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 depressa, B. aptiana implana implana, B. aptiana orientalis, B. daminiae, B. excelsa cumulus, B. globigerinelloides lobulata, B. hexacamerata, B. kuznetsovae, B. laculata alobata alobata, B. laculata laculata, B. mitra, B. multicamerata, B. occulta quinquecamerata, B. rudis, B. speetonensis, B. speetonensis tunisiensis, B. whittakeri,

Blefuscuiana rudis

Citation: Blefuscuiana rudis Banner, Copestake & White, 1993
Rank: Species
Type locality: From a depth of 4275 m, Welll6/28-6RE,central North Sea.
Type level: Lowermost Cretaceous, lower Barremian, upper Valhall Formation.
Holotype Repository: London, UK; NHM
Holotype number: P52713

Current identification/main database link:


Original Description:

Test about 0.15-0.30mrn 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.


Extra details from original publication:

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.

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.


Catalog entry for Blefuscuiana rudis compiled by the pforams@mikrotax project team viewed: 23-5-2017

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