Original Description Test trochoid, evolute dorsally, more or less involute ventrally and umbilicate. Early chambers subglobular, later becoming increasingly elongate in a radial direction. Wall generally hispid, uniformly perforate. lacking imperforate peripheral bands, carinae or costellae. Aperture ventral, interiomarginal, umbilical-extraumbilical, sometimes reaching periphery of the preceding whorl but not extending on to the dorsal surface or becoming equatorial. Test not biumbilicate. Apertures furnished with portici, but lacking tegilla or bullae. No supplementary or accessory apertures. but relict apertures may be present. Size: Etymology: Extra details from original publication Remarks. This subgenus differs from Praeglobotruncana (Praeglobotruncana) in lacking a an imperforate peripheral band and in possessing radially elongate chambers in the adult . It differs from P. (Hedbergella) in possessing radially elongate adult chambers, and is related to that subgenus in the same way as Globorotalia (Hastigerinella) is related to G. (Turborotalia). lt differs from G. (Hastigerinella) in possessing characteristically Hantkeninid portici, and it may be distinguished from Planomalina (Hastigerinoides) by its lack of an equatorial primary aperture and its uniumbilicate test.
Hastigerinella simplex Morrow 1934, and Hastigerinoides simplicissima Magné and Sigal 1954, are also considered to belong to Praeglobotruncana (Clavihedbergella). Editors' Notes
Banner, F. T. & Blow, W. H. (1959). The classification and stratigraphical distribution of the Globigerinaceae. Palaeontology. 2(1): 1-27. gsVO
Praeglobotruncana (Clavihedbergella) compiled by the pforams@mikrotax project teamviewed: 7-12-2022