Catalog - Blefuscuiana laculata alobata Catalog - Blefuscuiana laculata alobata

CATALOG OF ORIGINAL DESCRIPTIONS: Blefuscuiana laculata alobata 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 laculata alobata
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 alobata

Citation: Blefuscuiana laculata alobata Banner, Copestake & White 1993
taxonomic rank: sub-species
Type specimens: 52726-9
Type age (chronostrat): Early Barremian
Type locality: Holotype. P52726 (PI. 3, figs. 3a-c), from central North Sea Well 20/2-2, 8680 m (Early Barremian). Paratypes. P52727 (PI. 3, figs. Sa-c), P52728 {PI. 3, fig. 4), P52729, all from the same sample as the holotype.
Type repository: London, UK; NHM

Linked specimens: London, UK; NHM (52728) London, UK; NHM (PM PF 52726) London, UK; NHM (52727) London, UK; NHM (52729)

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

Original Description

Diagnosis. - A subspecies of Blefuscuiana laculata Banner, Copestake and White, 1993, characterised by having intercameral sutural angles at the periphery of about 130-145 degrees; the test surface lacks perforation cones.

Referring to the less lobate test outline compared with the B. laculata s.s. (loba = lobe).

Extra details from original publication
REMARKS. This subspecies is distinguished from B. laculata s.s. in having less deeply depressed intercameral sutures at the periphery of the test. Although there is some overlap in the magnitude of this intercameral, peripheral angle between these taxa, the range that can be measured within a specimen is sufficient to distinguish clearly between the two subspecies. The evolutionary relationship between P. sigali s.s. and B. laculata s.s. has been suggested above. Since the difference between B. laculata s.s. and B. laculata alobata (i.e., the magnitude of the intercameral sutural angle at the periphery of the test) is analogous to those between the subspecies of P. sigali, we regard it probable that the whole P. sigali species-group as having evolved, as a plexus, into that of B. laculata. However, we believe that it is worth distinguishing morphologically between the subspecies of each species because such distinctions clarify the taxonomy of the Praehedbergellidae as a whole and provide the potential for palaeo-environmental, or palaeobiogeographic, or biostratigraphic discrimination.
DISTRIBUTION. Central North Sea.
STRATIGRAPHY. Early Barremian.


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 laculata alobata compiled by the pforams@mikrotax project team viewed: 18-7-2024

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Comments (2)

Le Coze

alobata alobata + no brackets for "Current identification/main database link: Blefuscuiana alobata (Banner, Copestake & White, 1993)"



Jeremy Young(UK)

thanks - all corrected now