ABSTRACT

Larval characteristics play an important role in life history, phylogenetic and systematic studies. The morphology of the first post-embryonic stages (zoeae I–III) of the snapping shrimp Alpheus petronioi were described in detail and illustrated based on laboratory-hatched larvae. The morphological characteristics of the species were compared with available descriptions of other Alpheus species with known first zoeal stages. We provided a combination of characteristics useful for the diagnosis of the early zoeal stages of A. petronioi. The species can be separated from the first zoeal stage of the other species of the genus using the following structures: basial endite of maxillule with 2 stout spines (both without rows of spinules), and 2 small plumose setae; endopod of maxillule with 1 terminal denticulate seta, 1 short terminal simple seta and 1 subterminal spine; basial endite of maxilla bilobed, with 4 and 5 simple setae on proximal and distal lobe, respectively and basis of second maxilliped with 5 (3 strong and 2 slender) simple setae arranged (2 + 2 + 1). This is the first study on the biology of A. petronioi after its description, adding new information on its life history.

摘要

幼虫特征在生活史、系统发育和系统研究中起着重要作用。详细描述了鳄虾Alpheus petronioi的第一个胚胎后阶段（zoeae I-III）的形态，并根据实验室孵化的幼虫进行了说明。将该物种的形态特征与可用的其他具有已知第一个 zoeal 阶段的Alpheus物种的描述进行了比较。我们提供了可用于诊断A. petronioi早期 zoeal 阶段的特征组合. 该物种可以使用以下结构与该属其他物种的第一个 zoeal 阶段区分开来：上颌骨的基部末端有 2 个粗壮的刺（均无小刺行）和 2 个小的羽状刚毛；上颌骨内足有 1 个末端小齿刚毛，1 个短末端单刚毛和 1 个近末端棘；上颌骨基端双叶形，近端叶和远端叶分别有4和5根单刚毛，第二颌骨基部有5根（3根强壮和2根细长）单刚毛排列（2 + 2 + 1）。这是对A. petronioi描述后的首次生物学研究，为其生活史增添了新的信息。