Specimens which cannot be assigned to established species
| Daughter taxa (time control age-window is: 0-800Ma) | ||||
| Conoglobigerina caucasica | |||
| | | Conoglobigerina grigelisi | |
| Conoglobigerina gulekhensis | |||
| | | Conoglobigerina helvetojurassica | |
| Conoglobigerina sp. Specimens which cannot be assigned to established species | ||||
Taxonomy
Original description: Translation from the Russian - Test with a high spiral, height usually equal to or greater than the diameter (H:D > 1:1). The spiral is formed by three or four whorls less frequently by 2 or 2½ whorls. Chambers subspherical, more or less losely aranged. The number of chambers is inconstant, and varies from three to six per whorl. Fre:quently, there there are specimens with a multichambered initial whorl consisting of 5 or 6 chambers, the subsequent wholrs comprising 3 or 4 chambers each; however some forms have an equal numbers of chambers in all whorls. in some representatives of the subgenus the chambers are arranged so as to form more or less regular rows; in others, no regular pattern in the arrangement of chambers is noticeable. Aperture small, single. Wall thin, finely porous, surface smooth or slightly rugose. Family Globigerinidae. Middle Jurassic-Recent(?).
Entries in the Catalog of original descriptions: Conoglobigerina
Distinguishing features:
Parent taxon (Conoglobigerinidae): Small (<200µm), microperforate wall, 3-4 globose chambers in final wall, aperture umbilical
This taxon: Chambers of the last whorl strongly embrace previous whorls; irregularly reticulate wall surface pattern
Test trochospiral, low to medium high spired (H/D ratio 0.5–1, rarely over 1); final whorl may be compact or more open in shape. Chamber shape globular, rounded, rarely slightly irregular with 3.5–4 chambers in last whorl. Chambers of the last whorl strongly embrace previous whorls. Apertural shape variable, low arch or slit; mostly umbilical, but may be slightly extraumbilical in position. Wall microperforate, with small or larger, blunt pustules; pustules fuse to form ridges that are organized in broken cells that form an imperfect reticulate pattern. [Gradstein et al 2017]
Morphology:
Character matrix
| test outline: | Lobate | chamber arrangement: | Trochospiral | edge view: | Spiroconvex | aperture: | Umbilical |
| sp chamber shape: | Globular | coiling axis: | Low-moderate | periphery: | N/A | aperture border: | |
| umb chbr shape: | Globular | umbilicus: | periph margin shape: | Broadly rounded | accessory apertures: | None | |
| spiral sutures: | Moderately depressed | umb depth: | wall texture: | Finely pustulose | shell porosity: | Microperforate: <1µm | |
| umbilical or test sutures: | Moderately depressed | final-whorl chambers: | 0-0 | N.B. These characters are used for advanced search. N/A - not applicable | |||
Most likely ancestor: Globuligerina - at confidence level 2 (out of 5). Data source: Gradstein et al. (2017) p. 263.
Geological Range:
Last occurrence (top): at top of Valanginian Stage (100% up, 132.6Ma, in Hauterivian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within Middle Oxfordian Substage (156.60-159.40Ma, base in Oxfordian stage). Data source: Total of ranges of species in this database
Plot of range and occurrence data:
Gradstein, F. M., Gale, A. S., Kopaevich, L., Waskowska, A., Grigelis, A. & Glinskikh, L. (2017b). The planktonic foraminifera of the Jurassic. Part I: material and taxonomy. Swiss Journal of Palaeontology. 136(2): 187-257. gs O Loeblich, A. R. & Tappan, H. (1988). Foraminiferal Genera and Their Classification (Volume I-II). Van Nostrand Reinhold Co., New York. 1-1059. gs Morozova, V. G. & Moskalenko, T. A. (1961). Планктонные фораминиферы пограничных отложений байосского и батского ярусов Центрального Дагестана (Северо-Восточный Кавказ) [Foraminiferes planctoniques des depots limitrophes du Bajocien et du Bathonien du Daghestan central (Nord-Est du Caucase)]. Voprosyi Mikropaleontologii. 5: 3-30. gs Simmons, M. D., Boudagher-Fadel, M. K., Banner, F. T. & Whittaker, J. E. (1997). The Jurassic Favusellacea, the earliest Globigerina. In, Boudagher-Fadel, M. K., Banner, F. T. & Whittaker, J. E. (eds) The Early Evolutionary History of Planktonic Foraminifera. British Micropalaeontological Society Publication Series . 17-30. gs References:
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Conoglobigerina compiled by the pforams@mikrotax project team viewed: 11-10-2024
Short stable page link: https://mikrotax.org/pforams/index.php?id=110055 Go to Archive.is to create a permanent copy of this page - citation notes |
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