Distinguishing features: Circular, shields broad, usually without a prominent inner tube cycle; central-area typically narrow, may contain a spine.
Daughter taxa (time control age-window is: 0-800Ma)![]() | ||||
![]() | ![]() | Discorhabdus biradiatus Discorhabdus with gaps between distal shield elements | ||
![]() | ![]() | ![]() | Discorhabdus corollatus Small Discorhabdus with narrow central area from which a tall, narrow spine protrudes. | |
![]() | ![]() | ![]() | ![]() | Discorhabdus criotus Discorhabdus with a narrow, distal inner cycle, narrow/closed central area and distal shield sutures that kink near the shield's outer edge. Bicyclic rim image. |
Discorhabdus hannibalis 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. | ||||
![]() | ![]() | ![]() | Discorhabdus ignotus Small to medium-sized Discorhabdus with closed central area that may or may not contain a spine. | |
![]() | Discorhabdus patulus Placoliths with a tall flaring spine. | |||
![]() | ![]() | ![]() | Discorhabdus striatus Medium to large Discorhabdus with closed central area. | |
![]() | Discorhabdus watkinsii Species with low broad open protrusion and reduced proximal shield, | |||
![]() | ![]() | ![]() | ![]() | Discorhabdus sp. Specimens not identified to species level |
Taxonomy:
Cenorbiculus Burns 1976
Farinacci & Howe catalog pages: Discorhabdus + * , Cenorbiculus * , Bidiscus *
Distinguishing features: Circular, shields broad, usually without a prominent inner tube cycle; central-area typically narrow, may contain a spine.
Search data:Tags | LITHS: placolith, circular, CA: process, closed, CROSS-POLARS: rim-bicyclic, V-prominent, |
Metrics | Lith size: 3->8µm; Data source notes: size range of included species |
Geological Range:
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): in lower part of Toarcian Stage (27% up, 180.4Ma, in Toarcian stage). Data source: Total of range of species in this database
Plot of occurrence data:
Bown, P. R. & Cooper, M. K. E. (1998). Jurassic. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 34-85. gs Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. gs V O Noël, D. (1965b). Sur les Coccolithes du Jurassique Européen et d'Afrique du Nord. Essai de classification des coccolithes fossiles. Éditions du Centre National de la Recherche Scientifique, Paris. 1-209. gsReferences:
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Discorhabdus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 21-4-2021
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10387 Go to Archive.is to create a permanent copy of this page - citation notes |