Description of Coutieralpheus setirostris, new genus, new species, an infaunal alpheid shrimp (Crustacea: Decapoda) from Florida, U.S.A.

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Coutieralpheus, new genus, is established for C. setirostris, new species, on the basis of two specimens, a complete male and an incomplete female, collected from burrows on the tidal flats bordering Fort Pierce Inlet on the Atlantic coast of Florida, U.S.A. The new genus belongs to a large group of alpheid genera characterized by the presence of a posteroventral articulated plate on the sixth abdominal pleuron. The holotype male bears robust, subsymmetrical and equal-sized chelipeds. The mesial side of the cheliped carpus bears several rows of short setae, which are present in only three other, non-related alpheid genera. The two thickened terminal setae on the rostrum are also diagnostic. Coutieralpheus appears to combine primitive and highly evolved features and is presumably related to the monotypic genus Deioneus Dworschak, Anker & Abed-Navandi from the Eastern Atlantic. However, in some characters the new genus also resembles the genera Salmoneus Holthuis, Alpheopsis Coutiere and Parabetaeus Coutiere. The host of C. setirostris remains unknown, although both the holotype and paratype were collected from substrates richly burrowed by thalassinidean shrimp, stomatopods, and large polychaetes.