Catalog - Heterohelix olssoni <title>Catalog - Heterohelix olssoni

CATALOG OF ORIGINAL DESCRIPTIONS: Heterohelix olssoni Georgescu 2000

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 -> H -> Heterohelix -> Heterohelix olssoni
Other pages this level: H. (Chiloguembelina) pseudotessera directa, H. (Heterohelix) planeobtusa, H. dentata, H. fayose, H. hohenemsensis, H. ivandeklaszi, H. labellosa, H. navarroensis, H. nkporoensis, H. olssoni, H. orientalis, H. pachymarginata, H. pseudoglobulosa, H. pseudoreussi, H. robusta, H. rumseyensis, H. sphenoides, H. stenopos, H. striata aegyptiaca, H. suwalkensis, H. trochospiralis, H. varsoviensis, H. virgata, H. vistulaensis

Heterohelix olssoni

Citation: Heterohelix olssoni Georgescu 2000
Rank: Species
Type specimens: PC-ss-001-43b
Type age (chronostrat): Middle Cenomanian
Type locality: Middle part of the dark coloured marls and claystones with rare sandy interbeds of the Tomis Formation (middle Cenomanian, R. reicheli zone, 18 Lotus borehole), Romanian Western Black Sea offshore.
Type repository: Petromar Collection

Current identification/main database link: Planoheterohelix olssoni (Georgescu, 2000)

Original Description

Stout test having well developed early planispirally enrolled test. The primary stage is followed by a biserial one consisting of two to (rarely) tree pairs of chambers. Chambers subglobular to globular, sometimes slightly dorso-ventrally flattened. Sutures straight to slightly depressed. Wall finely perforate. Test surface is smooth, unornamented, lacking any trace of striae. Primary aperture, a low arch at the base of the last formed chamber, is bordered by a narrow imperforate lip.



Extra details from original publication

Editors' Notes


Georgescu, M. D. (1995). Upper Cretaceous Heterohelicidae in the Romanian Western Black Sea offshore. Revista Española de Micropaleontología. 27: 91-106. gs

Georgescu, M. D. (2000). Late Albian-Turonian planktonic foraminifera in the Romanian western Black Sea offshore. Revista Española de Micropaleontología. 32: 157-173. gs


Heterohelix olssoni compiled by the pforams@mikrotax project team viewed: 31-1-2023

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