Citation: Globigerina? cristatiformis McCulloch 1977Rank: speciesType specimens: holotype (fig. 12), AHF 2576; paratype (fig. 11), AHF 2575. Type age (chronostrat): RecentType locality: In 860-1150 fms. on Velero Station 6000, 11°54N, 165°02E, off Bikini Atoll, South Pacific.Type repository: Los Angeles, Univ Southern California, Allan Hancock Foundation
Original Description Test free, calcareous, minute lenticular, trochospiral biconcave, periphery deeply lobulate, broadly rounded; wall some what smooth, finely per forate to coarsely perforate cancellate, slightly hispid, slightly hyaline to opaque; dorsal side evolute, about two whorls of subglobose chambers increasing gradually in size, about seven chambers in last formed whorl; sutures dorsally depressed, radial, spiral suture lobulate; ventral side involute, one whorl of six or seven chambers more uniform in texture inner ends tapering off to converge to close umbilicus (fig. 12) or the last formed chamber extended to cover umbilical area as in genus Globigerinoides Cushman, 1927, (fig. 11, six chambers), aperture in ter preted to be interiomarginal extraumbilical umbilical extending from umbilicus to periphery; no supplementary structures observed in fig. 11; sutures ventrally radial and depressed. Size: Holotype (fig. 12).144mm dia. x.085mm; paratype (fig. 11).124mm dia. x.099mm. Extra details from original publication This species differs from Globigerina? guadalupensis McCulloch, 1977, in number of structure and texture of chambers. Essentially the same dimorphism is present in this species suggesting alternating generations of the life cycle. Globigerina cristata Heron-Allen and Earland, 1929, is suggested but the present species shows less differentiation of texture and chambers less elongate and spinous.
McCulloch, I. A. (1977). Qualitative observations on Recent foraminiferal tests with emphasis on the eastern Pacific (3 vols). University of Southern California, Los Angeles. -. gs
Globigerina cristatiformis compiled by the pforams@mikrotax project teamviewed: 22-3-2023