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A new species of benthic amphipod, Ampetisca parapacifica, is described from the southeastern Gulf of Mexico and compared with the closely allied Ampelisca pacifica Holmes, 1908, from the eastern Pacific. Tfie distinctive form of the third uropod separates this species pair from other members of the "mauocephala" subgroup of the genus Ampelisca Kroyer, 1842. Ampelisca parapacifica is distinguished from A. pacifica by antenna I peduncle segment 2 less t}an twice the length of article 1 and uropod I peduncle shorter than the rami. Previous Atlantic records of,4. pacifica are assigned to the proposed new species. The Pacific populations of A. eschrichtii pacifica Gurjanova, 1955, were elevated to the species rank by Karaman, unaware that the name A. pacifica was preoccupied. A substitute name, A. karamani, nomen novum, is designated for the form described by Gurjanova. Twelve of the 17 species of the genus,4mpelisca Kroyer, populations previously assigned to A. pacifica represent a 1842, reported from the Gulf of Mexico were originally desnew species. cribed from the Pacific Ocean (Barnard 1954b, Goeke and Heard 1983). Recently, one of these 12 nominal species has Ampelisca parapocrlrca new species been elevated to species rank in the western Atlantic (Figuresl'2and3) (Ampelisca bicainata Goeke and Heard, 1983).Ampelisca Ampelisca pacificai Barnard, 1954b, p. 5; Mills, 1967, p. pacifica Holmes, 1908, has been reported with a transpan649 (not A. pacifica: Karaman 1975). amic distribution by several authors (Barnard 1954b, Mills 1965, McKin ney 1971).However, a more detailed compariMaterial Examined son of specimens from waters off California and the southHototype I 9, 8 mm, USNM 195114, 27"52'31"N, eastern Atlantic coast indicate that the western Atlantic 83o33'56"W, 17 June 1974,33 m, clayey, sandy silt. Poratypes USNM 195116: I 6, 4 99, same collection data as holotype ; USNM lg 5 l24 2 99 (1 ovig), 24o 47'30"N, Figure l. Ampelisco porapacifica, new species. 33t Manuscript received May I 0, 1 984; accepted July 9, I 984.

gulf research reports

Amphipods of the Family Ampeliscidae (Gammaridea). III. Ampelisca parapacifica, a New Species of Amphipod from the Western North Atlantic with the Designation of a Substitute Name for A. eschrichtii pacifica Gurjanova, 1955