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image of Crustaceana

In older literature, it has been claimed that the West Indian shrimp Lysmata intermedia also exists at Faial Island, in the Azores. It is now demonstrated here that these Azorean records of L. intermedia are actually based on L. seticaudata. Previous confusion probably arose from the very close similarity between the two species. L. intermedia is here redescribed on the basis of topotypical specimens (Dry Tortugas, Florida). It is shown that L. seticaudata displays significant geographical variations, the Atlantic specimens and particularly those of the Azores being more robust than those from the Mediterranean Sea. In L. seticaudata, the number of segments on the accessory branch of the outer antennular flagellum also increases with total body size. A synonymy and a brief account on their geographical distribution and their ecology are given for both species. Dans la littérature ancienne, la crevette caraïbe Lysmata intermedia a été signalée à l'île de Faial, dans l'archipel des Açores. Nous montrons ici que ces signalements sont erronés et résultent d'une confusion avec L. seticaudata. L'extrême similitude entre les deux espèces explique aisément ces identifications antérieures incorrectes. L. intermedia est redécrite à partir de spécimens de la localité-type (Dry Tortugas, Florida). Il appert que L. seticaudata présente certaines variations géographiques, les spécimens atlantiques, et tout spécialement ceux des Açores, étant plus robustes que ceux de la Méditerranée. Chez L. seticaudata, il ressort aussi que le nombre de segments de la branche accessoire du flagelle antennulaire externe augmente avec la taille de la crevette. Une synonymie est donnée pour les deux espèces, de même qu'un résumé des informations disponibles sur leur distribution géographique et leur écologie.

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