Nannotax3 - Mesozoic

Thecatus

Classification: Mesozoic -> Holococcoliths -> Rarer genera -> Thecatus
Sister taxa: Bifidalithus, Bilapillus, Multipartis, Munarinus, Octolithus, Okkolithus, Ottavianus, Pharus, Ramsaya, Russellia, Saepiovirgata, Acuturris, Anfractus, Duocameratus, Lacunolithus-Bown, Metadoga, Nicholasia, Paulpearsonia, Petrobrasiella, Pseudoconus, Semihololithus, Stereorhabdus, Tanzanella, Thecatus, unidentified holococcoliths,

Distinguishing features: Cavate holococcolith with box-shape, high rim and thin proximal plate, short spine on distal surface

Daughter taxa: (blue => in age window 0-800Ma)
				Thecatus varolii
				Thecatus sp. Specimens not identified to species level

Taxonomy:

Citation: Thecatus Lees, 2007

Rank: Genus

Type species: Thecatus varolii Lees, 2007

Farinacci & Howe catalog pages: Thecatus *

Distinguishing features: Cavate holococcolith with box-shape, high rim and thin proximal plate, short spine on distal surface

Morphology remarks: "A cavate, box-shaped holococcolith. At 0 ̊, in side view in XPL, the rim is relatively tall and the proximal plate thin. A bipar- tite structure/short spine sits atop the rim, completing the box shape. The spine is not visible on rotation." [Lees 2007]

Search data:

Tags	LITHS: holococcolith, elliptical, quadrate, hollow,
Metrics	Lith size: 3->5µm; Sources: size range of included species

The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): near base of Turonian Stage (8% up, 93.6Ma, in Turonian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Turonian Stage (4% up, 93.7Ma, in Turonian stage). Data source: Total of range of species in this database

Plot of occurrence data:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Neptune data: This is a higher taxon page so Neptune data is not plotted. See also: customisable plot Parent: Rarer genera

References:

Lees, J. A. (2007). New and rarely reported calcareous nannofossils from the Late Cretaceous of coastal Tanzania: outcrop samples and Tanzania Drilling Project Sites 5, 9 and 15. Journal of Nannoplankton Research. 29(1): 39-65. gs

Thecatus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 27-2-2020

Taxon Search:

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=11211 Go to Archive.is to create a permanent copy of this page - citation notes

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