Paracallisominae

Horton, Tammy & Thurston, Michael H., 2015, A revision of the genus Paracallisoma Chevreux, 1903 (Crustacea: Amphipoda: Scopelocheiridae: Paracallisominae) with a redescription of the type species of the genus Paracallisoma and the description of two new genera and two new species from the Atlantic Ocean, Zootaxa 3995 (1), pp. 91-132 : 93

Key to the genera of Paracallisominae

1. Gnathopod 1, basis expanded (glandular?).................................................................. 2

- Gnathopod 1, basis ordinary............................................................................. 4

2. Maxilla 1, inner plate fully setose along medial margin........................................................ 3

- Maxilla 1, inner plate with only 1 pappose apical seta.............................................. Anisocallisoma

3. Maxilliped palp article 4 vestigial; posteroventral lobe of pereopod 4 coxa strongly narrowed, subacute.......... Tayabasa

- Maxilliped palp article 4 well developed; posteroventral lobe of pereopod 4 coxa broad, subquadrate.......... Eucallisoma

4. Pereopods 3 to 7 or only pereopods 3 and 4 strongly prehensile................................................. 5

- Pereopods 3 to 7 not prehensile........................................................................... 6

5. Pereopods 3 and 4 prehensile; gnathopod 1 elongate, slender, longer than gnathopod 2; pereopods 3 and 4 carpus strongly com- pressed, shorter than wide; pereopod 5 basis subrectangular...................................... Scopelocheiropsis

- Pereopods 3 to 7 prehensile; gnathopod 1 not elongate, robust, subequal to gnathopod 2; pereopods 3 and 4 carpus longer than wide; pereopod 5 basis suboval....................................................... Haptocallisoma gen. nov.

6. Coxae 1 and 2 tapering distally........................................................................... 7

- Coxae 1 and 2 subrectangular, not tapering distally........................................................... 8

7. Maxilla 1 palp 2-articulate, maxilliped palp article 4 well developed........................ Pseudocallisoma gen. nov.

- Maxilla 1 palp 1-articulate, maxilliped palp article 4 absent........................................ Austrocallisoma

8. Pereopod 5 basis subcircular; gnathopod 1 propodus strongly tapering................................ Bathycallisoma

- Pereopod 5 basis pyriform; gnathopod 1 propodus subrectangular.................................... Paracallisoma