Heteronymphon bioculatum Turpaeva 1956

Heteronymphon bioculatum Turpaeva

Heteronymphon bioculatum Turpaeva, 1956:67 [key], 69–71, fig. 2.—Stock, 1965:22 [text].—Turpaeva, 1970:1723–1725 [text], figs. 1(4), 2(4); 1971:279–280; 1973:180–181.—Nakamura, 1985:33 [key].

MATERIAL EXAMINED.—OREGON: Cr 7206B, sta BMT 292-31 (1);cr 7206B, sta BMT 294–33 (1 with eggs); cr 7303A, sta BMT 323–47 (2);cr 7310B, sta BMT 334–39 (1).

WASHINGTON: Cr DWD, sta BMT-10 (1 ovigerous).

DISTRIBUTION.—This rare species of a rare deep-water genus has been found along the Kuril-Kamchatka Trench, in the Sea of Japan, in the Sea of Okhotsk, and in the Gulf of Alaska, in depths of 756–3940 m. These six specimens captured off the Strait of Juan de Fuca in 2030 m and off Oregon in 2997–3000 m greatly extend the known distribution for this species well to the south and into temperate waters in the eastern Pacific. The species is, as far as is known, confined to the temperate and arctic slopes and basins of the North Pacific Ocean.

DIAGNOSIS.—Ocular tubercle well developed with large anterior pair of eyes, posterior pair either inconspicuous or lacking. With two of above males, anterior pair of eyes quite conspicuous and slightly pigmented, smaller posterior pair of eyes present, but very inconspicuous, apparently unpigmented. Lateral processes well separated in quite slender species. Terminal palp segment shorter than penultimate segment. Oviger claw short, without teeth, no longer than distal denticulate spines of terminal segment. Spines with either two or three lateral lobes. Propodus slightly shorter than slender tarsus with terminal claw little more than half length of propodus. Male cement gland apertures several inconspicuous ventral pores on femorae. Male carrying eggs from station BMT 294-33 with single small strip of dark eggs wound around left oviger.