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Eohastigerinella watersi


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

Taxonomy

Citation: Eohastigerinella watersi (Cushman, 1931)
Rank: Species
Basionym: Hastigerinella watersi
Synonyms: Hastigerinoides alpina

Type images:

Original description: Hastigerinella watersi Cushman 1931: 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;

Geological Range:
Last occurrence (top): within D. asymetrica zone (84.19-86.71Ma, top in Santonian stage). Data source: [copied from Chronos database]
First occurrence (base): within D. asymetrica zone (84.19-86.71Ma, base in Coniacian stage). Data source: [copied from Chronos database]

Plot of occurrence data:

NB Plotting of Neptune data has been disabled on the Mesozoic pages because the dataset is both small and badly affected by a few sites with erroneous age models (our obs Huber, Petrizzo, Young, Nov 2016). The data can still be viewed via the range plottertool - tools menu.

Character matrix

test outline:Stellatecoiling axis:Very lowchamber arrangement:Planispiralumbilicus:Wide
edge view:Hourglassumbilical or test sutures:Moderately depressedspiral sutures:Moderately depressedshell porosity:Finely Perforate: 1-2.5
wall texture:Finely pustuloseaperture:Equatorialaperture border:Thin lipaccessory apertures:Relict
periphery:N/Aumb chamber shape:Elongatesp chbr shape:Elongateperiph margin shape:N/A
umb depth:Shallowdiameter mm:0.8width mm:breadth mm:0.1
final-whorl chambers:4.5-5.5

References:

Cushman, J.A., (1931). A preliminary report on the foraminifera of Tennessee. Tennessee Division of Geology Bulletin, 41: 1-116.

Cushman, J.A., (1931). The foraminifera of the Atlantic Ocean. Part 8. Rotaliidae, Amphisteginidae, Calcarinidae, Cymbaloporettidae, Globorotaliidae, Anomalinidae, Planorbulinidae, Rupertiidae and Homotremidae. Smithsonian Institution United States National Museum Bulletin, 104(8): 1-179.

Cushman, J.A., (1931). The foraminifera of the Saratoga chalk. Journal of Paleontology, 5(4): 297-315.


Eohastigerinella watersi compiled by the pforams@mikrotax project team viewed: 29-5-2017

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