Citation: Hastigerinella simplex Morrow 1934Rank: SpeciesType specimens: Plate 30, figures 6a; 75376Type age (chronostrat): CenomanianType locality: Sec. 31, T. 21 S., R. 22 W., Hodgeman County, KSType repository: Washington; USNM
Original Description Test moderately trochoid; chambers in the early portion globular, the penultimate chamber becoming slightly elongate and the final chamber strongly elongate and evenly rounded at the end; chambers about 4 in the final whorl; sutures distinct, moderately depressed; wall finely spinose; aperture indistinct. Size: Diameter 0-50 mm., thickness about 0.2 mm. Etymology: Extra details from original publication It is with some hesitation that this species is excluded from Globigerina for if the final chamber were lacking it would certainly be placed in this genus. However as H. simplex falls so nicely into the evolutionary series of the genus I am considering it as distinct from Globigerina. This species seems to be even more primitive than H. moremoni Cushman (34, p.86, pl. 11, figs. 1-3) which shows the elongation of the chambers at an earlier stage and an expansion of the later chambers toward the tip. It seems probable that this species represents very nearly the lowest limit of the genus. The Tertiary species H. eocanica Nuttall (27, p. 376, pl. 50, figs. 9-11) has bluntly rounded chambers but, as other species of the genus, differs in the earlier development of the elongated chambers. Hastigerinella simplex has been found only in the Greenhorn formation. This species has been found in samples from several Hartland shale localities, but is not known to occur in other members.
Cushman, J. A. (1946). A rich foraminiferal fauna from the Cocoa sand of Alabama. Cushman Laboratory for Foraminiferal Research, Special Publication. 16: 40-. gs
Morrow, A. L. (1934). Foraminifera and ostracoda from the Upper Cretaceous of Kansas. Journal of Paleontology. 8: 186-205. gs
Hastigerinella simplex compiled by the pforams@mikrotax project teamviewed: 4-10-2022