MAERIDAE ( Krapp-Schickel, 2008b )

Krapp-Schickel, Traudl & Vader, Wim, 2009, On some Maerid genera (Crustacea, Amphipoda, Maeridae) collected by the Hourglass Cruises (Florida). Part 1: Genera Anamaera, Ceradocus, Clessidra gen. nov., Jerbarnia, Maera, Meximaera, with a key to world Ceradocus, Journal of Natural History 43 (33 - 34), pp. 2057-2086 : 2058

Family MAERIDAE ( Krapp-Schickel, 2008b)

Key to Atlantic genera of Maeridae treated here

1. Cx 2 in male gigantic, P5–7 basis scarcely expanded....... Jerbarnia Croker Cx 2 male not enlarged, P5–7 basis expanded........................ 2

2. Gn2 dactylus outer margin with numerous setae............ Maera Costa Gn2 dactylus outer margin without numerous setae.................. 3

3. Gn2 dactylus outer margin usually with four setae..... Clessidra gen. nov. Gn2 dactylus outer margin with 1 or 0 setae......................... 4

4. Telson with only one distal tip on each lobe......................... 5 Telson lobes distally excavated, each with two tips of similar length...... 6

5. Mx1,2 fully setose medially, in Mx1 inner lobe triangular; Md palp art1 distally acutely lengthened............................. Ceradocus Costa Mx1,2 medially not setose, in Mx1 inner lobe slender; Md art1 distally rounded, obliquely ending.............. Anamaera Thomas and Barnard

6. Gn2 widened, palmar corner about 90°............................ 7 Gn2 ovate, palmar corner clearly more than 90°..................... 8

7. Ep3 posterior margin serrate....................... Maeracoota Myers Ep 3 posterior margin smooth..................... Maeropsis Chevreux

8. Cx1 anterodistally acutely pointed. Gn1 carpus longer than propodus. Ep3 serrate, Us1,2 with dorsal teeth, T each lobe with one distal robust seta longer than T lobes....................... Ruffomaera Krapp-Schickel Cx 1 anterodistally rounded. Gn1 carpus not longer than propodus. Ep3 smooth, Us1,2 rounded, T each lobe with two distal setae shorter than T lobes......................................... Meximaera Barnard