nmn

Clavihedbergella subcretacea


Classification: pf_mesozoic -> Hedbergellidae -> Clavihedbergella -> Clavihedbergella subcretacea
Sister taxa: C. amabilis, C. eocretacea, C. leckiei, C. moremani, C. moulladei, C. pauliani, C. simplex, C. simplicissima, C. subcretacea, C. subdigitata, C. sp.,

Taxonomy

Citation: Clavihedbergella subcretacea (Tappan, 1943)
Rank: Species
Basionym: Hastigerinella subcretacea
Taxonomic discussion: This species differs from B. eocenica Nuttall in the smaller size, narrower and more numerous chambers, and the more trochoid appearance. It is similar in the comparatively short chambers, for this genus, and in the even size throughout.
Hastigerinella subcretacea is a very primitive species of the genus, and shows many of the characters of Globigerina and Globigerinella, suggesting the possible origin of the genus Hastigerinella.
The genus Hastigerinella was formerly known only from the Upper Cretaceous to the Recent, and the generic range is here extended downward into the Lower Cretaceous. [copied from Chronos database]

Type images:

Original description: Test small, slightly trochoid, flattened, periphery broadly rounded; chambers numerous, increasing rapidly in size, six to seven in The last-formed volution, the later chambers much inflated and radially elongated; sutures distinctly depressed; wall calcareous, surface very finely perforate; aperture an arch at the base of the last-formed chamber and slightly ventrally placed on the periphery.

Entries in the Catalog of original descriptions: Hastigerinella subcretacea

Geological Range:
Last occurrence (top): within P. appenninica zone (100.50-101.92Ma, top in Albian stage). Data source: [copied from Chronos database]
First occurrence (base): within P. ticinensis zone (101.92-103.94Ma, base in Albian stage). Data source: [copied from Chronos database]

Plot of occurrence data:

Dec 2017 - Plotting of Neptune data has been re-enabled on the Mesozoic pages following revision of the age-models in Neptune. The data is, however, still very sparse for the Early Cretaceous

  • Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
  • Note to users in China - the diagram may not plot unless you use a VPN since I use google services on the website. If this is a problem please contact me 谢谢.
  • Taxon plotted: Clavihedbergella subcretacea, synonyms included - Clavihedbergella subcretacea; Hedbergella amabilis;
  • space-time plot :: Samples map :: Parent: Clavihedbergella

    Character matrix

    test outline:Stellatechamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical-extraumbilical
    sp chamber shape:Elongatecoiling axis:Very lowperiphery:N/Aaperture border:Thin lip
    umb chbr shape:Elongateumbilicus:Wideperiph margin shape:Moderately roundedaccessory apertures:Relict
    spiral sutures:Strongly depressedumb depth:Shallowwall texture:Smoothshell porosity:
    umbilical or test sutures:Strongly depressedfinal-whorl chambers:5.5-7.0 N.B. These characters are used for advanced search. N/A - not applicable

    References:

    Leckie, M. (1984). Mid-Cretaceous planktonic foraminiferal biostratigraphy off Central Morocco, Deep Sea Drilling Project Leg 79, Sites 545 and 547. Initial Reports of the Deep Sea Drilling Project. 79: 579-620. gs

    Tappan, H. (1943). Foraminifera from the Duck Creek formation of Oklahoma and Texas. Journal of Paleontology. 17(5): 467-517. gs


    logo

    Clavihedbergella subcretacea compiled by the pforams@mikrotax project team viewed: 22-10-2019

    Taxon Search:
    Advanced Search

    Short stable page link: http://mikrotax.org/pforams/index.php?id=110050 Go to Archive.is to create a permanent copy of this page - citation notes



    Comments (0)

    No comments yet. Be the first!

    Add Comment

    * Required information
    1000
    Captcha Image
    Powered by Commentics