Abyssocypris abyssophilia (Maddocks 1969)

Australoecia abyssophilia

ETYMOLOGY.—Greek abyssos, the deep sea + philios, loving.

TYPE-SPECIMENS.—Holotype USNM 121237, paratypes USNM 121238–121245.

TYPE-LOCALITY.—"Anton Bruun” cruise 7 station 363G.

DIAGNOSIS.—Carapace extremely robust, yellowish white color; shape ovoid with varying proportions, left valve much larger than and overlapping right valve and of rounder outlines. Well-developed hinge consisting in right valve of straight bar with overlying “accommodation groove,” in left valve of deep straight groove with overlying incised shelf. Larger forms with widened marginal zone and deep restricted anterior vestibule; more abundant smaller forms (juveniles?) with narrow regular marginal zone and no vestibules. Muscle-scar pattern very large, located dorsomedially, consisting of a very compact arrangement of five triangular scars.

MATERIAL.—Forty subfossil specimens from “Anton Bruun” stations 363 G, K, 356D, 380A, 397D, and 407 in the Mozambique Channel and “Albatross” 2763 in the western Atlantic.

DIMENSIONS.—Specimen USNM 121237: left valve, length 0.92 mm, greatest height 0.53 mm, located 0.40 mm from anterior.

Specimen USNM 121240: left valve, length 0.93 mm, greatest height 0.56 mm, located 0.47 mm from anterior.

Specimen USNM 121239: left valve, length 0.59 mm, greatest height 0.40 mm, located 0.34 mm from anterior.

Specimen USNM 121238; right valve, length 0.60 mm, greatest height 0.36 mm, located 0.31 mm from anterior.

Australoecia species 1

MATERIAL.—One subfossil specimen from “Albatross” station 4693 in the southeast Pacific.

DIMENSIONS.—Specimen USNM 121247: right valve, length 0.52 mm, greatest height 0.29 mm, located 0.22 mm from anterior.