Citation: Conoglobigerinidae Simmons et al. 1997Taxonomic rank: family
Original description: Those genera of the Favusellacea which do not possess a favose surface structure of fused pseudomuricae forming an anastomosing reticulation.
Distinguishing features: Parent taxon (pf_mesozoic): This taxon: Small (<200µm), microperforate wall, 3-4 globose chambers in final wall, aperture umbilical
Morphology: The oldest known foraminifera which may confidently be considered to have been planktonic were species of Conoglobigerina (C. avariformis Kasimova, C. balakhmatovae (Morozova), C. dagestanica Morozova and, possibly, C. avarica Morozova). These appeared in the Bajocian (Figure 2.2) and are known only from eastern Europe (central and northern Tethys). We consider them to belong to the Favusellacea, the aragonitic, microperforate, stage of life adopted by the gamonts of some pseudomuricate superfamily, with an umbilical aperture, and all the adult chambers of all of these species are subglobular in shape. They appear to show a marked dimorphism, however, which is a feature not known in true (holo-)planktonic forarninifera. [Simmons et al. 1997, p. 18]
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
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 Bajocian Stage (168.17-170.90Ma, base in Bajocian stage). Data source: Total of ranges of species in this database
Plot of range and occurrence data:
Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
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
Conoglobigerinidae compiled by the pforams@mikrotax project teamviewed: 9-11-2025
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