Parafoxiphalus, Alonso de Pina, 2001

Pina, M. Alonso De, 2001, new phoxocephalids (Crustacea: Amphipoda: Phoxocephalidae) from the south-west Atlantic, Journal of Natural History 35 (4), pp. 515-537 : 516-517

Parafoxiphalus , new genus

Diagnosis

Female. Eyes medium, subovate, occluded with pigment. Antennae 1 and 2, ¯agella not reduced. Antenna 1, peduncle article 2 shorter than 1, ventral setae sparse. Antenna 2, peduncle article 1 simple, without any process; peduncle article 3 with one long lateral seta and three setules; peduncle article 4, facial spines in four rows; peduncle article 5 shorter than 4, facial spines in one group. Mandible, right incisor with three teeth; molar not triturative, medium size, elongate, plaque-shaped, bearing six spines and pubescence. Maxilla 1, palp biarticulate; inner plate with four setae. Maxilla 2, outer plate broader than inner. Maxilliped, inner plate with two apical spines; dactylus elongate, slender, bearing distinct, long apical nail.

Gnathopods similar, small; article 5 elongate; article 6 stout, longer than 5, poorly setose anteriorly, palms slightly oblique, almost transverse. Peraeopod 5, article 2 of broad form. Peraeopods 5 and 6, articles 4 and 5 of medium width. Peraeopod 7, article 2 posteriorly serrate. Peraeopods 5±7, dactylus with sharp acclivity.

Gills present on coxae 2±7. Oostegites on coxae 2±5.

Epimera 1 and 2 without posterior long setae.

Urosomite 1 with ventral group of setae. Urosomite 3 without special process. Uropod 1, peduncle medium length, shorter than rami, with basofacial setae and displaced enlarged apicomedial spine; rami with marginal spines. Uropod 2, peduncle strongly spinose dorsally; rami elongate, longer than peduncle, both with marginal spines. Uropods 1 and 2, peduncular apices without comb. Uropod 3 elongate; outer ramus, article 2 carrying two apical plumose setae, one short and one medium length; inner ramus shorter than article 1 of outer ramus; rami apically and marginally with plumose setae. Telson, each lobe with apical and dorsolateral spines.

Male. Eyes large, ovate. Antenna 1, peduncle article 1 medially with sensory brush of setae; primary ¯agellum elongate, longer than peduncle, with calceoli. Antenna 2, peduncle articles 3 and 4 dorsomedially with sensory brushes of setae; peduncle article 5 longer than 4, bearing numerous calceoli; ¯agellum very long, exceeding body length, calceolate.

Peraeopod 7, article 5 with two copulating spines, slender, long and straight.

Epimera 1 and 2, posterior margin without long setae.

Uropod 3, rami subequal in length, profusely plumose setose. Telson elongate.

Description

Rostrum fully developed, unconstricted. Upper lip, epistome unproduced. Mandible, right lacinia mobilis four-dentate and left bearing ®ve teeth; palp, article 1 short, article 2 scarcely setose, article 3 with oblique apex bearing cluster of spinesetae. Lower lip, outer lobes bearing cone. Maxilla 1, outer plate with 11 apical spines, one spine especially thickened. Maxilliped, inner plate thick, plumose setose; outer plate narrow, short, not reaching half of palp article 2.

Coxae 1±3, increasing in size posteriorly. Coxa 4 large, margins divergent. Peraeopods 3 and 4, article 6 with all spines medium width, widely spread in distal two-thirds of article and bearing mid-apical shorter spine.

Uropod 1, peduncle with dorsolateral spines con®ned apically. Uropods 1 and 2, rami with articulate apical spines. Telson with ordinary pair of dorsal plumose setules on each lobe.

Type species. Parafoxiphalus longicarpus n. sp.

Etymology

The generic name is derived from its resemblance to species of Foxiphalus . The speci®c name refers to the elongate condition of carpi on gnathopods 1 and 2.