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KEYWORDS: Western Atlantic Region, Goneplacoidea, nomenclature, new combination, new genus, Région atlantique occidentale, Goneplacoidea, nomenclature, combinaison nouvelle, genre nouveau
The identities of the Western Atlantic brachyuran crabs Frevillea barbata A. Milne-Edwards, 1880, F. rosaea A. Milne-Edwards, 1880, F. tridentata A. Milne-Edwards, 1880, and F. sigsbei A. Milne-Edwards, 1880, originally placed in Goneplacidae MacLeay, 1838, are clarified on the basis of the examination of type material as well as of additional specimens. The correct identity of the type material of the four species is resolved. A new genus, Diuplax n. gen., is described for F. sigsbei, which had previously been transferred to GoneplaxLeach, 1814 (family Goneplacidae). The new genus is distinguished from Goneplax s. str. by having a short cheliped merus that possesses a low submedian tubercle on its dorsal margin (elongated merus with a distinct short submedian spine on its dorsal margin in Goneplax s. str.) and the unarmed dorsal margin of the meri of the ambulatory legs (with distinct subdistal spine in Goneplax s. str.). Frevillea barbata and F. rosaea are now in the Euryplacidae Stimpson, 1871, F. sigsbei is in Diuplax n. gen. (Goneplacidae, Goneplacoidea MacLeay, 1838), whereas F. tridentata is in Trapezioplax Guinot, 1969 in Pseudorhombilidae Alcock, 1900 (Xanthoidea MacLeay, 1838).
Notes sur la taxonomie de Frevillea A. Milne-Edwards, 1880 (Crustacea, Brachyura, Goneplacoidea), avec la description d'un nouveau genre pour F. sigsbei A. Milne-Edwards, 1880.
L'identité des crabes de la région atlantique occidentale Frevillea barbata A. Milne-Edwards, 1880, F. rosaea A. Milne-Edwards, 1880, F. tridentata A. Milne-Edwards, 1880, et de F. sigsbei A. Milne-Edwards, 1880, originalement placés dans les Goneplacidae MacLeay, 1838, est clarifiée sur la base de l'examen des spécimens types ainsi que de spécimens additionnels. L'identité correcte du matériel type des quatre espèces est résolue. Un nouveau genre, Diuplax n. gen., est décrit pour F. sigsbei, antérieurement transféré dans GoneplaxLeach, 1814 (Goneplacidae). Le nouveau genre se distingue de Goneplax s. str. par le court mérus du chélipède doté d'un faible tubercule submédian sur le bord dorsal (mérus nettement plus allongé, avec une courte épine sur le bord dorsal chez Goneplax s. str.) et le bord dorsal du mérus des pattes ambulatoires sans épine (une épine subdistale chez Goneplax s. str.). Frevillea barbata et F. rosaea font maintenant partie des Euryplacidae Stimpson, 1871 et F. sigsbei est dans Diuplax n. gen. (Goneplacidae, Goneplacoidea MacLeay, 1838), tandis que F. tridentata est dans Trapezioplax Guinot, 1969 dans les Pseudorhombilidae Alcock, 1900 (Xanthoidea MacLeay, 1838).
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