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Diagnosis. - The more diagnostic features of Caucasella are the Globigerina-like appearance and the umbilically placed primary aperture, bordered by an imperforate lip. Family Caucasellidae. Jurassic (Bathonian) to Cretaceous (Aptian). Definition. - Test coiled in a low to medium-high trochospire; periphery rounded to elongate with no indication of keel or imperforate band; chambers inflated, globular; sutures depressed, radial, straight to slightly curved; wall calcareous, finely perforate; radial in structure; surface smooth; primary aperture, interiomarginal, umbilical to slightly extraumbilical m position, bordered by an imperforate lip; umbilicus small, deep.
Extra details from original publication
Remarks. - Species of Caucasella Longoria such as Caucasella hauterivica (Subbotina) [Longoria's spelling = Globigerina hoterivica, 1953 ] have often been referred to Globigerina. Caucasella displays many characteristics of Globigerina. However, Caucasella is in no way related to Globigerina s.s. The Caucasellidae represent a group of primitive Globigerinacea of the Late Jurassic and Early Cretaceous. Primary differences between Caucasella and Globigerina are 1) the pore structure and 2) pore distribution. Whereas in Globigerina the pores are inset in the center of a polygonal frame: Caucasella has pores exposed flush with the test surface. In Caucasella pores are more sparsely distributed while Globigerina shows more pores per unit area.
Caucasella basically differs from Favusella Michael in lacking reticulated surface omamentation and by always showing an umbiljcal aperture.
Caucasella represents the most primitive stock of Globigerinacea. Its planktonic nature is demonstrated 1) by its globigeriniform test and 2) by its world-wide distribution.
Other species assignable to Caucasella are: Globigerina oxfordiana Grigelis, Globigerina? helvetojurassica Hauesler, Globigerina balakhmatovae Morozova and Globigerina kugleri Bolli.
Caucasella oxfordiana (Grigelis), originally described from the Upper Jurassic of Lithuanian U.S.S.R. (Grigelis, 1958), has also been reported from Majorca, Spain by Colom and Rangheard (1966, Rev. Micropal., vol. 9, no. 1, pp. 29-36) and from the Oxfordian of Havre, France (Bignot and Guyader, 1966, Rev. Micropal., vol. 9, no. 2, pp. 104-110).
Caucasella helvetojurassica (Hauesler) [Globigerina helveto-jurassica, 1881] was described from the Jurassic of Switzerland. More recently, Morozova described C. balakhmatovae from the lower Bathonian of Daghestan, U.S.S.R.
Grigelis, A. A. (1958). Globigerina oxfordiana sp. n. – an occurrence of Globigerina in the Upper Jurassic deposits of Lithuania. Nauchnyye Doklady Vysshey Shkoly, Geol-Geogr Nauki. 1958(3): 109-111. gs Longoria, J. F. (1974). Stratigraphic, morphologic and taxonomic studies of Aptian planktonic foraminifera. Revista Española de Micropaleontología. Numero Extraordinario: 5-107. gs
Grigelis, A. A. (1958). Globigerina oxfordiana sp. n. – an occurrence of Globigerina in the Upper Jurassic deposits of Lithuania. Nauchnyye Doklady Vysshey Shkoly, Geol-Geogr Nauki. 1958(3): 109-111. gs
Longoria, J. F. (1974). Stratigraphic, morphologic and taxonomic studies of Aptian planktonic foraminifera. Revista Española de Micropaleontología. Numero Extraordinario: 5-107. gs
Caucasella compiled by the pforams@mikrotax project team viewed: 20-2-2020
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