Leptalpheus

Anker, Arthur, 2011, Six new species and three new records of infaunal alpheid shrimps from the genera Leptalpheus Williams, 1965 and Fenneralpheus Felder & Manning, 1986 (Crustacea, Decapoda), Zootaxa 3041, pp. 1-38 : 26

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.

Figures

FIGURE 1. Leptalpheus marginalis sp. nov.: all except I—holotype, male from Ciénaga Porto Nao, Caribbean coast of Colombia (USNM 1155316); I—paratype, male from the same locality (USNM 1155317): A, frontal region, dorsal view; B, same, lateral view; C, same detail of anterolateral margin and orbital crests; D, telson, dorsal view; E, ventromesial tooth on first article of antennular peduncle, lateral view; F, lateral antennular flagellum, lateral view; G, scaphocerite, dorsal view; H, antennal flagellum, lateral view; I, third maxilliped, lateral view; J, second pereiopod, lateral view; K, third pereiopod, lateral view; L, appendix masculina and appendix interna, dorsal view; M, uropod, dorsal view (setae omitted).

FIGURE 18. A – E— Leptalpheus sp. 1, male from Bocas del Toro, Caribbean coast of Panama (MNHN-IU- 2011 - 5245): A, frontal region, dorsal view; B, minor cheliped, lateral view; C, minor chela fingers, mesial view; D, third pereiopod, lateral view; E, uropodal protopod and exopod, dorsal view; F – J— Leptalpheus sp. 2, female from Bocas del Toro (MNHN-IU- 2011 - 5246): F, frontal region, dorsal view; G, major chela fingers, mesial view; H, second pereiopod, mesial view; I, third pereiopod, lateral view; J, uropodal protopod and exopod, dorsal view.