Six new species and three new records of infaunal alpheid shrimps from the genera Leptalpheus Williams, 1965 and Fenneralpheus Felder & Manning, 1986 (Crustacea, Decapoda) Author Anker, Arthur text Zootaxa 2011 3041 1 38 journal article 46283 10.5281/zenodo.278802 275e1f6f-69ff-4f2e-a9a9-0d1cb7d286d8 1175-5326 278802 Leptalpheus sp. 1 Figs. 18A –E, 19A, B Material examined. 1 female (cl 4.9 mm ), MNHN-IU-2011-5244, Panama , Caribbean coast, Bocas del Toro, Isla Carenero, sandflat with seagrass, yabby pump, 0.5–1 m , leg. A. Anker, J.A. Vera Caripe, J.A. Baeza, 18.11.2006 [fcn 06-600]; 1 male (cl 8.3 mm ), MNHN-IU-2011-5245, Panama , Caribbean coast, Bocas del Toro, Isla Colón, STRI Bay, off STRI station dock, seagrass flat, yabby pump, 0.5–1 m , leg. A. Anker, B. Martínez-Guerrero, 14.08.2008 [fcn 08-241]. Remarks. These two incomplete specimens, both missing their major chelipeds, appear to belong to a further undescribed species of Leptalpheus . This species may be closely related to L. pierrenoeli , a species described and currently known only from Isla Grande on the Caribbean coast of Panama ( Anker 2008 ). The main differences observed between Leptalpheus sp. 1 and L. pierrenoeli are the more slender minor chela, with a slightly different armature on the fingers (cf. Fig. 18 C and Anker 2008 , fig. 2F, G); and the antennular peduncles with a distinctly longer, more slender second article, and with a shorter stylocerite, not reaching distal margin of the first article (cf. Fig. 18A and Anker 2008 , fig. 1A). The colour pattern of Leptalpheus sp. 1 is similar to that of most other species of Leptalpheus , viz. semitransparent speckled with reddish chromatophores forming diffuse bands on the abdomen ( Fig. 19A , B). Complete specimens, with the diagnostic major cheliped, are needed to conclude about the identity of this species.