Centromedon

Horton, Tammy & Thurston, Michael, 2011, Centromedon zoe (Crustacea: Amphipoda: Lysianassoidea: Uristidae), a new deep-water scavenger species from the North Atlantic, with a key to the genus Centromedon, Zootaxa 2869, pp. 54-62 : 61

Key to the species of Centromedon

1. Gnathopod 1 simple; pereopod 7, basis with prominent postero-distal spur........... Centromedon calcaratus ( Sars, 1879)

- Gnathopod 1 subchelate; pereopod 7, basis lacking prominent postero-distal spur................................... 2

2. Lateral cephalic lobe strongly projecting, acute; epimeron 3 with postero-distal corner produced into an acute strongly upcurved tooth........................................................... Centromedon productus ( Goës, 1866)

- Lateral cephalic lobe subacute; epimeron 3 produced into an acute tooth, not strongly upcurved........................ 3

3. Coxa 1 tapering strongly, sub-triangular; gnathopod 1 propodus sub-triangular, palmar angle obscure................... 4

- Coxa 1 tapering weakly; gnathopod 1 propodus sub-rectangular, palmar angle distinct............................... 5

4. Lateral cephalic head lobe short, sub-triangular; dactyls of pereopods 3 and 4 longer than propodus; article 4 of maxillipedal palp vestigial............................................................. Centromedon pavor ( Barnard, 1966)

- Lateral cephalic head lobe produced, sub-acute; dactyls of pereopods 3 and 4 shorter than propodus; article 4 of maxillipedal palp short............................................................ Centromedon pumilus ( Lilljeborg, 1865)

5. Urosomite 1 with distinct triangular acute carina............................................................ 6

- Urosomite 1 lacking distinct triangular acute carina............................... Centromedon typhlops ( Sars, 1879)

6. Gnathopod 2 chelate.................................................... Centromedon mediator ( Barnard, 1962)

- Gnathopod 2 minutely subchelate......................................................................... 7

7. Gnathopod 1 basis setose anteriorly; pereopods 3 and 4 dactyls subequal in length to propodus; coxa 1 concave anteriorly................................................................................... Centromedon zoe sp. nov.

- Gnathopod 1 basis with two setae anteriorly; pereopods 3 and 4 dactyls longer than propodus; coxa 1 convex anteriorly.............................................................................. Centromedon laevis ( Bonnier, 1896)