Platysympus Stebbing, 1912

Gerken, Sarah, 2018, The Lampropidae (Crustacea: Cumacea) of the World, Zootaxa 4428 (1), pp. 1-192 : 134-135

Platysympus Stebbing, 1912

Platysympus Stebbing, 1912: 143–144 .

Platyaspis .— Sars, 1870: 158.

Type species. Platyaspis typicus Sars, 1870 , by monotypy and original designation.

Diagnosis. Carapace dorsoventrally flattened, marginal carina present, eyelobe present, pseudorostral lobes short, blunt. Antennule flagella well developed, accessory flagellum at least 0.5 length of main flagellum. Mandible navicular. Maxillule palp absent. Pereopod 1 slender. Pereopod 5 longer than pereopod 4 basis. Telson less than 2/3 length of uropod peduncles. Uropod endopod of 3 articles. Uropod exopod article 1 0.2 length of article 2, or less. Female with rudimentary or absent exopod on pereopod 2, rudimentary or absent exopods on pereopods 3–4, without pleopods. Male with short antenna, not extending past pereon, without penial lobes, with 3 pairs of pleopods.

Species. Platysympus brachyurus ( Zimmer, 1907) , P. camelus Day, 1978 , P. compressus Day, 1978 , P. depressus Day, 1978 , P.japonicus Gamô, 1975 , P. muranoi Gamô, 1980 , P. ovalis Gamô, 1987 , P. pacificus Corbera, 2006 , P. phylloides Day, 1978 , P. quadrangulatus Gamô, 1987 , P. tricarinatus Hansen, 1920 , P. typicus ( Sars, 1870) .

Remarks. The most similar genera to Platysympus are Aplatysympus and Paraplatysympus , which are differentiated by the state of the maxillule palp and pereopod 5. In Aplatysympus pereopod 5 is longer than the pereopod 4 basis, as in Platysympus , but the maxillule palp is present and bears 2 setae. In Paraplatysympus the maxillule palp is present and bears 2 setae, and pereopod 5 is shorter than the basis of pereopod 4.