CATALOG OF ORIGINAL DESCRIPTIONS: Praehedbergella grigelisae Banner and Desai 1988

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 grigelisae
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 grigelisae

Citation: Praehedbergella grigelisae Banner and Desai 1988
Rank: Species
Type locality: Speeton Cliff, Filey Bay, North Yorkshire, England
Type age: Lower upper Aptian
Holotype Repository: London, UK; NHM
Type & figured specimens: pl. 2, figs. 8-13.; P52129

Linked specimens: London, UK; NHM (52129)

Current identification/main database link: Hedbergella sigali Moullade 1966


Original Description
The test consists of about two and a half whorls of chambers, with about 5 chambers in the first whorl, reducing to 4½ to 4 in the final whorl. The spiral side is gently convex, with clearly depressed sutures between the inflated chambers; the intercameral sutures are radial and are in length about half the chamber height. The umbilical side is more convex and has a narrow deep umbilicus, which in breadth is equal to about 1/7 of the test diameter. The chambers become slightly depressed with growth to become about 4/5 as high as long when seen on the spiral side. The aperture is a narrow slit, extending from the umbilicus to the periphery of the previous whorl, and is furnished with a porticus which is broadest at its umbilical end. The surface of the test is smooth and nonmuricate; it is uniformly microperforate, the microperforations being about 1µm in diameter.

Etymology: This species is named in honour of Algimantas Grigelis, Lithuanian Scientific Research Geological Institute, in recognition of her researches into Jurassic-Cretaceous planktonic foraminifera.

Extra details from original publication
Remarks. P . grigelisae differs from P . sigali (Moullade) (Hedbergella sigali Moullade, 1966) in its more depressed chambers, which enlarge more rapidly when seen in umbilical view, and in having a narrower umbilicus, and less deeply depressed sutures. It may be a Late Aptian direct descendant of P. sigali (type horizon Lower Barremian, but recorded by Moullade as high as Early Aptian). The chambers of P. grigelisae are much higher and less reniform than those of P. tatianae n. sp., a species with which there appears to be no intergradation.

Editors' Notes
The name oiginally appeared as P. grigelisae but was subsequently corrected by Banner et al. 1993 to P. grigelisi

References:

Banner, F. T. & Desai, D. (1988). A review and revision of the Jurassic-Early Cretaceous Globigerinina,with especial reference to the Aptian assemblages of Speeton (North Yorkshire, England). Journal of Micropalaeontology. 7: 143-185. gs :: ::

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

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Short stable page link: http://mikrotax.org/pforams/index.php?id=132014 Go to Archive.is to create a permanent copy of this page - citation notes



Comments (1)

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Le Coze

The name was emended into Praehedbergella grigelisi + subsp.

see: http://www.marinespecies.org/foraminifera/aphia.php?p=taxdetails&id=1035330

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Jeremy Young (UK)

thanks, I have added a note explaining this

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