CATALOG OF ORIGINAL DESCRIPTIONS: Blefuscuiana aptiana depressa 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 aptiana depressa
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 aptiana depressa

Citation: Blefuscuiana aptiana depressa Banner, Copestake & White 1993
Rank: sub-species
Type locality: North Sea Well 16/28-6RE, 4260 m
Type age: Early Barremian
Holotype Repository: London, UK; NHM
Type & figured specimens: 52711

Linked specimens: London, UK; NHM (PM PF 52711)

Current identification/main database link: Blefuscuiana depressa Banner, Copestake & White, 1993


Original Description
Test about 0.15-0.2mm at its maximum diameter, comprising about 2-3 whorls coiled in a low trochospire, each with 5-5.5 chambers. The spiral side is almost flat or slightly convex and the intercameral sutures are moderately depressed, forming angles of about 130-135 degrees at the periphery of the test. The chambers are symmetrical and increase in size gradually with growth, becoming depressed in the second and (when present) third whorl, being about half as high as long when viewed dorsally. The last chamber may be about as high as long. The umbilicus is 'open' and the aperture appears to be a narrow slit. The test surface lacks perforation cones.

Size: Test about 0.15-0.2mm

Etymology: After the depressed form of the chambers in the last whorl.

Extra details from original publication
REMARKS. The depressed chambers in the last whorl of this species, combined with the absence of perforation cones distinguishes this subspecies from others of B. aptiana.
DISTRIBUTION. Central North Sea (Wells).
STRATIGRAPHY. Early Barremian-earliest 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 aptiana depressa compiled by the pforams@mikrotax project team viewed: 9-12-2019

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