CATALOG OF ORIGINAL DESCRIPTIONS: Praehedbergella pseudosigali 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 -> P -> Praehedbergella -> Praehedbergella pseudosigali
Other pages this level: P. grigelisae, P. grigelisi perforare, P. pseudosigali, P. ruka, P. ruka contritus, P. ruka papillata, P. ruka ruka, P. sigali compacta, P. sigali rasilis, P. tatianae,

Praehedbergella pseudosigali

Citation: Praehedbergella pseudosigali Banner et al. 1993
Rank: Species
Type locality: Central North Sea Well 20/2- 2, (8370 m).
Type age: Late Barremian
Holotype Repository: London, UK; NHM
Type & figured specimens: P52735,

Linked specimens: London, UK; NHM (PM PF 52735)

Current identification/main database link:


Original Description

Diagnosis: Characterized by the presence of perforation cones, low trochospire, relatively large number of chambers (about 6½) in the penultimate whorl, gradual opening of the spire and high-arched aperture.

Description: Test about 0.25mm at its maximum diameter, consisting of two whorls of chambers coiled in a low trochospire. There are about 6½ chambers in the penultimate and 4½ in the last whorl. The spiral side is only slightly convex, with intercameral sutures forming intercameral angle of sutural depression at the periphery of about 145°. The chambers themselves are symmetrical and increase in size gradually with growth, those (excluding the final chamber) in the last whorl become depressed , being about half as high as long (compared with about 2/3 as high as long in the final chamber) on the spiral side. The umbilicus is small and the aperture is a high arch, with a very narrow porticos. Perforation cones are visible on chambers of the last whorl.


Etymology: After superficial similarity of this species to P. sigali.

Extra details from original publication
REMARKS. The presence of perforation cones, the numerous (about 6½) chambers in the first whorl, and the high-arched aperture is sufficient to describe this as a new species, and in particular to distinguish it from P. sigali (Moullade) sensu lato.
DISTRIBUTION. Central North Sea (Well 20/2-2, 8370 m).
STRATIGRAPHY. Late 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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Praehedbergella pseudosigali compiled by the pforams@mikrotax project team viewed: 14-7-2020

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