CATALOG OF ORIGINAL DESCRIPTIONS: Ascoliella scotiensis Banner and Desai 1988

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.


Higher levels: pf_cat -> A -> Ascoliella -> Ascoliella scotiensis
Other pages this level: A. scotiensis,

Ascoliella scotiensis

Citation: Ascoliella scotiensis Banner and Desai 1988
Rank: Species
Type locality: Oneida Well 0-25, side wall core at 7,605 feet
Type age: Aptian
Holotype Repository: Geological Survey of Canada
Type & figured specimens: Ascol 1976 pl.1 figs 4a-c, Baner & Desai 1988 PI. 2, figs. 3-4.; GSC numbers 53770, 53771, 53772

Current identification/main database link: Favusella washitensis (Carsey, 1926)


Original Description
Diagnosis of the species: Ascoliella with 6 to 7 chambers in the last whorl, the chambers subglobular in axial view and reniform in spiral view: intercameral sutures weakly depressed and subradial.

Generic diagnosis Test trochospiral, composed of two or more whorls of subglobular or reniform chambers, initially with about five chambers per whorl, final whorl of about six chambers; spiral side completely evolute, umbilical side almost completely involute, with a small, deep umbilicus; aperture a low interiomarginal arch, intraumbilical - extraumbilical in extent; wall microperforate, the surface covered by anastomosing ridges which enclose groups of microperforations in a favose reticulation.

Etymology: The specific name indicates its provenance in the subsurface of the Scotian Shelf.

Extra details from original publication
Synonym: Favusella aff. washitensis (Carsey), Ascoli, 1976, p. 661, 674, pl. 1, figs. 4a-c.

Remarks. This species was recognised by Ascoli (1976) to characterise an Aptian biozone in wells drilled on the Scotian shelf and south-west Grand Banks off Nova Scotia. It has not yet been recorded elsewhere and it may have been restricted to the western boundary current of the Early Cretaceous primitive Atlantic Ocean. Its stratigraphic position, together with the characters of its reticulation, suggests that it evolved directly from Favusella tardita, or F. tardita quadricamerata, and that it became extinct at or before the evolutionary appearance of Albian species of Ascoliella. Ascoliella scotiensis, the earliest known species of Ascoliella, differs from A. nitida (Michael) in possessing a coarser reticulum with concave depressions rather than flat-floored inter-ridge spaces, and from A. pessagnoi (Michael) in having more depressed and reniform chambers with less depressed sutures. A. quadrata (Michael) has fewer, much more globular and rapidly enlarging chambers than in A. scotiensis.

References:

Ascoli, P. (1976). Foraminiferal and ostracod biostratigraphy of the Mesozoic-Cenozoic, Scotian shelf, Atlantic Canada. I , 653-771. Maritime Sediments, Spec. Publ.. 1: 653-771. gs

Banner, F. T. & Desai, D. (1988). A review and revision of the Jurassic-Early Cretaceous Globigerinina,with especial reference to the Aptian assemblages of Speeton (North Yorkshire, England). Journal of Micropalaeontology. 7: 143-185. gs


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Ascoliella scotiensis compiled by the pforams@mikrotax project team viewed: 7-12-2019

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