CATALOG OF ORIGINAL DESCRIPTIONS: Blefuscuiana whittakeri Banner, Copestake & White, 1993

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 -> B -> Blefuscuiana -> Blefuscuiana whittakeri
Other pages this level: B. albiana, B. aptiana depressa, B. aptiana implana, B. aptiana orientalis, B. daminiae, B. excelsa cumulus, B. globigerinelloides lobulata, B. hexacamerata, B. kuznetsovae, B. laculata, B. laculata alobata, B. laculata laculata, B. mitra, B. multicamerata, B. occulta perforocculta, B. occulta quinquecamerata, B. praesimilis, B. rudis, B. speetonensis, B. speetonensis tunisiensis, B. whittakeri,

Blefuscuiana whittakeri

Citation: Blefuscuiana whittakeri Banner, Copestake & White, 1993
Rank: Species
Type locality: Holotype. P52717 (PI. 5, figs. 3a-c, 4), from North Sea Well 15/30-3, 12830-12840 ft, Early Aptian. Paratypes. P52718, from same sample as holotype; P52719 and P52720, from North Sea Well 20/2- 2, 8250 ft and 8300 frespectively, both Early Aptian; P52721, P52722 and P52723, all from North Sea Well 16/28-6RE, 4250 m, 4225 m and 4275 m respectively, all Early Barremian.
Type level: Lower Cretaceous, lower Aptian, uppermost Valhall Formation
Holotype Repository: London, UK; NHM
Holotype number: P52717

Current identification/main database link:


Original Description:
DIAGNOSIS. Characterised by high, rapidly enlarging cham- bers, about 5 in each of the later whorls, forming a robust test with virtually radial and straight intercameral sutures, a flattened dorsal side and a very smal umbilicus.
DESCRIPTION. Test about 0.10mm to 0.25mm in maximum diameter; about three whorls of inflated, subglobular chambers, forming a test which is slightly convex or flattened dorsally, and convex ventrally with a small but deep umbilicus. The chambers enlarge rapidly, so that the last whorl increases the diameter of the test by more than 50% (i.e. from about 60% of the final diameter to 100%); the chambers are symmetrical (highest in their mid-parts) and are high when seen dorsally, becoming as high as long. The dorsal and ventral intercameral sutures are virtually straight and radial, and the terminal face is high, radial     and flattened. The intercameral sutures are moderately depressed and make depressions of about 150° at the equatorial periphery. The aperture is a low slit. The surface of the typical form of the species is covered by low perforation cones

Size: Test about 0.10mm to 0.25mm in maximum diameter

Extra details from original publication:
NAME. For J.E. Whittaker, The Natural History Museum, London, for his help in preparing the environmental chamber SEM photornicrographs of B. infracretacea (Giaessner) and for his enthusiastic support in this project.
REMARKS. This species most clearly differs from Blejuscuiana rudis Banner, Copestake and White, 1993, by its undepressed chambers which more rapidly enlarge and consequently increase the diameter of the test more rapidly, and by its narrower umbilicus; also, its dorsal intercameral sutures are straighter, more radial, and the dorsal surface of the test is flatter than in B. rudis. A form of this species which lacks perforation cones has not yet been recognized.
DISTRIBUTION. Central North Sea (Wells).
STRATIGRAPHY. Early Barremian-Late Aptian.

References:

Banner, F.T.; Copestake, P. & White, M.R., (1993). Barremian-Aptian Praehedbergellidae of the North Sea area: a reconnaisance. Bulletin of the Natural History Museum, London (Geology), 49: 1-30.


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Blefuscuiana whittakeri compiled by the pforams@mikrotax project team viewed: 26-9-2017

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