Harpiniopsis naiadis J. L. Barnard 1960

Harpiniopsis naiadis J. L. Barnard

Harpiniopsis naiadis J. L. Barnard, 1960b, pp. 336–339, pl. 73; 1966a, p. 85; 1967a, p. 134, fig. 52g,h.

MATERIAL.—Stations 7 (1), 36 (1).

A strong possibility exists that this species is synonymous with H. fulgens J. L. Barnard (1960b). The two species differ in the following ways according to the original material: H. naiadis has a blunt and weak prolongation of pleonal epimeron 3, whereas H. fulgens has a sharp and moderately strong prolongation; H. naiadis has a weak cephalic tooth and H. fulgens has a strong tooth (see original figures for proportions); the spines on the peduncle of uropod 2 are slightly more elongate than in H. naiadis. Barnard (1967a) reports on specimens of H. naiadis with pleonal epimeron 3 somewhat intermediate between the extremes of the two species, and the specimens at hand from Oregon also have a slightly pointed attenuation on epimeron 3, but they have the small cephalic process and one or two setae on either ramus of uropod 2. Otherwise the length of setae on uropod 2 seems to be a character without much value in this case because the differences are relatively minor. The depth records of 2,800 m for the Oregon material far exceed 976 m reported for H. naiadis prior to Barnard (1967a) but are close to the maximum depth of H. fulgens, 2,667 m.

DISTRIBUTION.—Oregon to Baja California, 338–2,800 m.