Specimens which cannot be assigned to established species
| Daughter taxa (time control age-window is: 0-800Ma) | ||||
| | | Favusella hoterivica | |
| | | Favusella washitensis | |
| Favusella sp. Specimens which cannot be assigned to established species | ||||
Taxonomy
Original description: Test calcareous, microgranular hyaline, finely perforate with spherical to ovate chambers arranged in a low to moderately trochospiral coil; periphery rounded, lacking keel or imperforate periph cral band. Sutures depressed, radial, straight to slightly curved; umbilicus narrow to exceedingly wide. Primary aperture interiomarginal, umbilical to spiroumbilical with all possible intermediate positions; bordered above by a narrow lip in well preserved specimens. Test coarsely reticulated into regular polygonal areas by ridges forming a honey-comb pattern; each polygonal area with twenty or more minute pores.
Entries in the Catalog of original descriptions: Favusella
Distinguishing features:
Parent taxon (Favusellidae): Test trochospirally coiled, chambers inflated, rounded to ovate; wall cancellate, with abundantly perforated fields bordered by imperforate ridges; primary aperture umbilical to slightly extraumbilical, with an imperforate lip; umbilicus narrow to wide and deep, margin noncarinate.
This taxon: Test trochospirally coiled, globular chambers rapidly enlarging, four to five in each of the two to three whorls, sutures radial, depressed, umbilicus narrow to wide, periphery broadly rounded, peripheral outline lobulate; wall calcareous, hyaline, optically radial, perforate, without keel or poreless carinal band, surface with a distinct honeycomblike pattern of costellae, few to many tiny pores in each of the rectangular to hexagonal areas, and rare pores on the elevated reticulum; aperture an interiomarginai arch of varied extent, ranging from umbilical to spiroumbilical and bordered by a narrow lip.
Geological Range:
Last occurrence (top): in upper part of Cenomanian Stage (67% up, 96.1Ma, in Cenomanian stage). Data source: Total of range of species in this database
First occurrence (base): in upper part of Berriasian Stage (55% up, 141.9Ma, in Berriasian stage). Data source: Total of range of species in this database
Plot of range and occurrence data:
Loeblich, A. R. & Tappan, H. (1988). Foraminiferal Genera and Their Classification (Volume I-II). Van Nostrand Reinhold Co., New York. 1-1059. gsReferences:
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Favusella compiled by the pforams@mikrotax project team viewed: 10-6-2023
Short stables page link: https://mikrotax.org/pforams/index.php?id=110106 Go to Archive.is to create a permanent copy of this page - citation notes |
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