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
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 |  |  |  | Calciodinellum
Cysts with combination archaeopyle - formed from multiple plates and so with indented angular margin.
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 |  |  |  | Centosphaera
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 |  |  |  | Cervisiella
Spherical, with circular archaeopyle, no paratabulation. Wall structure irregular with tangential c-axes.
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 |  |  |  | Fuettererella
Wall structure with radial fabric but tangential c-axes ("pseudoorthopithonellid")
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 |  |  |  | Lebessphaera
Cysts with tangential wall-structure and epicystal archaeopyles
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| | | | Operculodinella
Like Cervisiella but with paratabulation
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 |  |  |  | Scrippsiella
Cysts with tangential wall structure and compound archaeopyles. Wall formed of largish non-intelocking elements each with a spine
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 |  |  |  | Thoracosphaera
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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:
