Although the larval development of epigean palaemonid shrimps has been studied extensively, only a few investigations deal with stygobitic species. We present the larval development of the cave-adapted Creaseria morleyi (Creaser, 1936) from anchialine caves in the Tulum area, Quintana Roo, Yucatán Peninsula, Mexico. Through the discovery of a series of larvae at different stages of development, we constructed a sequence extending through the juvenile stage. The larvae (41) were captured in plankton tows above the halocline at depths ranging between 11 and 15 m during eight surveys conducted between 2013 and 2016. Six larval stages and the first juvenile were identified; however, it is clear from the gradual modification of structures and appendages that more stages exist. The first larvae have a large quantity of vitellum and do not feed, since they have only rudimentary, and possibly non-functional, mouthparts. In the sixth stage and the juvenile, when the stages have no vitellum left, the mouthparts, chelae, and pleopods develop entirely. A comparison with other palaemonid shrimps suggests that C. morleyi has a greater affinity with those palaemonid species possessing extended larval development as is seen in species of Macrobrachium Spence Bate, 1868.

中文翻译：

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来自墨西哥尤卡坦半岛的 stygobitic 虾 Creaseria morleyi (Creaser, 1936) (Decapoda: Caridea: Palaemonidae) 的幼虫发育

尽管已经广泛研究了表皮古对虾的幼虫发育，但只有少数研究涉及stygobitic 物种。我们介绍了墨西哥尤卡坦半岛金塔纳罗奥州图卢姆地区的 Anchialine 洞穴中适应洞穴的克雷瑟菌 (Creaser, 1936) 的幼虫发育。通过发现一系列处于不同发育阶段的幼虫，我们构建了一个延伸到幼虫阶段的序列。在 2013 年至 2016 年期间进行的八次调查中，在盐层上方 11 至 15 m 深度的浮游生物拖带中捕获了幼虫 (41)。确定了六个幼虫阶段和第一个幼虫；然而，从结构和附属物的逐渐修改中可以清楚地看出存在更多阶段。第一只幼虫有大量的卵黄并且不进食，因为它们只有简陋的、可能没有功能的口器。在第六期和幼鱼期，当卵黄已不存在时，口器、螯足和腹足完全发育。与其他 palaemonid 虾的比较表明，C. morleyi 与那些具有延长幼虫发育期的 palaemonid 物种具有更大的亲和力，如 Macrobrachium Spence Bate 物种中所见，1868 年。