Distinguishing features: Wall formed of crystals with tangential c-axes (Thoracosphara s.l.)
| Daughter taxa: (blue => in age window 0-300Ma) | Granddaughter taxa | ||||
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| | | | Cysts with combination archaeopyle - formed from multiple plates and so with indented angular margin. | |
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| | | | 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 | |
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Taxonomy:
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: 18-10-2018
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