Allodiastylis Hale, 1936

Gerken, Sarah, 2015, New Zealand Diastylidae and Gynodiastylidae (Crustacea: Cumacea), Zootaxa 4031 (1), pp. 1-77 : 69

Allodiastylis Hale, 1936

Type species. Allodiastylis cretatus Hale, 1936 .

Diagnosis. Female and subadult male. Pseudorostrum long, slender, distinctly dorsally directed. Eyelobe short, broad, without lenses. Antennule long, more than 0.5 times carapace length, peduncle articles 1–2 expanded, more than twice width of article 3, article 3 longer than articles 1–2 together. Pereopod 1 simple. Female entirely without exopods. Uropod endopod biarticulate. Telson at least 1.5 times pleonite 6 length, tubular, with no post-anal section, with pair of terminal setae.

Adult male. Pseudorostrum robust, distinctly ventrally directed. Eyelobe long, very broad, with multiple lenses. Antenna with 3–4 article peduncle and 11 article flagellum. Exopods present maxilliped 3–pereopod 4. Telson terminal setae long.

Remarks. Only one species is known from New Zealand waters, Allodiastylis acanthanasillos from the Chatham Rise. This genus is notable within the Cumacea for the extreme degree of sexual dimorphism, particularly unusual within the Gynodiastylidae .