Family Xanthidae comprises 15 subfamilies and over 600 accepted species; they are represented well in the foreshore marine environments. Members of family Xanthidae are multi-colored crabs, usually inhabiting rocky coasts, coral reefs, and mud flats, all of which are well represented along the Egyptian coast of the Red Sea. Here, we utilized cytochrome oxidase subunit I (COI) sequences combined with morphology to provide information on some xanthid specimens collected from the Egyptian coast of the Red Sea. Six species within four genera (Leptodius, Etisus, Cyclodius, Chlorodiella) were collected. Genetic distances combined with morphological analyses showed intraspecific variations between two morphotypes of Leptodius exaratus. Two Etisus species were examined, E. laevimanus and E. sp. The latter Etisus sp. was close to E. frontalis, especially with regard to frontal lobe morphology, but different in male's first gonopod, with interspecific genetic distances. We also identified Chlorodiella nigra and C. laevissima. Obtained genetic distances between two morphotypes of Cyclodius granulatus revealed that these morphotypes are also likely cases of intraspecific variation. The results of this study should provide a basis for future work on family Xanthidae along the coasts of the Red Sea, which is needed as data remain scant.

Family Xanthidae 包括 15 个亚科和 600 多个可接受的物种；它们在前滨海洋环境中表现良好。Xanthidae 科的成员是多色螃蟹，通常栖息在岩石海岸、珊瑚礁和泥滩，所有这些都在红海的埃及海岸沿线有很好的代表。在这里，我们利用细胞色素氧化酶亚基 I ( COI ) 序列结合形态学来提供有关从红海埃及海岸收集的一些黄原体标本的信息。四属六种（Leptodius，Etisus，Cyclodius，Chlorodiella) 被收集。遗传距离与形态学分析相结合显示了Leptodius exaratus两种形态型之间的种内变异。检查了两个Etisus物种，E. laevimanus和E. sp。后者Etisus sp。接近E。frontalis，特别是在额叶形态方面，但在雄性的第一个生殖足类中不同，具有种间遗传距离。我们还鉴定了Chlorodiella nigra和C。laevissima。获得了Cyclodius granulatus两种形态型之间的遗传距离揭示这些形态类型也可能是种内变异的情况。这项研究的结果应该为红海沿岸黄原科的未来工作提供基础，这是由于数据仍然不足所必需的。