Quadrimaera

Senna, André R. & Serejo, Cristiana S., 2007, Two new species of Quadrimaera (Crustacea: Amphipoda: Melitidae) from Atol das Rocas, Brazil, Zootaxa 1593, pp. 55-67 : 66

Key to species of Quadrimaera from Atol das Rocas

1. Palm of gnathopod 2 transverse, with two U-shaped medial concavities and a distal elliptical concavity preceding the palmar corner; telson deeply cleft ........................................................................................ 2

- Palm of gnathopod 2 obtuse, with a large medial concavity and palmar corner produced into a stout process slightly surpassing dactylus articulation ................................................................ Q. chaelata sp. nov.

2. Palm of gnathopod 2 with proximal concavity shorter than the next one; dactylus with inner margin naked; pereopods 5–7 with posterodistal lobe well developed; telson with four distal setae and two plumose small setae on lateral margin ........................................ Q. cristianae Krapp-Schickel & Ruffo, 2000

- Palm of gnathopod 2 with proximal concavity longer than the next one; dactylus with inner margin bearing a stout spine opposite the proximal concavity on the palm; pereopods 5–7 with posterodistal lobe not well developed; telson with four setae and an apical nail and three small setae on lateral margin .............. ................................................................................................................................... Q. rocasensis sp. nov.