Original Description Test highly trochospiral; chamber form variable, mostly polygonal in outline; single-keeled throughout; keel present on all chambers (except the earliest ones), distally dichotomic with dorsoseptal and ventro-septal as well as periumbilical extensions; spine-shaped extensions of the chambers present in some forms; cameral aperture umbilical, single; labial aperture pointing strongly backwards, in reflexed position opening into the umbilical cavity or suprasuturally towards the periphery; lips much longer on the distal side than on the proximal one, extremely highly arched, much narrower at the junction with the corresponding chamber and trumpet-shaped, overriding each other or fusing the strongly recurving distal ends and forming an umbilical cover-plate covering entirely the umbilical cavity with labial apertures opening towards the periphery; umbilicus large, partly or entirely covered by the apertural lips. Size: Etymology: Extra details from original publication Remarks. Globotruncanita, gen. nov., resembles somewhat Truncorotalia Cushman and Bermudez, but differs from the latter in many respects. There is apparently no connection between these genera (Truncorotalia appears in the Paleocene) and they have been often confused. It has been emphasized by various authors that the stuarti- group is very distinct from other "Globotruncanas," as far as chamber-form, keels and apertural characters are concerned (see among others Reichel, 1949, Gandolfi, 1955a). To Globotruncanita belong many species, e. g. G. elevata (Brotzen), G. stuartiformis (Dalbiez), G. calcarata (Cushman), G. conica (White), etc. The single-keeled Globotruncana helvetica Bolli, which resembles Globotruncanita, shows, however, distinctive features and is included in a new genus, Helvetoglobotruncana.
Late Santonian to Maestrichtian. Editors' Notes
Gandolfi, R. (1955). The genus Globotruncana in northeastern Colombia. Bulletins of American Paleontology. 36: 1-118. gs
Reichel, M. (1949b). Observations sur les Globotruncana du gisement de la Breggia (Tessin). Compte Rendu de la Societe Paleontologique Suisse. 42(2): 596-617. gs
Reiss, Z. (1957b). The Bilamellidea, nov. superfam., and remarks on Cretaceous globorotaliids. Contributions from the Cushman Foundation for Foraminiferal Research. 8(4): 127-145. gsVO
Globotruncanita compiled by the pforams@mikrotax project teamviewed: 4-2-2023