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 Meximaera Barnard Diagnostic characters Eyes round-oval. Body smooth. Mandible palp art1 obliquely ending, but distally no pointed prolongation, art3 slender, linear, shorter than art2. Mx1 inner plate slim; Mx2 inner plate with terminal and lateral setae, but no oblique setal row. Cx1 anterodistally characteristically rounded. Gnathopods ovoid, subchelate, symmetrical, palmar corner weak. Gn2 dactylus outer margin with no or one seta. Peraeopod dactyli simple. Epimeral plates smooth, with posterodistal tip. U3 with subequal rami, distally tapering, outer ramus minutely biarticulate. Telson deeply cleft, distally excavated. Key to Species 1. T with two distal robust setae of subequal and medium length. Gn 2 male palm with small U-shaped incision......... Meximaera briani ( 4–4.5 mm ) (Reported from the region by LeCroy 2000: 74 , fig. 123 under Ceradocus sp. B and described by Krapp-Schickel 2008a: 1425–1427 figs. 2–5, but lacking in this collection.) T distally with one long (usually longer than T itself) and one shorter robust seta. Gn 2 male palm without U-shaped incision, usually somewhat concave or regularly rounded.................. Meximaera diffidentia ( 4–6 mm )