CATALOG OF ORIGINAL DESCRIPTIONS: Blefuscuiana subsp. occulta perforocculta Banner et al. 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 occulta perforocculta
Other pages this level: B. albiana, B. aptiana depressa, B. aptiana implana, B. aptiana orientalis, B. daminiae, B. excelsa cumulus, B. globigerinellinoides 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 occulta perforocculta

Citation: Blefuscuiana subsp. occulta perforocculta Banner et al. 1993
Rank: sub-species
Type locality: Holotype. P52677 (PI. 8, figs. 2a-c), from Central North Sea Well 20/2-2, 8300 m, Early Aptian. Paratypes. P52678 (pl. 8, fig. 3), P52681, from the same sample as the holotype; P52679, from Central North Sea Well 15/30-3, 12830-12840 ft, Early Aptian , and P52680, from Central North Sea Well16/28- 6RE, 4014.37 m, Late Aptian
Type age: Early Aptian
Holotype Repository: London, UK; NHM
Type & figured specimens: P52677-9

Linked specimens: London, UK; NHM (PM PF 52677) London, UK; NHM (52679)

Current identification/main database link:


Original Description

DESCRIPTION. Test about 0.20-0.25 mm at its maximum diameter, comprising about 3 whorls coiled in a low trochospire. There are 5½ -7 chambers in each of the penultimate and last whorls. The spiral side is almost flat. The intercameral sutures are depressed to form angles of about 130°-140° at the periphery of the test. The chambers are symmetrical, increase in size gradually with growth, and are typically subglobular. The umbilicus is broad and the aperture appears to be a narrow slit. Perforation cones are present dorsally and ventrally on the chambers of the last whorl.


Etymology: Perfor-, + occulta, the clearly perforate form of the  species.

Extra details from original publication
REMARKS. This form is rare in the Late Barremian (so far found in beds of this age only in Well 20/2-2 at 8370 ft), but it occurs quite commonly in beds considered to be Early Aptian and it ranges up into Late Aptian sediments. Therefore, it appears older than B. occulta sensu stricto, and to acme earlier and to disappear earlier; it may prove to be the phylogenetically older form of the species.
DISTRIBUTION. Central North Sea (wells).
STRATIGRAPHY. Late 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. gs :: ::


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Blefuscuiana occulta perforocculta compiled by the pforams@mikrotax project team viewed: 5-8-2020

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