Citation: Hastigerina (Bolliella) adamsi Banner & Blow 1959Rank: SpeciesType specimens: Holotype: 19184.108.40.206. Paratype: 19220.127.116.11. [Mineralogy Department numbers]Type age (chronostrat): ExtantType locality: The type specimens were collected by the Challenger Expedition from 580 fathoms off the Kai (Ewab) Islands (Challenger Station 191A).
NB Challenger station 191A was located at -5.44N; 133.32E; and sampled on 24 September 1874Type repository: London, UK; NHM
Original Description The adult test is very slightly trochoid, being almost, but not perfectly, planispiral. The globular proloculum is followed by a whorl of about six rapidly enlarging subglobular chambers in the megalospheric generation; the microspheric generation is not known. The juvenile aperture extends from the ventral umbilicus to the periphery and reaches an interiomarginal equatorial position, but is clearly asymmetrical and Hastigerina-like. In the succeeding whorl (also ofabout six chambers) the chambers are more nearly planispiral and become radially elongate without lateral compression; the chambers may become four times as high as broad. The later chambers are more loosely coiled, and by the end of the second whorl the test is almost equally biumbilicate, and the aperture has an equal extension into each umbilicus. A very thin and narrow, very finely perforate, aperturallip is present on the later chambers. extending back along the umbilical border of each chamber to meet the preceding chamber. The last formed adult chamber may be in contact only with the immediately preceding chamber, and not directly attached to the penultimate whorl; when this occurs, the primary apertures of the later chambers are not wholly closed, and remain open as relict apertures, which occur first on the ventral umbilical margin. and then (often by the third whorl) on both ventral and dorsal umbilical margins. The wall of the test is thin, uniformly and finely perforate, distinctly and uniformly hispid. Size: Etymology: Extra details from original publication The specimens collected by Cushman, Todd, and Post (1954) came from the outer slopes of Bikini Atoll and from Sylvania Guyot (1954, pp. 321-2). No records of fossil occurrences of this species are known to us. Editors' Notes
Banner, F. T. & Blow, W. H. (1959). The classification and stratigraphical distribution of the Globigerinaceae. Palaeontology. 2(1): 1-27. gsVO
Hastigerina (Bolliella) adamsi compiled by the pforams@mikrotax project teamviewed: 4-10-2022