CATALOG OF ORIGINAL DESCRIPTIONS: Praehedbergella sigali compacta 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 -> P -> Praehedbergella -> Praehedbergella sigali compacta
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 sigali compacta

Citation: Praehedbergella sigali compacta Banner, Copestake & White 1993
Rank: sub-species
Type locality: Central North Sea Well 20/2-2, 8680 ft
Type age: Early Barremian
Holotype Repository: London, UK; NHM
Type & figured specimens: 52746

Linked specimens: London, UK; NHM (PM PF 52746)

Current identification/main database link: Hedbergella compacta (Banner, Copestake & White, 1993)


Original Description

DIAGNOSIS. A subspecies of P. sigali (Moullade) sensu lato, characterized by chambers which (sometimes excluding the final chamber) become depressed in the last whorl and have heights about half their lengths (when viewed from the spiral side), by relatively shallow intercameral sutures, which form intercameral angles of about 150° at the test periphery, and by a 'compact' test outline.
DESCRIPTION. Test about 0.10-0.15 mm at its maximum diameter, comprising about two whorls, each with 4l!2 cham- bers coiled in a low trochospire. The spiral side is almost flat or slightly convex. The depressions of intercameral sutures at the periphery of the test form angles of about 150° between adjacent chambers. The chambers themselves are symmetri- cal and increase in size gradually with growth and become depressed, being almost half as high as long when viewed on the spiral side (excluding the final chamber); the final cham- ber is only slightly lower than long. The umbilicus measures about 0.02 mm in diameter, and the aperture is a narrow slit with a narrow porticus. Perforation cones are not present.

Size: 0.10-0.15 mm at its maximum diameter

Etymology: After the more 'compact' outline of the test compared with P. sigali sigali.

Extra details from original publication
REMARKS. The 'compact' test outline in this species is apparently a consequence of the depressed chambers combined with the relatively shallow intercameral sutural depressions at its periphery. A specimen figured by Moullade (1966, Pl. 7, fig. 20) resembles this species but has been photographed at a slightly oblique angle and should, therefore, only tentatively be included here in synonymy.
DISTRIBUTION. Central North Sea (Well 16/28-6RE, 4150.5 m, 4160.7 m, 4200 m; Well 20/2-2, 8680 m) ; ?Hautes-Alpes, southeastern France.
STRATIGRAPHY. EarlyBarremian-EarlyAptian.

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


logo

Praehedbergella sigali compacta compiled by the pforams@mikrotax project team viewed: 26-1-2020

Taxon Search:
Advanced Search

Short stable page link: http://mikrotax.org/pforams/index.php?id=132021 Go to Archive.is to create a permanent copy of this page - citation notes



Comments (0)

No comments yet. Be the first!

Add Comment

* Required information
1000
Captcha Image
Powered by Commentics