CATALOG OF ORIGINAL DESCRIPTIONS: Blefuscuiana praesimilis 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 praesimilis
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 praesimilis

Citation: Blefuscuiana praesimilis Banner et al. 1993
Rank: Species
Type locality: Holotype. P52691 (PI. 8, figs. 4a-b) from Central North Sea Well 20/2-2, 8680 ft,Early Barrernian. Paratypes. P52692 (PI. 8, fig. 5), P52694, both from same sample as holotype; P52693 (PI. 8, fig. 6), P52695, from the same well, at 8600 ft, also Early Barremian.
Type age: Early Barrernian.
Holotype Repository: London, UK; NHM
Type & figured specimens: 52691-5

Linked specimens: London, UK; NHM (52694) London, UK; NHM (PM PF 52691) London, UK; NHM (52692) London, UK; NHM (52695) London, UK; NHM (52693)

Current identification/main database link:


Original Description

DIAGNOSIS. Characterised by a very broad umbilicus, subglobular chambers which become nearly as high as long when viewed dorsally, an almost planar dorsal side with depressed sutures, and a markedly lobulate equatorial periphery.
DESCRIPTION. Test about 0.15-0.20 mm at its maximum diameter, comprising about 2 whorls coiled in a low trochospire. There are about 5-6 chambers in the last whorl , but this is an ontogenetic increase as the penultimate may have only 4-5. The spiral side is almost flat, slightly concave or slightly convex, with depressed sutures, and the intercameral sutures form angles of about 140° at the periphery of the test, which becomes markedly lobulate. The chambers are symmetrical and increase in size gradually with growth. They are typically globular to slightly depressed (about 2/3 as high as long when viewed from the spiral side) in the last whorl. The umbilicus is very broad (about one-third of the test diameter). The aperture appears to be a narrow slit. Perforation cones have not been found on this species.

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

Etymology: After similarity to Lilliputianella similis, which it precedes stratigraphically.

Extra details from original publication
REMARKS. This species resembles Lilliputianella similis (compare PI. 8, figs. 4-6 with PI. 8, fig. 8), and is probably immediately ancestral to it, even though it is not yet known from the late Barremian. B. praesimilis is distinguished from B. aptiana s.l. in having a broader umbilicus.
DISTRIBUTION. Central North Sea (wells).
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 praesimilis compiled by the pforams@mikrotax project team viewed: 9-12-2019

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