CATALOG OF ORIGINAL DESCRIPTIONS: Blefuscuiana rudis 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 rudis
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 rudis

Citation: Blefuscuiana rudis Banner, Copestake & White, 1993
Rank: Species
Type locality: Holotype. P52713 (PI. 5, figs. la-c), from Central North Sea Well16/28-6RE, 4275 m (Early Barremian). Paratypes. P52714 (PI. 5, figs. Sa-c), from same sample as holotype; P52715 (PI. 5, figs. 2a-c), Central North Sea Well 20/2- 2, 8250 ft (Early Aptian); P52716, Central North Sea Welll5/30-3, 12830-12840 ft (Early Aptian).
Type level: Lowermost Cretaceous, lower Barremian, upper Valhall Formation.
Holotype Repository: London, UK; NHM
Holotype number: P52713-6

Current identification/main database link:


Original Description

DIAGNOSIS. A bulky test with marked dorsal convexity and weakly depressed sutures, early chambers which are subglobular, but with predominantly depressed chambers in the last whorl (about half as high as long when viewed dorsally), and with perforation cones
DESCRIPTION Test about 0.15-0.30mm at its maximum diameter, comprising about 3 whorls. There are 5-6 (commonly 6) chambers in each ofthe penultimate and last whorls. The spiral side is strongly convex. The intercameral sutures are weakly depressed and form intercameral angles of 150° or more at the periphery of the test. The chambers are symmetrical and increase in size gradually with growth; they are predominantly depressed in the final whorl, commonly being about half as high as long (when viewed on the dorsal side), but the penultimate chamber may be only slightly depressed (about 2/3 as high as long when viewed dorsally), while the last chamber may be subglobular. The umbilicus is small and deep and the aperture appears to be a narrow slit. Perforation cones are present on all chambers of the last whorl.

Etymology: After rudis, rough, unpolished, referring to the test surface which possesses perforation cones.

Extra details from original publication
REMARKS. This species is distinctive because of its compact, almost plano-convex test, with low, depressed, symmetrical chambers, weakly depressed intercameral sutures, and a spire which appears to open only slowly when seen in dorsal view. The typical form has well developed perforation cones, but another subspecies, with a smooth surface, has not yet been found.
DISTRIBUTION. Central North Sea (wells).
STRATIGRAPHY. Early Barremian- Early 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 rudis compiled by the pforams@mikrotax project team viewed: 17-12-2017

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