Catalog - Praehedbergella ruka ruka Catalog - Praehedbergella ruka ruka

CATALOG OF ORIGINAL DESCRIPTIONS: Praehedbergella ruka ruka 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 ruka 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 ruka

Citation: Praehedbergella ruka ruka Banner, Copestake&White 1993
Taxonomic rank: sub-species
Type specimens: P52739
Type age (chronostrat): Lower Aptian
Type locality: Well 16/28-6RE, North Sea
Type repository: London, UK; NHM

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


Original Description

Praehedbergella ruka n.sp. sensu stricto PI. 1, figs. 2a-c
DIAGNOSIS. Characterized by its high trochospire, strong dorsal convexity, slightly depressed chambers (about 2/3 as high as long) in the last whorl (excluding the final chamber which may be subglobular), and a smooth test surface lacking perforation cones.

Extra details from original publication
REMARKS. P. ruka ruka is distinguished from the other ruka subspecies by having only slightly depressed chambers and by lacking perforation cones.
DISTRIBUTION. Central North Sea.
STRATIGRAPHY. Early Aptian

Editors' Notes
The subspecies was named Praehedbergella ruka n.sp. sensu stricto, in distinction from Praehedbergella ruka papillata and Praehedbergella ruka contritus. However, the correct name under the ICZN is Praehedbergella ruka ruka and this name is applied automatically.

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 ruka compiled by the pforams@mikrotax project team viewed: 19-5-2026

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Comments (4)

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Hi Jeremy,

Thank you for your answer. I was not aware of this rule.

In your opinion how should be considered Praehedbergella ruka lato sensu? Is "lato sensu" including "stricto sensu" and is to be included pro parte under the genus Hedbergella?

François

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To clarify - what Banner et al. did was to create a new species P. ruka and also to define formally two sub-species within it - P. ruka papillata and P. ruka contritus. By doing so they also automatically created the additional subspecies P. ruka ruka which would include the holotype [ICZN Arts 46 Principle of Coordination & 47. Nominotypical taxa]. For some strange reason though they referred to the species P. ruka (incling all three sub-species) as P. ruka sensu lato and to the species excluding the two separately named sub-species as P. ruka sensu stricto. Why they did so is a mystery to me, especially as all the authors were good taxonomists, working in the Natural History Museum and with expert working knowledge of the ICZN. Nonetheless, the idiosyncratic terminology they adopted is of no special relevance and the correct names must be P. ruka and P. ruka ruka.

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Praehedbergella ruka stricto sensu?

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Yes and no - as I see it, Praehedbergella ruka stricto sensu is the name in the publication but the correct name is Praehedbergella ruka ruka according to ICZN Art47 (Nominotypical taxa) and since this name was automatically established it the correct way to cite the taxon.