CATALOG OF ORIGINAL DESCRIPTIONS: Praehedbergella ruka 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 ruka
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 ruka

Citation: Praehedbergella ruka Banner et al. 1993
Rank: Species

Linked specimens: London, UK; NHM (PM PF 52739)

Current identification/main database link: Hedbergella ruka (Banner, Copestake and White, 1993)


Original Description
Praehedbergella ruka n.sp. sensu. lato.
DIAGNOSIS. Characterized by its high trochospire, strong dorsal covexity (and 4 to 4½ chambers in the last whorl).
DESCRIPTION. Test about 0.15 mm at its maximum diameter ' comprising about three whorls coiled in a high trochospire. There are 5 chambers in the penultimate whorl but 4-4½ in the final whorl. The spiral side is strongly convex and the intercameral sutures are moderately depressed forming inter- cameral angles of about 135°-140° at the periphery of the test. The chambers are symmetrical and increase in size gradually with growth. The chambers in the last whorl are either slightly depressed (about 2/3 as high as long when viewed from the spiral side), or depressed (about half as high as long when viewed dorsally). The final chamber may be about as high as long. The umbilicus is small and the aperture is a narrow slit.

Etymology: After the Norwegian ruka, meaning a heap, stack or pile, referring to the 'heap' of chambers forming the high spire and very convex dorsal surface.

Extra details from original publication

REMARKS. This species of Praehedbergella has a dorsal convexity greater than that of any other known species of the genus, but which is matched only by a new species of Blefuscuiana (B. cumulus) described below.
STRATIGRAPHY. Aptian.

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 ruka compiled by the pforams@mikrotax project team viewed: 14-7-2020

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