Original Description Test is biserial throughout, symmetrical in edge view and with globular chambers. Proloculus is large (31–56 mm) and followed by smaller second chamber (fig. 4). Sutures are distinct, straight, and depressed. Aperture is an interiomarginal, low-to-high arch bordered by two symmetrically developed imperforate rims. Test surface is ornamented with continuous and discontinuous costae. Test wall is calcareous, hyaline, and intercostally microperforate to rarely finely perforate. Etymology: The Latin prefix globo (= globose) is added to the pre-existing genus name Heterohelix.
Extra details from original publication Remarks. Globoheterohelix differs from Protoheterohelix in having (1) a symmetrical test in edge view, (2) symmetrically developed periapertural structures consisting of imperforate rims, (3) globular chambers, (4) a large proloculus (fig. 5), and (5) costae. It differs from Planoheterohelix in having (1) a large proloculus that is also larger than the second chamber, (2) globular chambers, and (3) periapertural structures consisting of imperforate rims rather than flanges. Globoheterohelix differs from Heterohelix mainly in having (1) a large proloculus, (2) costate ornamentation, and (3) globular chambers without tubulospine-like projections.
Species included. Globoheterohelix paraglobulosa n. sp.
Geographic distribution. USA (Colorado, Kansas, South Dakota, Wyoming), Gulf of Mexico (Yucatan outer shelf), western North Atlantic (Blake Plateau), Caribbean region (Venezuelan basin), Africa (Egypt, Tanzania) and equato- rial Pacific (Mid-Pacific Mountains).
Georgescu, M. D. & Huber, B. T. (2009). Early evolution of the Cretaceous serial planktic foraminifera (late Albian-Cenomanian). Journal of Foraminiferal Research. 39: 335-360. gs
Globoheterohelix compiled by the pforams@mikrotax project teamviewed: 21-3-2023