Tangential wall


Classification: ntax_non_cocco -> Dinophytes -> Thoracosphaeraceae -> Tangential wall
Sister taxa: Tangential wall, Radial wall, Oblique wall, Possible Thoracosphaeraceae, Pithonellid, Calcispheres inc sedis, unidentified calcispheres

Distinguishing features: Wall formed of crystals with tangential c-axes (Thoracosphara s.l.)

Daughter taxa (time control age-window is: 0-800Ma)Granddaughter taxa
Calcigonellum


Calciodinellum
Cysts with combination archaeopyle - formed from multiple plates and so with indented angular margin.

Centosphaera


Cervisiella
Spherical, with circular archaeopyle, no paratabulation. Wall structure irregular with tangential c-axes.

Fuettererella
Wall structure with radial fabric but tangential c-axes ("pseudoorthopithonellid")

Lebessphaera
Cysts with tangential wall-structure and epicystal archaeopyles

Operculodinella
Like Cervisiella but with paratabulation

Scrippsiella
Cysts with tangential wall structure and compound archaeopyles. Wall formed of largish non-intelocking elements each with a spine

Thoracosphaera


Taxonomy:

Synonyms:
Taxonomic discussion: Generic classification within this group is now primarily based on the archaeopyle type - i.e. the number of plates interpreted to have formed the archaeopyle, largely following Streng et al. (2004). Nannofosil workers havetraditionally inlcuded most of these in Thoracosphaera

Catalog entries: Tangential wall [no catalog entry yet]

Distinguishing features: Wall formed of crystals with tangential c-axes (Thoracosphara s.l.)

Geological Range:
Last occurrence (top): Extant Data source: Total of range of species in this database
First occurrence (base): within Carnian Stage (228.35-237.00Ma, base in Carnian stage). Data source: Total of range of species in this database

References:


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Tangential wall compiled by Jeremy R. Young viewed: 22-4-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=20461 Go to Archive.is to create a permanent copy of this page - citation notes



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