larval morphology for taxonomic rearrangements at this point need to be made with caution and accuracy, since data of a sufficient number of species are not yet available for comparison.

中文翻译：

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实验室获得的鲢鱼和土鳖（十足目、鲱科、鲱科）的初生动物阶段形态

鳄虾的第一个生化阶段鲢鱼和A.内在来自巴西的样品是从实验室孵化的标本中获得的，并提供了详细的形态描述。将两个物种的形态特征与其他物种的可用描述进行比较阿尔菲斯具有已知的第一动物阶段的物种。来自属于的物种的半定量比较的备注A. armillatus物种复合体（A. carlae和A. brasileiro) 和幼虫之间的比较A.内在来自巴西的两个地方。有可能根据形态将这两个物种的第一只zoea与其他同族区分开来。之间未检测到种内变异性A.内在从两个位置获得的幼虫。一些结构显示出物种之间的差异A. armillatus复杂的。然而，此时基于幼虫形态学分类重排的概括和结论需要谨慎和准确地做出，因为尚无足够数量的物种的数据可用于比较。