CATALOG OF ORIGINAL DESCRIPTIONS: Praehedbergella subsp. sigali rasilis 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 rasilis
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 rasilis

Citation: Praehedbergella subsp. sigali rasilis Banner, Copestake & White 1993
Rank: sub-species
Type locality: Holotype. specimen figured by Gorbachik, 1986, PI. 24, fig. 1, from Katsa, Verkhoretse, southwestern Crimea, U.S.S.R.;
Type age: Late Barremian.

Current identification/main database link:


Original Description

DIAGNOSIS. A subspecies of P. sigali sensu lato characterized by its depressed chambers in the last whorl, which are about half as high as long, moderately depressed intercameral sutures, which form intercameral angles of about 140° at the periphery of the test, and a moderately lobate test outline (compared to the strongly lobate test of P. sigali sigali).
DESCRIPTION. Test about 0.20 mm at its maximum diameter, composed of about 2 whorls, coiled in a low trochospire, each with about 4½ chambers. Spiral side almost flat or slightly convex. Intercameral sutures forming angles of about 140° between chambers at the periphery of the test. The chambers are symmetrical and increase in size gradually with growth and become depressed, being almost half as high as long when viewed from the spiral side, in the last whorl. The aperture is a narrow slit bordered by a narrow porticus. The test surface lacks perforation cones.

Etymology: From Latin, rasilis, 'scraped, shaved, smoothed, polished', referring to the more rounded appearance of the test compared with P. sigali sigali.

Extra details from original publication
SYNONYMS REMARKS. The only published specimens definitely assigned to this species are those recorded by Moullade (1966) and Gorbachik (1986). The specimen figured by Caron (1985) is morphologically very similar, but it has not been described, the nature of its wall is obscure, and its stratigraphic primary provenance is uncertain (it was not mentioned by Caron, 1978, but she thought it to have come "from lower Aptian levels reworked in Albian sample"" when she later figured it in 1985). This subspecies has not so far been recorded from the North Sea.
DISTRIBUTION. Southern U.S.S.R.; Hautes-Alpes, south- eastern France; ?Walvis Ridge, South Atlantic Ocean.
STRATIGRAPHY. Recorded as ranging from Early Barremi- an-Early Aptian, i.e. the same range as recorded by Moullade (1966) for Praehedbergella sigali s.s.."

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

Gorbachik, T. N. (1986). Jurassic and early Cretaceous planktonic foraminifera of the south of the USSR. Moscow: Izdat. “Nauka”. 1986: 120-. gs

Moullade, M. (1966). Etude stratigraphique et micropaleontologique du Crétacé inférieur de la "fosse vocontienne". Documents des laboratories de géologie Lyon. 15: 1-369. gs


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Praehedbergella sigali rasilis compiled by the pforams@mikrotax project team viewed: 28-9-2020

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