Tryphosa, Boeck, 1871

Kilgallen, N. M. & Lowry, J. K., 2014, The Tryphosa group (Crustacea: Amphipoda: Lysianassoidea: Lysianassidae: Tryphosinae), Zootaxa 3768 (5), pp. 501-545 : 503

Key to genera

1. Gnathopod 1 parachelate................................................................................ 2

- Gnathopod 1 subchelate................................................................................ 3

2. Gnathopod 1 coxa large, nearly as long as coxa 2, not tapering........................................ Glorieusella

- Gnathopod 1 coxa vestigial................................................................... Metambasia

3. Gnathopod 1 coxa large, nearly as long as coxa 2, not tapering................................................ 4

- Gnathopod 1 coxa tapering............................................................................. 5

- Gnathopod 1 coxa vestigial............................................................................ 6

4. Mandible molar a triturating, strongly-developed column. Uropod 3 inner ramus slender, distinctly shorter than article 1 of outer ramus, subequal in length to peduncle.......................................................... Bruunosa

- Mandible molar a triturating, reduced column. Uropod 3 inner ramus broad, subequal in length to article 1 of outer ramus, distinctly longer than peduncle...................................................................... Tryphosa

5. Antenna 2 peduncle article 3 enlarged in male. Gnathopod 1 carpus slightly longer than propodus............ Thrombasia

- Antenna 2 peduncle article 3 not enlarged in male. Gnathopod 1 carpus shorter than propodus................. Gronella

6. Gnathopod 1 strongly subchelate; carpus slightly to strongly shorter than propodus; palm transverse to slightly obtuse, convex. Uropod 3 rami without plumose setae.......................................................... Pseudonesimus

- Gnathopod 1 subchelate; carpus slightly longer than propodus; palm acute, straight to concave. Uropod 3 rami with plumose setae in male................................................................................ Schisturella