Hyperionyx macrodactylus (Stephensen 1924)

Hyperionyx macrodactylus (Stephensen)

Hyperia macrodactyla Stephensen, 1924:90–91, fig. 35–Hurley, 1960b:279.–Vives, 1968:460.–Dick, 1970:56.

Hyperia (Parahyperia) macrodactyla Stephensen.–Yang, 1960:35–38, fig. 9.

DERIVATION OF NAME.–Not expressly stated; obviously refers to the long dactyls of P3–7.

TYPE-LOCALITY.–Mediterranean, from south of the Balearic Islands to the Sea of Marmora.

DIAGNOSIS.–With the characters of the genus.

RELATIONSHIPS.–This species, the sole representative of the genus, can be recognized immediately by the relatively short P5, illustrated clearly by Stephensen and by Yang. Supplementing their figures, illustrations are given here of the mouthparts, the head, showing the small pointed gland cone widely separate from the labrum, and the dactyls of P5–7. Yang shows a 2–merous A2, but I could not make out a suture in A2, possibly because I examined it only in situ.

DISTRIBUTION.–Mediterranean (Stephensen, 1924, 34 specimens from 4 stations; Vives, 1968); off Miami, Florida, in Florida Current (Yang, 1960, 2 ♀); South Atlantic, off South Africa (Dick, 1970); Fiji Islands (Hurley, 1960, 1 ♂). Presumably these records represent only a small part of its range.