Heterophoxus, Shoemaker, 1925

Andrade, Luiz F. & Senna, André R., 2020, A novel species of Heterophoxus Shoemaker, 1925 (Crustacea, Amphipoda, Phoxocephalidae) from southeast and southern Brazil, with an identification key to world species of the genus, European Journal of Taxonomy 592, pp. 1-16 : 14

Identification key to species of Heterophoxus of the world

1. Epimeral plate 3, posteroventral corner with an acute projection .................................................... 3

– Epimeral plate 3, posteroventral corner without projection ............................................................. 2

2. Uropod 1, rami subequal ................................................................................ H. opus Griffiths, 1975

– Uropod 1, outer ramus much shorter than inner ............................... H. cephalodens Griffiths, 1975

3. Epimeral plate 3, acute projection medium to long .......................................................................... 4

– Epimeral plate 3, acute projection short ............................................. H. videns K.H. Barnard, 1930

4. Pereopod 7, basis reaching apex of merus ........................................................................................ 5

– Pereopod 7, basis not reaching apex of merus .................................................................................. 7

5. Uropod 1, rami subequal ................................................................................................................... 6

– Uropod 1, inner ramus about twice the length of outer .... H. pellusidus Ren in Ren & Huang, 1991

6. Uropod 2, peduncle longer than inner ramus ........................ H. ophthalmicus (Schellenberg, 1925)

– Uropod 2, peduncle shorter than inner ramus ................................ H. ellisi Jarret & Bousfield, 1994

7. Antenna 2, article 4 without posteroproximal lobe .......................................................................... 8

– Antenna 2, article 4 with posteroproximal lobe .......................................... H. despard Alonso, 2012

8. Pereopod 4, coxa, posterodorsal margin with moderate to strong excavation ................................. 9

– Pereopod 4, coxa, posterodorsal margin with weak excavation ........ H. pennatus Shoemaker, 1925

9. Epimeral plates 1–3, posterior margin without setules ................................................................... 10

– Epimeral plates 1–3, posterior margin covered with setules ......................... H. shoemakeri sp. nov.

10. Pereopod 7, merus stout, posterodistal lobe produced ................... H. trichosus K.H. Barnard, 1932

– Pereopod 7, merus slender, posterodistal lobe not produced ................. H. oculatus (Holmes, 1908)