Caribboecetes

Paz-Ríos, Carlos E. & Ardisson, Pedro-Luis, 2013, Caribboecetes progreso, a new species of sand-dwelling amphipod (Amphipoda: Corophiidea: Ischyroceridae) from the Gulf of Mexico, with a key for the genus, Zootaxa 3652 (3), pp. 370-380 : 379

Key to species of Caribboecetes (modified from Just 1984)

1 Basis of gnathopod 2 with strongly triangular upward anterolateral flange......................................... 2

- Basis of gnathopod 2 without strongly triangular upward anterolateral flange...................................... 3

2 Rostrum not reaching beyond eyelobes; cephalon and first 4–5 pereonites dorsally with transverse rows of densely polyflagel- late setules; coxal plate and basis of pereopod 7 with densely setose lateral surface................. C. progreso sp. nov.

- Rostrum reaching beyond eyelobes; cephalon and pereon with a few scattered simple setules; coxal plate 7 and basis of pereo- pod 7 with smooth lateral surface.................................................................... C. justi

3 Cephalon and first 3–5 pereonites with transverse rows of setules dorsally......................................... 4

- Cephalon and pereon at most with scattered dorsal setules..................................................... 5

4 Eyelobes with apical projection; peduncular article 5 and flagellar article 1 of antenna 2 with dorsolateral setae in a single dis- tinct row; coxal plate and basis of pereopod 7 with densely setose lateral surface........................ C. jenikarpae

- Eyelobes apically rounded; dorsolateral setae on peduncular article 5 of antenna 2 not in a single row; coxal plate 7 and basis of pereopod 7 with smooth lateral surface....................................................... C. barbadensis

5 Rostrum curved strongly downward; article 1 of antenna 1 with broad, marginally setose lateral “wing”...... C. pterycornis

- Rostrum straight; article 1 of antenna 1 normal................................................... C. intermedius