Astacilla Cordiner, 1793

Stransky, Bente, Svavarsson, Jörundur, Poore, Gary C. B. & Kihara, Terue Cristina, 2020, Revision of Pleuroprion zur Strassen, 1903 (Holidoteidae) and re-evaluation of Spectrarcturus Schultz, 1981 (Arcturidae) (Crustacea, Isopoda, Valvifera), Zootaxa 4894 (1), pp. 1-52 : 45

Genus Astacilla Cordiner, 1793

Astacilla Cordiner, 1793 .— King, 2003: 359–361.— Kensley, Schotte and Poore, 2007: 436–437.

Diagnosis (from King 2003): Body strongly geniculate between pereonites 4 and 5, cylindrical, with no dorsal ridge. Antenna slender or robust, with 2 or 3 flagellar articles, flagellum distally with claw. Maxillipedal palp with all segments free, palp article 3 similar width as article 2. Pereonite 4 elongate; pereonite 4 of male and female of similar length. Pereopod 1 setose, with unguis (rarely without). Pereopods 2–4 present and functional as setose appendages, dactylus absent. Pereopods 2–4 cylindrical, held close to mouthparts, able to extend past mouthparts, setae in rows, setae as long as segment, flexion between carpus and propodus present. Pereopods 5–7 with 2 ungues, secondary unguis robust. Female functional brood pouch majority made up of pereonite 4 (or 3 and 4). Oostegite 5 absent. Male penial plate narrow, apex simple. Male pleopod 1 with lateral notch, with 3 lateral setae, lateral setae of similar length. Male pleopod 2 with appendix masculina tapered, without ridge, distally not widened, straight, elongated. Uropodal exopod present, 3 setae on inner ramus.