Citation: Archaeoguembelitria Georgescu 2009Rank: GenusType species: Guembelitria harrisi Tappan, 1940, p. 115, pl. 19, fig. 2.Type age (chronostrat): Upper Albian to lowermost Turonian (from the P. ticinensis Biozone throughout the lower part of the W. archaeocretacea Biozone).Type locality: Cosmopolitan.
Diagnosis.– Test triserial with chamber surface exhibiting the transition from completely smooth to pore mounds.
Description.– Test triserial throughout, twisted or not. Chambers are globular and increase gradually in size as added. Sutures are distinct and depressed. Aperture is umbilical in position, large, a high arch situated at the base of the last formed chamber. A thin and delicate lip borders the aperture. Chamber surface is smooth in the earlier species and with pore mounds in the evolved ones. Test wall is calcitic, hyaline, microperforate.
Size: Etymology: The prefix “archaeo-“ (ancient, old) is added to the pre-existent genus name Guembelitria. Extra details from original publication Remarks.– Archaeoguembelitria is proposed for a lineage of upper Albian to lowermost Turonian age, which consists of triserial foraminifera and were previously included within Guembelitria (Fig. 2). The test surface shows grad- ual transition between the earlier, smooth A. cenomana (Keller, 1935) and the evolved species, which bears pore mounds on the test surface, namely A. harrisi (Tappan, 1940). This sequence in the development of test ornamentation from smooth to pore mounds is relatively similar to the late Santonian-earliest Paleocene Guembelitria, namely G. sp. (smooth surface)-G. turrita (pustulose)-G. cretacea (pore mounds). Editors' Notes Georgescu (2009a) described two new species of this new genus, one benthic (Archaeoguembelitria cenomana), and one planktonic (Archaeoguembelitria harrisi)
Georgescu, M. D. (2009a). On the origins of Superfamily Heterohelicacea Cushman, 1927 and the polyphyletic nature of planktic foraminifera. Revista Española de Micropaleontología. 41: 107-144. gsVO
Archaeoguembelitria compiled by the pforams@mikrotax project teamviewed: 6-2-2023