PROC. BIOL. SOC. WASH. 102(3), 1989, pp. 701-715 RECTIFICATION OF HALIRAGES REGIS AND H. HUXLEYANUS (CRUSTACEA: AMPHIPODA), FROM MARINE ANTARTICA, WITH DESCRIPTION OF A NEW GENUS, AUSTROREGIA J. L. Barnard Abstract. —Halirages huxleyanus and H. regis are removed to the new ant-arctic genus, Austroregia. This leaves Halirages with 6 species entirely confined to arctic waters. Austroregia is a perplexing genus because it is furnished with calceoli of the same kind found in Chosroes and Gammarellus; a family Gam-marellidae is available for these two genera which would be removed from such families as Eusiridae, Pontogeneiidae and Calliopiidae, in which the genera would have been classified previously. Problems remain on speciation within Austroregia. Halirages huxleyanus (Bate) and H. regis (Stebbing) are improperly placed in Halira-ges and are removed to a new genus Aus-troregia. Austroregia huxleyana possesses distinctive calceoli of a kind also present in Gammarellus, Chosroes and Gondogeneia, adequate to justify the resurrection of the family Gammarellidae within the super-family Eusiroidea. This reinforces the dis-covery by Lincoln & Hurley (1981:111) that both the high arctic and high antarctic con-tain taxa with common ancestry in the gam-marellid group, a family first raised by Bousfield (1977), but soon after merged within the family Calliopiidae. Gammarellidae, revived Diagnosis. — Characterized by a type 6 calceolus of Lincoln & Hurley (1981) in which the proximal element forms a dis-crete cup separated from the small 2 to 3-plate distal element by a second smaller cup-shaped element (Fig. 1). Also unique is the arrangement of the calceoli in transverse rows that extend all around the distal mar-gin of the flagellar articles. Remarks. — The family Gammarellidae was established by Bousfield (1977) to con-tain two carinate genera, Gammarellus Herbst and Weyprechtia Stuxberg, separat-ed from other kinds of pontogeneiids by a combination of characters that included a well developed accessory flagellum, lanceo-late weakly setose third uropods, and lam-inar, apically emarginate telson. However, the distinction from other eusiroids was far from clear-cut and in a later updated and revised version of his classification, Bous-field (1983) synonymized the Gammarelli-dae with the Calliopiidae. The present use of calceolus morphology and arrangement as a shared apomorphy to resurrect the Gammarellidae produces a family of quite a different complexion. Brought together are four eusiroid genera, Gammarellus, Gondogeneia, Chosroes, and Austroregia, that would not have been rec-ognized as belonging to a natural and in-dependent group on the basis of traditional morphological characterizations. Thus, Gammarellus possesses a well developed multiarticulate accessory flagellum which is at best small to vestigial in Gondogeneia and
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