The land crab Johngarthia lagostoma is endemic to the Atlantic oceanic islands of Ascencion, Trindade and Martin Vaz, Fernando de Noronha and the Rocas Atoll. A previous study found significant genetic structure in J. lagostoma between the oceanic islands of Trindade and Fernando de Noronha/Rocas Atoll. Likewise, the first stage zoea, herein described and illustrated based on material from the remote oceanic of Trindade, is reported differ morphologically in minor details from J. lagostoma zoea I previously described from Fernando de Noronha and Rocas Atoll. Johngarthia lagostoma and J. planata from the eastern tropical Pacific are shown to differ in the setation of the antenna and coxae of the maxillule and maxilla. No characters from the first zoeal stage and from the adult morphology can be set forth as diagnostic for Johngarthia. The uncommon large eye of the first zoea of J. lagostoma is here suggested as an autapomorphy to J. lagostoma but future research may reveal that this character is actually more widely distributed within the genus Johngarthia.

陆蟹Johngarthia lagostoma是大西洋岛屿阿森森岛、特林达德岛和马丁瓦兹岛、费尔南多迪诺罗尼亚岛和罗卡斯环礁的特有种。之前的一项研究在特林达德和费尔南多·迪诺罗尼亚/罗卡斯环礁之间的海洋岛屿之间的J. lagostoma 中发现了重要的遗传结构。同样，第一阶段的 zoea，这里描述和说明的基于来自遥远的 Trindade 海洋的材料，据报道在形态上与我之前从 Fernando de Noronha 和 Rocas Atoll 描述的J. lagostoma zoea 有细微的差别。Johngarthia lagostom a 和J. planata来自东热带太平洋的海龟在上颌骨和上颌骨的触角和髋部的位置上有所不同。来自第一动物区系和成虫形态的任何特征都不能作为Johngarthia 的诊断特征。J. lagostoma的第一个zoea不常见的大眼睛在这里被认为是J. lagostoma的自体异种，但未来的研究可能会揭示这个特征实际上更广泛地分布在Johngarthia属中。