CATALOG OF ORIGINAL DESCRIPTIONS: Heterohelix olssoni Georgescu 2000
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Citation: Heterohelix olssoni Georgescu 2000Rank: SpeciesType specimens: PC-ss-001-43bType age (chronostrat): Middle CenomanianType 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
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. Size: Etymology: Extra details from original publication
Editors' Notes
References:
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 teamviewed: 31-1-2023
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