Discorhabdus hannibalis


Classification: Mesozoic -> Podorhabdales -> Biscutaceae -> Discorhabdus -> Discorhabdus hannibalis
Sister taxa: D. biradiatus, D. corollatus, D. criotus, D. hannibalis, D. ignotus, D. patulus, D. striatus, D. watkinsii, D. sp.,

Distinguishing features: Small (3-5 µm), with two closely appressed shields; proximal shield is wider than the distal shield, protruding beyond it and is at least twice as thick as the distal shield in side view.


Taxonomy:

Citation: Discorhabdus hannibalis Aguado, 2012
Rank: Species

Farinacci & Howe catalog pages: Discorhabdus hannibalis *

Distinguishing features: Small (3-5 µm), with two closely appressed shields; proximal shield is wider than the distal shield, protruding beyond it and is at least twice as thick as the distal shield in side view.


Morphology remarks: Although this species has a typical placolith structure, it has a peculiar shield construction (proximal shield wider and thicker than the distal one) that is not seen in any other species of the genus Discorhabdus. Due to the thick proximal shield this species also shows much stronger birrefingence than typical Discorhabdus.

See also: Helicorhabdus asymetricus - similar form with spine, possibly a senior synonym;

Geological Range:
Notes: source Aguado (2012)
Oued Bahloul (Tunisia), upper Cenomanian to lower Turonian (Subzone UC3c–UC6c);
El Chorro section (Betic Cordillera, Spain), lower Cenomanian (Zone UC3).
Last occurrence (top): within UC6 zone (93.55-93.90Ma, top in Turonian stage). Data source: Aguado 2012
First occurrence (base): within UC3c subzone (94.79-95.02Ma, base in Cenomanian stage). Data source: Aguado 2012

Plot of occurrence data:

  • (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Discorhabdus

    References:

    Aguado, R. (2012). Two new Cretaceous calcareous nannofossils from SE Spain and Tunisia. Journal of Nannoplankton Research. 32(2): -. gs


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    Discorhabdus hannibalis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-1-2020

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10391 Go to Archive.is to create a permanent copy of this page - citation notes



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