Hyperietta luzoni (Stebbing 1888)

Hyperia luzoni Stebbing.–Vosseler, 1901:64–66, plate 5: figs. 16–28

DERIVATION OF NAME.–The species is named for the distinguished English carcinologist, T. R. R. Stebbing.

TYPES.–All from CalCOFI Cruise 9, station 607, 12 November 1949, off central California, 35°58′N, 127°51′W, oblique tow from 66 m to surface. Holotype ♀ USNM 137510, allotype ♂, USNM 137511, 20 ♀ and 7♂ paratypes, USNM 137512; 2 ♀ and 2 ♂ paratypes deposited at Scripps Institution of Oceanography.

DIAGNOSIS.–Length of ♀ 2–3 mm, of ♂ 3–4 mm. Head about twice as high as long, evenly rounded ventrally. ♀ A1 reaching ventral margin of head. Gland cone barely reaching ventral margin of head, broadly rounded, separated from epistome by distinct gap in lateral view. Lacinia of left Md with about 8 teeth. Outer lobe of Mxp ⅓ longer than wide, bearing a series of spines on both surfaces near distal margin and scattered minute setules on distal part of anterior margin. S2 of P1 slightly more than twice as long as wide, both margins moderately convex; s5 with very small carpal process bearing 3–4 spines, posterior margin otherwise unarmed; s6 about twice as long as broad, with 2–3 spines on anterior margin. S6 of P2 bearing 2 spines on anterior margin. P6 only slightly longer than P5 and P7; s2 slightly wider in P5 than in P6–7, anterior margin convex and unarmed in P5, with 1 spine in P6, 2 spines in P7; s4 of ♀ with long spine at anterodistal corner, sometimes reduced or absent; s4 of ♂ with 2 shorter spines on anterior margin; s5 of ♀ always with long spine at anterodistal corner; s5 of ♂ with smaller spines at same position. Telson slightly shorter than width at base, in ♀ about 2/3, in ♂ slightly less than half of Up3 protopod.

DISTRIBUTION.–Warm parts of the Atlantic, Pacific, and Indian Oceans. In the CalCOFI area its distribution is similar to that of the much more abundant Lestrigonus schizogeneios, and it seems likely that H. stebbingi is also a transition zone species.

Hyperietta luzoni (Stebbing)

Hyperia luzoni Stebbing, 1888:1382–1384, pl. 166A.–Bovallius, 1889:212–214.–Lo Bianco, 1902:424, 425, 446 [identification by Vosseler]; 1903:table facing p. 278 [identification by Vosseler]; 1904:42.–Stewart, 1913:255.–Stephensen, 1924:84–86, fig. 34. Chart 12.–Pirlot, 1929:122–123; 1939:35.–Barnard, 1930:410.–Hurley, 1960b:279; 1969:pl. 19 [map].–Kane, 1962:301.

[not] Hyperia luzoni Stebbing.–Vosseler, 1901:64–66, pl. 5: figs. 16–28.–Stebbing, 1904:33–34.

DERIVATION OF NAME.–Not given, presumably for the type-locality.

TYPE-LOCALITY.–South China Sea, west of Luzon Island, Philippines, 16°35′N, 117°47′E.

DIAGNOSIS.–Length of ♀ 2–3 mm, of ♂ 3–4 mm. Head slightly more than twice as high as long, about half as long as pereon. Gland cone just reaching or barely exceeding ventral margin of head, posteroventrally overlapping anterior part of buccal mass. Mxp outer lobes subpyriform, bearing a few setae on distal margin and on shelf. P1 simple; s2 sinuate, proximal part strongly bulging anteriorly, distal part much narrower; s5 twice as long as wide, with 1 spine at midlength and 2 at distal end of posterior margin; s6 with 1 spine at midlength of anterior margin. P2 very slender, chelate; s2 about 6 times as long as wide; carpal process ⅓ as long as s6; s6 with 2 spines on anterior margin. P3–4 very slender. P5–7 with moderately broad s2; other segments slender; s4–5 without long spines. Telson round-triangular, slightly longer than wide; in ♀ about 5/6, in ♂ ½ as long as protopod of Up3.