Eohastigerinella watersi

Taxonomy

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

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:

• Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
• Triangles indicate an event for which a precise placement has been suggested
• Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
• Taxon plotted: Eohastigerinella watersi, synonyms included - Eohastigerinella alpina; Eohastigerinella watersi; Hastigerinoides alpina; Hastigerinoides watersi;
• See also space-time plot :: Samples map :: Parent: Eohastigerinella

Eohastigerinella watersi compiled by the pforams@mikrotax project team viewed: 13-12-2024 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110100 Go to Archive.is to create a permanent copy of this page - citation notes

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