1Department of Oceanography, Federal University of Pernambuco (UFPE), Av. Arquitetura, Cidade Universitária, 50740-550 Recife, PE, Brazil 2 Department of Biology, Federal Rural University of Pernambuco (UFRPE), Av. Manuel de Medeiros, Dois Irmãos, 52171-900, Recife, PE, Brazil.
1Department of Oceanography, Federal University of Pernambuco (UFPE), Av. Arquitetura, Cidade Universitária, 50740-550 Recife, PE, Brazil.
Zootaxa. 2021 Jun 18;4990(1):192-200. doi: 10.11646/zootaxa.4990.1.13.
The objective of this paper is to describe and illustrate the first zoeal stage of the largest land crab of the Tropical Atlantic, Johngarthia lagostoma (Milne Edwards, 1837) (Brachyura: Gecarcinidae). A larval description of J. lagostoma was previously not available. Larvae were obtained from ovigerous females on Rocas Atoll and Fernando de Noronha Archipelago, Brazil. Twenty larvae were randomly chosen to be dissected and described in detail, while 40 others (20 larvae from each island) were measured only. The published description of the congener J. planatus (Stimpson, 1860) larvae was used for a comparison of larval morphology. Some morphological differences between the first zoeal stage of these two species were: The absence or presence of a simple shorter seta on antennule, number of the minute terminal spines on the antenna, setation of the coxal endite of the maxilla, exopod unsegmented of the first and second maxilliped, and a single mid-dorsal seta on first pleonite. These results and differences observed between these species can assist in studies on phylogenetic relationships within the Family Gecarcinidae MacLeay, 1838, as well as in the identification of the larvae of J. Lagostoma in plankton samples from the tropical Atlantic.
本文旨在描述和说明热带大西洋最大陆地蟹 Johngarthia lagostoma（Milne Edwards，1837）（短尾下目：扇蟹科）的第一期幼体。先前没有关于 J. lagostoma 幼虫的描述。幼虫是从巴西罗卡斯环礁和费尔南多-迪诺罗尼亚群岛的抱卵雌蟹中获得的。随机选择了 20 只幼虫进行详细解剖和描述，而另外 40 只（每个岛屿 20 只幼虫）仅进行了测量。使用已发表的同种 J. planatus（Stimpson，1860）幼虫的描述进行了幼虫形态的比较。这两个物种的第一期幼体之间存在一些形态差异：触角上是否存在简单较短的刚毛、触角上微小末端刺的数量、大颚胸足的coxal 端片的刚毛排列、第一和第二大颚足的外肢无分段以及第一胸节上的单个中背刚毛。这些结果和这些物种之间观察到的差异可以协助研究扇蟹科 MacLeay，1838 内的系统发育关系，以及在热带大西洋浮游生物样本中鉴定 J. Lagostoma 的幼虫。
