• Animal Systematics, Evolution and Diversity
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• v.40 no.4
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• pp.302-307
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• 2024

Carcinothoe haustra n. gen. n. sp. feeding on eggs of the three-spotted swimming crab Portunus sanguinolentus is described from Korean waters. Choniosphaera indica Gnanamuthu, 1954, which was previously described as copepod parasitic on the same species of the crab from India, is transferred to Carcinothoe n. gen. As two significant synapomorphic features in the female of the new genus, the antennule is 5-segmented and the caudal ramus is transformed into an elongate stylet. As other diagnostic features in the female of the new genus, the body is elliptical, unsegmented, and slightly compressed laterally, the urosome is completely fused with the prosome, the caudal rami are fused with abdominal region, the genital region is positioned on the ventral surface and partly covered with a pair of genital plates, the antenna is 4-segmented with two denticulate spines distally, the maxillule bears two setae on the precoxal endite and three apical setae on the unsegmented palp, the maxilla is 2-segmented, and the maxilliped is 4-segmented and tipped with a denticulate spine. Carcinothoe haustra n. gen. n. sp. differs from C. indica n. comb. in having an anteroventrally protruded buccal region, the antennule which is remotely separated from the buccal region, and no legs.