nmn

Favusella hoterivica


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

Taxonomy

Citation: Favusella hoterivica (Subbotina, 1953)
Rank: Species
Basionym: Globigerina hoterivica
Taxonomic discussion: Contrary to the original description the test wall is cancellate and microperforate. Also, the aperture varies from a low arch to a higher arch or to loop shape. [F. Gradstein 2019 - based on examination of a large set of specimens from Berriasian-Valanginian strata, offshore eastern Canada, material first decribed by Wernli 1995]

Type images:

Original description: Test small, strongly convex, turret-shaped, consisting of 3 whorls; there are 4-5 highly inflated rounded chambers in the final whorl; these chambers are closely adjacent to one another so that the whole test looks like a disorganized accumulation of spherical chambers. The chambers grow very uniform in size. The sutures are short, slightly curved, almost straight. The umbilical aperture is a large slit in the extraumbilical area. The aperture has a small raised lip. Wall smooth, finely porous. Average dimensions: Diameter 0.15 mm; greatest thickness 0.10 mm.

Entries in the Catalog of original descriptions: Globigerina hoterivica


Wall type: cancellate and microperforate

Morphology: Coccioni and Premoli Silva (1994) reported 3, 3.5 or 4 chambers in the last whorl, overall test shape from almost rectangular to more triangular -quadrangular, and aperture low to higher arch. A bulla may be present. This description closely agrees with the variation in assemblages from Crimea, harbouring over 50 small specimens (Gradstein et al. 2018).

Close inspection of the axis of coiling in the Crimean specimens shows that it may change angle from the earlier to the last whorl, with the earlier 2-2.5 whorls being positioned almost sideways from the last whorl.
In this sense, F. hoterivica resembles the mode of coiling of Conoglobigerina gulekhensis (Gorbachik & Poroshina), which warrants more detailed study of these taxa from several localities to determine in more detail to what extent the test morphology of the two taxa overlaps. Among the Crimean specimens several show a looped aperture, as commonly found in Globuligerina oxfordiana (Grigelis). A bulla-like last chamber is common. Wall texture in the Crimean specimens is poorly preserved but reticulate (Gradstein et al., 2018).

Size: up to 250 micron

Most likely ancestor: Globuligerina oxfordiana - at confidence level 5 (out of 5). Data source: .

Geological Range:
Notes: Berriasian through ? Barremian; Favusella hoterivica is widely reported and easily recognized.
Last occurrence (top): within L. cabri zone (123.89-125.71Ma, top in Aptian stage). Data source: [copied from Chronos database]
First occurrence (base): at base of G. hoterivica zone (0% up, 141.9Ma, in Berriasian stage). Data source: zonal marker (from Timescale Creator)

Plot of range and occurrence data:

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Inequally biconvexaperture:Umbilical
sp chamber shape:Inflatedcoiling axis:Moderateperiphery:N/Aaperture border:Thick lip
umb chbr shape:Inflatedumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:N/A
spiral sutures:Moderately depressedumb depth:Deepwall texture:Cancellateshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:4.0-4.5 N.B. These characters are used for advanced search. N/A - not applicable

References:

Butt, A. (1979). Lower Cretaceous foraminiferal biostratigraphy, paleoecology, and depositional environment at DSDP Site 397, Leg 47A. Initial Reports of the Deep Sea Drilling Project. 47(1): 257-271. gs

Coccioni, R. & Premoli Silva, I. (1994). Planktonic foraminifera from the Lower Cretaceous of Rio Argos sections (southern Spain) and biostratigraphic implications. Cretaceous Research. 15: 645-687. gs

Gradstein, F., Waskowska, A., Kopaevich, L., Watkins, D., Friis, H. & Perez Panera, J. (2018). Berriasian planktonic foraminifera and calcareous nannofossils from Crimea Mountains, with reference to microfossil evolution. Swiss Journal of Geosciences. 1-24. gs V O

Lipson-Benitah, S. & Almogi-Labin, A. (2004). Aptian planktonic foraminifera from Israel. Israel Journal of Earth Sciences. 53(1): 27-46. gs

Subbotina, N. N. (1953). Foraminiferes fossiles d'URSS Globigerinidae, Globorotaliidae, Hantkeninidae. Bureau de Recherches Geologiques et Minieres. 2239: 1-144. gs

Wernli, R., Ascoli, P. & Williams, G. L. (1995). Favusella hoterivica (Subbotina) from the Berriasian and Valanginian of offshore Eastern Canada. Revue de Paléobiologie. 14(2): 379-398. gs


logo

Favusella hoterivica compiled by the pforams@mikrotax project team viewed: 15-4-2021

Taxon Search:
Advanced Search

Short stable page link: https://mikrotax.org/pforams/index.php?id=110107 Go to Archive.is to create a permanent copy of this page - citation notes



Comments (0)

No comments yet on this page. Please do add comments if you spot any problems, or have information to share

Add Comment

* Required information
1000
Captcha Image
Powered by Commentics