pforams@mikrotax - Eohastigerinella watersi pforams@mikrotax - Eohastigerinella watersi

Eohastigerinella watersi

Classification: pf_mesozoic -> Globigerinelloididae -> Eohastigerinella -> Eohastigerinella watersi
Sister taxa: E. watersi, E. sp.


Citation: Eohastigerinella watersi (Cushman, 1931)
taxonomic rank: Species
Basionym: Hastigerinella watersi

Type images:

Original description: Test slightly trochoid, the spire very much compressed so that all the chambers appear to be nearly in one plane; earliest chambers subglobular and very small compared to the later ones, the spire which they form being in a depressed area of the dorsal side, later chambers gradually increasing in size, and is the adult whorl becoming more and more elongate, the final chambers being about 5 times as long as broad, the base widest, thence gradually and slightly tapering toward the outer end, which is again expanded to form a slightly bulbous tip; sutures distinct, depressed; wall finely spinose throughout, the outer end of each chamber slightly coarser, and possibly forming the base of elongate spines; aperture on the vestral side, and extending toward the periphery, with a slight overhanging lip.

Entries in the Catalog of original descriptions: Hastigerinella watersi, Hastigerinoides alpina

Character matrix
test outline:Stellatechamber arrangement:Planispiraledge view:Hourglassaperture:Equatorial
sp chamber shape:Elongatecoiling axis:Very lowperiphery:N/Aaperture border:Thin lip
umb chbr shape:Elongateumbilicus:Wideperiph margin shape:N/Aaccessory apertures:Relict
spiral sutures:Moderately depressedumb depth:Shallowwall texture:Finely pustuloseshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:4.5-5.5 N.B. These characters are used for advanced search. N/A - not applicable

Geological Range:
Last occurrence (top): within D. asymetrica zone (83.65-85.60Ma, top in Santonian stage). Data source: [copied from Chronos database]
First occurrence (base): within D. asymetrica zone (83.65-85.60Ma, base in Santonian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:


Cushman, J. A. (1931a). Hastigerinella and other interesting foraminifera from the Upper Cretaceous of Texas. Contributions from the Cushman Laboratory for Foraminiferal Research. 7(4): 17-19. gs

Masters, B. A. (1977a). Mesozoic planktonic foraminifera. In, Ramsay, A. T. S. (ed.) Oceanic Micropaleontology. Academic Press, London 1: 301-731. gs

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


Eohastigerinella watersi compiled by the pforams@mikrotax project team viewed: 25-6-2024

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