pforams@mikrotax - Favusellidae pforams@mikrotax - Favusellidae

Favusellidae


Classification: pf_mesozoic -> Favusellidae
Sister taxa: Guembelitriidae ⟩⟨ Heterohelicidae ⟩⟨ Planomalinidae, Globigerinelloididae, Schackoinidae ⟩⟨ Conoglobigerinidae, Chilostomellidae, Favusellidae, Praehedbergellidae, Hedbergellidae, Rugoglobigerinidae, Rotaliporidae, Globotruncanidae, hidden
Daughter taxa (time control age-window is: 0-800Ma)Granddaughter taxa
Favusella
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.
Favusella hoterivica
Favusella washitensis
Favusella sp.

Taxonomy

Citation: Favusellidae Longoria, 1974
taxonomic rank: Family

Entries in the Catalog of original descriptions: Favuselloidea

Distinguishing features:
Parent taxon (pf_mesozoic):
This taxon: 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.

Geological Range:
Last occurrence (top): at top of T. globotruncanoides zone (100% up, 96.1Ma, in Cenomanian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within G. hoterivica zone (134.74-141.93Ma, base in Berriasian stage). Data source: Total of ranges of species in this database

Plot of range and occurrence data:

References:

Loeblich, A. R. & Tappan, H. (1988). Foraminiferal Genera and Their Classification (Volume I-II). Van Nostrand Reinhold Co., New York. 1-1059. gs

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Favusellidae compiled by the pforams@mikrotax project team viewed: 11-12-2023

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Comments (2)

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André

Hello,

In the favusellidae, the range chart indicates occurences of Favusella in the R. cushmani zone... while the last occurence of F. washitensis is in T. globotruncanoides zone. Does it means you know/suggest some Favusella sp. in the R.c. zone or is it just the line going too far ?

Thanks for this web page... a great tool !

Best

André

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Jeremy Young(UK)

Hi André

Apologies for a delayed reply. The simple answer here is that the ranges of genera (and higher taxa) are rounded to the nearest stage on these diagrams. In general this is a good convention, since it avoids the appearance of spurious precision, but inevitably it sometimes creates slight anomalies.

Jeremy