CATALOG OF ORIGINAL DESCRIPTIONS: Blefuscuiana aptiana implana 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 implana
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 implana

Citation: Blefuscuiana aptiana implana Banner, Copestake & White 1993
Rank: sub-species
Type locality: North Sea Well 20/2- 2, 8210 ft,
Type age: Early Aptian
Holotype Repository: London, UK; NHM
Type & figured specimens: 52705

Linked specimens: London, UK; NHM (PM PF 52705)

Current identification/main database link: Blefuscuiana implana 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. There are 5-6 chambers in each of the penultimate and last whorls. The spiral side is almost flat or slightly convex and the intercameral sutures are moderately depressed, forming angles of about 130-140 degrees at the periphery of the test. The chambers are symmetrical and increase in size gradually with growth, they are typically subglobular to slightly depressed (about 7) as high as long when viewed from the spiral side) in the last whorl, although in some the first 1-2 chambers in the last whorl may be more strongly depressed (about half as high as long). The umbilicus is broadly open and the aperture is a narrow slit. Perforation cones are present on chambers of the last whorl.

Etymology: After implanus, uneven, referring to the rough sur- face of the test resulting from the presence of perforation cones.

Extra details from original publication
REMARKS. This subspecies differs from others of aptiana in having perforation cones.
DISTRIBUTION. Central North Sea (Well).
STRATIGRAPHY. Late Barremian-Late Aptian


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


Blefuscuiana aptiana implana compiled by the pforams@mikrotax project team viewed: 26-2-2020

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