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.
Linked specimens: London, UK; NHM (PM PF 52739)
Current identification/main database link: Hedbergella ruka (Banner, Copestake&White, 1993)
Original Description
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:
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.
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. gsReferences:

![]() |
Praehedbergella ruka compiled by the pforams@mikrotax project team viewed: 25-1-2026
Short stable page link: https://mikrotax.org/pforams/index.php?id=132017 Go to Archive.is to create a permanent copy of this page - citation notes |
This policy contains information about your privacy. By posting, you are declaring that you understand this policy:
This policy is subject to change at any time and without notice.
These terms and conditions contain rules about posting comments. By submitting a comment, you are declaring that you agree with these rules:
Failure to comply with these rules may result in being banned from submitting further comments.
These terms and conditions are subject to change at any time and without notice.
Comments