CATALOG OF ORIGINAL DESCRIPTIONS: Blefuscuiana laculata 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 laculata
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 laculata

Citation: Blefuscuiana laculata Banner et al. 1993
Rank: Species
Holotype Repository: London, UK; NHM
Type & figured specimens: P52724

Linked specimens: London, UK; NHM (PM PF 52724)

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


Original Description
Blefuscuiana laculata (sensu lato).
Diagnosis: Characterised by having 5 chambers in the last whorl, but with a test that is roughly quadrangular in outline, and by a broad, open umbilicus which the chambers do not overhang significantly.
Description: Test about 0.15-0.20mm at its maximum diameter, comprising at least two whorls of chambers coiled in a low trochospire. There are 4-5 chambers in the penultimate whorl and 5 chambers in the final whorl. The spiral side is almost flat to slightly concave. The chambers are symmetrical and increase in size gradually with growth. The chambers are subglobular in the penultimate whorl, and subglobular to slightly depressed (about 2/3 as high as long when viewed from the spiral side) in the final whorl. The umbilicus is broad, but the aperture is a narrow slit. No perforation cones are known.

Size: Test about 0.15-0.20mm at its maximum diameter,

Etymology: After laculatus, -a, -um, four-cornered, referring to the test outline.

Extra details from original publication
RemarksB. laculata clearly possesses 5 chambers abutting the umbilicus in the last whorl (e.g. PI. 3, figs. 1a-c), although only part of the first chamber of the last whorl may be seen ventrally. At first sight it resembles a species of Praehedbergella, and this, combined with its early stratigraphical range (i.e. Early Barremian) suggests that this species of Blefuscuiana had evolved directly from Praehedbergella. The rate of enlargement of the chambers of the last whorl, as seen dorsally, is much slower than in B. daminiae; also the equatorial outline of B. laculata is more quadrangular than that of B. daminiae, which is more circular.
Distribution: Central North Sea (wells); western Atlantic subseabed.
STRATIGRAPHY. Early Barremian.

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 laculata compiled by the pforams@mikrotax project team viewed: 22-1-2020

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