The complete larval development of the spider crab Maguimithrax spinosissimus (Lamarck, 1818) is re-described and illustrated in detail from laboratory-reared material. The development consisted of the typical pattern reported for the Majoidea, two zoeal stages and one megalopa. The complete larval development from hatching to first crab lasted 5–6 days at temperatures that ranged between 24–28 °C. Both zoeal stages of M. spinosissimus exhibited moderate reduction in the number of setae in the maxilla and maxillipeds, from the first to the second zoeal stage, when compared with other closely related species. Maguimithrax spinosissimus can be easily distinguished from other species belonging to the closely related genus Mithrax by the (i) setation of the endopod of the maxillule, maxilla and second maxilliped in both zoeal stages; (ii) setation of the scaphognathite of the maxilla in the first zoeal stage; (iii) setation of the basis of maxilliped I in the second zoeal stage and megalopa; (iv) morphology of the antennule and antenna in the second zoeal stage; and (v) setation of the antennule, coxal endite of maxilla, and exopod of second maxilliped in the megalopa. All these characters support the recent generic status of Maguimithrax within the Mithracidae. Additional morphological details, not available previously, are provided. This study will provide support for conservation strategies in this species.

中文翻译：

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加勒比帝王蟹 Maguimithrax spinosissimus (Lamarck, 1818) 的幼虫发育，西大西洋最大的短吻蟹 (Crustacea: Decapoda: Majoidea)

蜘蛛蟹的完整幼体发育刺螳螂(Lamarck, 1818) 从实验室饲养的材料中重新描述和详细说明。发展包括报告的 Majoidea 的典型模式，两个 zoeal 阶段和一个巨型动物。在 24-28 °C 的温度范围内，从孵化到第一只螃蟹的完整幼体发育持续了 5-6 天。两个zoeal阶段M. spinosissimus与其他密切相关的物种相比，从第一到第二生肖阶段，上颌骨和上颌足的刚毛数量适度减少。刺螳螂可以很容易地与属于密切相关属的其他物种区分开来密特拉克斯通过 (i) 在两个动物阶段的上颌骨、上颌骨和第二颌骨的内足动物的位置；(ii) 第一生肖阶段上颌骨的scaphognathite 的凝固；(iii) 上颌足 I 在第二个动物阶段和巨型动物的基础的设置；(iv) 第二生肖阶段触角和触角的形态；(v) 大角亚目中的触角、上颌骨的尾端和第二颌足的外足纲的设置。所有这些字符都支持最近的通用状态马吉米特拉克斯属于密特拉科。提供了以前没有的其他形态学细节。这项研究将为该物种的保护策略提供支持。