Anisocallisoma Hendrycks & Conlan, 2003

Kilgallen, Niamh M. & Lowry, James K., 2015, A review of the scopelocheirid amphipods (Crustacea, Amphipoda, Lysianassoidea), with the description of new taxa from Australian waters, Zoosystematics and Evolution 91 (1), pp. 1-43 : 7

Anisocallisoma Hendrycks & Conlan, 2003

Anisocallisoma Hendrycks & Conlan, 2003: 2313.

Type species.

Anisocallisoma armigera Hendrycks & Conlan, 2003, by monotypy.

Included species.

Anisocallisoma includes one species: Anisocallisoma armigera Hendrycks & Conlan, 2003.

Diagnostic description.

Mandible lacinia mobilis a long, slender robust seta. Maxilla 1 inner plate with apical pappose setae only; palp 1-articulate. Maxilla 2 inner and outer plates subequal in width and in length. Maxilliped palp article 4 reduced. Gnathopod 1 coxa reduced, margins tapering distally; basis swollen; dactylus reduced, simple. Pereopods 3 and 4 carpus short, longer than wide. Pereopod 4 coxa with weakly-developed, subacutely produced posteroventral lobe.

Discussion.

Anisocallisoma can be distinguished from all other paracallisomines by the reduction in the number of setae of the maxilla 1 inner plate. It is most similar to Eucallisoma Barnard, 1961, and Tayabasa gen. n. They share the following characters: gnathopod 1 basis swollen, glandular; dactylus reduced, simple. It is also very similar to the new genus Austrocallisoma , but it can be distinguished from all of these taxa in lacking the distal tuft of setae on the accessory flagellum, and in having a much more weakly-developed posteroventral lobe on the pereopod 4 coxa, as well as the reduced setae on the maxilla 1.