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 Krapp-Schickel, Traudl Vader, Wim Journal of Natural History 2009 2009-09-02 43 33 - 34 2057 2086 7P7JJ Croker Croker [635,829,1050,1074] Malacostraca Maeridae Jerbarnia Animalia Amphipoda 22 2077 Arthropoda genus   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 infemale short, in male Cx2 much longer than Cx1, 3, 4. Gn1 with elongate rectangular propodus. Gn 2 maleasymmetrical, 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. Tvery short, cleft halfway, lobes almost truncate, with weak apical spination. T 22 2077 2 2