Aplatysympus n. gen.

Diagnosis. Carapace dorsoventrally flattened, marginal carina present, eyelobe present, pseudorostral lobes short, pointed. Antennule flagella short, accessory flagellum as long as main flagellum. Mandible navicular. Maxillule palp with 2 setae. Pereopod 1 slender. Pereopod 5 longer than basis of pereopod 4. Telson moderate, about 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 exopod on pereopod 2, no exopods on pereopods 3–4, without pleopods. Male unknown.

Etymology. A combination of the prefix “ A” meaning “not”, and the generic name Platysympus, in reference to the great similarity of the new genus to Platysympus . Gender masculine.

Type species. Aplatysympus neozealanicus n. sp.

Remarks. Aplatysympus resembles Platysympus in the rudimentary exopod on pereopod 2 and lack of exopods on pereopods 3–4 in the female. However, Platysympus lacks a maxillule palp, present in the new genus. This genus also resembles Doieolamprops in the rudimentary exopod on pereopod 2. However, Doieolamprops has 2 articles in the uropod endopod and a pair of pleopods in the female, while Aplatysympus has 3 articles in the uropod endopod and no pleopods in the female.