Tangential wall


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

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

Daughter taxa (blue => in age window 0-300Ma) Granddaughter taxa


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



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

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

Cysts with tangential wall-structure and epicystal archaeopyles

Like Cervisiella but with paratabulation

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



Taxonomy:

Synonyms:
Notes & 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

Short diagnosis: 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


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Tangential wall compiled by Jeremy R. Young viewed: 16-12-2017

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