dcsimg

Description

provided by NMNH Antarctic Invertebrates

Heterophoxus videns, n. sp.

? Walker, 1907, p. 17 (Harpinia obtusifrons, non Stebb.) ; ? Chilton, 1909, p. 619 (H. obtusifrons, non Stebb.) ; ? Stephensen, 1927, p. 306 (H. obtusifrons, non Stebb.).

Occurrence.—Antarctic: 1. Sta. 220, 2 ♂♂7-8 mm., 2 ♀♀7.5 and 5.5 mm., 1 juv. 3 mm. Types. 2. Sta. 331, 2 ♀♀ 5-6 mm.

Description.—Antero-lateral angle of head truncate, with a very small point below the eye. Eyes oval, or slightly narrower above, much larger in ♂ than ♀. Side-plates 1--3 with lower margins even, without notch at postero-inferior angle, with fairly numerous long plumose setae. Pleon segments dorsally setulose in ♀ and juv., but scarcely so in ♂. Postero‑lateral margin of pleon segment 3 gently sinuous, postero-inferior angle produced in a short acute point, hind margin minutely setulose in ♀, smooth in ♂. Telson short, cleft nearly to base, lobes with apices rounded, each with 1 spine‑ on outer distal margin.

Antenna 1 of the Harpinia type (Sars, 1895, pl. 52), in ♀10-jointed, accessory flagellum 6-jointed, in ♂more slender, flagellum 13-jointed, one or two calceoli on basal joints, accessory flagellum 7-jointed. Antenna 2 in ♀like that of Harpinia, penultimate peduncular joint broad, triangular, ultimate joint much narrower, ovate, flagellum 10-jointed ; in ♂ of the Paraphoxus type (Sars, 1895, pl. 51), 3rd and 4th joint stout with thick brush of setae on upper margin, a group of stout spines at upper apex of 4th joint, 5th joint longer and narrower than 4th, upper margin with tufts of setae and 4-5 calceoli, flagellum extending to end of pleon segment 3, 36-40- jointed, nearly every joint calceoliferous. Mouth-parts similar to those of Harpinia plumosa (Sars, pl. 52). Gnathopods 1 and 2, peraeopods 1-4, cf. those of H. plumosa. Peraeopod 5, 2nd joint ovate, expanding distally and extending to end of 4th joint, hind margin with large rounded, teeth, with plumose setae in the notches. Uropods as in Paraphoxus oculatus (Sars, pl. 51) ; uropod 3 in ♀ inner ramus not so short compared with the outer ramus ; in ♂both rami subequal, with long plumose setae ; 2nd joint of outer ramus in ♀ minute, in ♂absent.

Remarks.—This species is distinguished from the Californian pennatus, Shoemkr., by the 3rd pleon segment and the rounded teeth on hind margin of 2nd joint of peraeopod 5.

Distribution (probably).—New Zealand, Auckland and Campbell Islands ; and McMurdo Sound ; having been wrongly recorded as the Kerguelen species Harpinia obtusifrons.”

(Barnard, 1930: 334-335)