Leptalpheus sp. 4

Material examined. 1 specimen of unkown sex (pleopods damaged, cl 3.5 mm), USNM 221794, Aruba, west end of Commandeurs Bay, 0.5 m, leg. R. Lemaitre, 0 1.1987 [det. R. Lemaitre as Salmoneus arubae (Schmitt)].

Remarks. This specimen from Aruba is missing its major cheliped and therefore cannot be positively identified. The frontal margin is somewhat produced anteriorly, similar to L. pierrenoeli (cf. Anker 2008) or Leptalpheus sp. 2. (Fig. 18 F). The second article of the antennular peduncle is distinctly longer than wide, longer that the first or the third. The ventromesial carina of the first article of the antennular article is terminated anteriorly by a simple, non-bifid, similar to that of L. marginalis sp. nov. (Fig. 1 E) and L. forceps. The third pereiopod is slender as in Leptalpheus sp. 1, but has a small spiniform seta on the ischium. The cutting edges of the minor chela fingers are serrated with small triangular teeth. The diaeresis of the uropodal exopod has no tooth or sharp angle lateral to the mesial incision; this angle is rather rounded as in Leptalpheus sp. 1 (Fig. 18 E). Complete specimens from Commandeurs Bay in Aruba are needed to elucidate the identity of this presumably undescribed species. Noteworthy, this is the first record of Leptalpheus for Aruba and the former Netherlands Antilles.