Copepoda endoparasitic of tropical holothurians

A number of Copepoda of the family Lichomolgidae, all endoparasitic in tropical holothurians, has been described. All belong to the group of genera related to Paranthessius, as borne out by the structure of their appendages, although the body-shape often has undergone modifications due to the endoparasitic mode of life. A key to the genera of the Paranthessius group is provided. Descriptions and illustrations are given of Scambicornus carinatus n.sp. (host Stichopus monotuberculatus from the Ethiopian Red Sea coast), Lichothuria mandibularis n.gen., n.sp. (host Halodeima atra from the Gulf of Aqaba), Diogenella spinicauda n. gen., n. sp. (host Holothuria mexicana from Curaçao), D. seticauda n.sp. (hosts Halodeima surinamensis and Holothuria impatiens from the Antilles), Diogenidium nasutum Edwards, 1891 (host Holothuria mexicana from the Antilles), D. spinulosum n.sp. (host Isostichopus badinotus from Puerto Rico), and D. deforme (host Holothuria glaberrina from Puerto Rico).