pforams@mikrotax - Favusella washitensis <title>pforams@mikrotax - Favusella washitensis

Favusella washitensis

Classification: pf_mesozoic -> Favusellidae -> Favusella -> Favusella washitensis
Sister taxa: F. hoterivica, F. washitensis, F. sp.


Citation: Favusella washitensis (Carsey, 1926)
Rank: Species
Basionym: Globigerina washitensis Carsey, 1926
Taxonomic discussion: Favusella washitensis is regarded as a species comprising several morphotypes of common origin. The different morphotypes represent different polymorphic stages in the life cycle and ecophenotypes of a single taxon.
Specimens attributed to Favusella are distinguised from Hedbergella by having a distinctly trochoid chamber shape, thicker and distinctly ornamented wall, characteristic pore distribution pattern, and umbilical position of the aperture. [copied from Chronos database]

Type images:

Original description: Shell calcareous, usually white; surface very coarsely and regularly pitted; chambers well inflated, rapidly enlarging, arranged subspirally, dorsal side shows two or more whorls; ventral side shows only one whorl which consists of the last three or four chambers rather loosely joined about a depressed center; aperture at the inner margin of the final chamber. 

Entries in the Catalog of original descriptions: Globigerina washitensis, Favusella confusa, Favusella hedbergellaeformis, Hedbergella hiltermanni, Favusella nitida, Favusella orbiculata, Favusella papagayosensis, Favusella pessagnoi, Favusella planata, Favusella quadrata, Favusella scitula, Ascoliella scotiensis, Favusella stiftia, Favusella voloshinae, Favusella wenoensis

Emended description:

Emended (E.A.M. Koutsoukos, 2005): Test a low to relatively high trochospiral coil, equatorial periphery lobate, peripheral edge rounded. Chambers spherical to subspherical; 1.5 to 3.5 whorls each with 3 to 6 chambers, usually 4 to 5 in last whorl. Last chamber in mature individuals is usually smaller (embryonic), bare or with smooth ornamentation, extending over the umbilicus and partially covering it. Primary aperture usually arcuate, low to moderate, interiomarginal, umbilical to umbilical-extraumbilical in position, bordered by wide or narrow lip. Umbilicus shallow, of variable width. Sutures radial to slightly curved, depressed. Test surface covered by variable sculptural ornamentation, progressively developing from fine rounded tubercles and well-defined rounded or elongated tubercles (some forming elongated quadrangles = ridges), to reticulate system of fine to coarse ridges forming irregular polygonal cells (honeycomb pattern) in ephebic (adult) stage. Numerous minute pores located nearly exclusively within polygonal cells and between tubercles; pores scattered on edges of cell-ridges and tubercles. Size (maximum diameter) <0.1-0.25mm in the neanic stage (1 to 2 whorls), 0.25-0.35mm in ephebic forms (2.5 to 3 whorls) and 0.35->0.5mm in gerontic specimens (3 to 3.5 whorls). [copied from Chronos database]


Wall type:


Character matrix
test outline:Lobatechamber arrangement:Trochospiraledge view:Spiroconvexaperture:Umbilical
sp chamber shape:Inflatedcoiling axis:Moderate-highperiphery:N/Aaperture border:Thin lip
umb chbr shape:Inflatedumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Moderately depressedumb depth:Shallowwall texture:-shell porosity:Microperforate: <1µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:4.0-6.0 N.B. These characters are used for advanced search. N/A - not applicable

Geological Range:
Last occurrence (top): within T. globotruncanoides zone (96.08-100.50Ma, top in Cenomanian stage). Data source: [copied from Chronos database]
First occurrence (base): within T. bejaouaensis zone (113.26-118.02Ma, base in Aptian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:


Carsey, D. O. (1926). Foraminifera of the Cretaceous of central Texas. University of Texas Bulletin. 2612: 1-56. gs

Pessagno, E. A. (1967). Upper Cretaceous planktonic foraminifera from the western Gulf Coastal Plain. Palaeontographica Americana. 5: 245-445. gs V O

Postuma, J. A. (1971). Manual of planktonic foraminifera. Elsevier for Shell Group, The Hague. 1-406. gs


Favusella washitensis compiled by the pforams@mikrotax project team viewed: 30-1-2023

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AphiaID: 1035309 Nomenclatural data on WoRMS
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