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 Author Krapp-Schickel, Traudl Author Vader, Wim text Journal of Natural History 2009 2009-09-02 43 33 - 34 2057 2086 http://dx.doi.org/10.1080/00222930903091007 journal article 10.1080/00222930903091007 1464-5262 5216911 Genus Jerbarnia Croker Diagnostic characters Eyes ovate. Pleon and urosome dentate. A1 peduncle subequal to flagellum, peduncular art2 unusually long, acc. flagellum short. A2 flagellum not longer than art5 of peduncle. Mx1,2 not medially setose, without facial setae. Mxp dactylus lacking. Cx 1–4 in female short, in male Cx2 much longer than Cx1, 3, 4. Gn1 with elongate rectangular propodus. Gn 2 male asymmetrical, the smaller like the one in female, the larger with elongate basis and ischium, propodus subrectangular, palm oblique, sculptured. Pleopods with one-articulate rami. U3 greatly extended, magniramous. T very short, cleft halfway, lobes almost truncate, with weak apical spination .