Nannotax3 - ntax_mesozoic - Acadialithus dennei Nannotax3 - ntax_mesozoic - Acadialithus dennei

Acadialithus dennei


Classification: ntax_mesozoic -> Nannoliths inc sedis -> Nannoliths inc sed - radiate multielement -> Acadialithus -> Acadialithus dennei
Sister taxa: A. dennei, A. valentinei

Distinguishing features:
Parent taxon (Acadialithus): Squat tube-shaped nannoliths; wall formed of two vertically stacked cycles, with 6-7 elements per cycle; wide central opening; c-axes oblique
This taxon: Acadialithus with 6 elements in each wall cycle


Taxonomy:

Citation: Acadialithus dennei Howe 2017
taxonomic rank: Species

Farinacci & Howe catalog pages: A. dennei *

Distinguishing features:
Parent taxon (Acadialithus): Squat tube-shaped nannoliths; wall formed of two vertically stacked cycles, with 6-7 elements per cycle; wide central opening; c-axes oblique
This taxon: Acadialithus with 6 elements in each wall cycle

Search data:
LITHS: nannolith-radiate, circular, star-shaped, cylindrical, polygonal, hollow, CA: vacant, CROSS-POLARS: rim-unicyclic, R-prominent,
Lith size: 8->10µm; Segments: 6->6;
Data source notes: original description & illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: Valentine (1980) recorded both A. dennei and A. valentinei n. sp. as a “common constituent” (Valentine, 1980, p. 74) from samples (12,700 to 13,240’) that he regarded as Berriasian. This interval also contains Polycostella senaria, so it is here regarded as Upper Tithonian. Unfortunately, Valentine (1980) did not present a detailed distribution chart for the COST B-3 well. Sinnyovsky (2005) records both A. dennei and A. valentinei n. sp. as common from sample Be 263, near the top of the Upper Tithonian. [Howe 2017]
Last occurrence (top): within Late Tithonian Substage (143.10-145.00Ma, top in Tithonian stage). Data source: Howe 2017
First occurrence (base): within Late Tithonian Substage (143.10-145.00Ma, base in Tithonian stage). Data source: Howe 2017

Plot of occurrence data:

References:

Howe, R. W. (2017). Acadialithus, a new nannofossil genus from offshore Eastern Newfoundland, Canada. Journal of Nannoplankton Research. 37(1): 61-66. gs

Varol, O. & Bowman, A. R. (2019). Taxonomic revision of selected Late Jurassic (Tithonian) calcareous nannofossils and the application of mobile mounting. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 291: 65-87. gs


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Acadialithus dennei compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 25-2-2024

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10003 Go to Archive.is to create a permanent copy of this page - citation notes
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