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Tatonkacystis
Taxonomy
Tatonkacystis was named by Sumrall et al. (1997) [Sepkoski's age data: Cm Fran]. Its type is Tatonkacystis codyensis.
It was assigned to Trachelocrinidae by Sumrall et al. (1997); and to Eocrinoidea by Sepkoski (2002).
It was assigned to Trachelocrinidae by Sumrall et al. (1997); and to Eocrinoidea by Sepkoski (2002).
Species
T. codyensis (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 1997 | Tatonkacystis Sumrall et al. p. 1098 |
| 2002 | Tatonkacystis Sepkoski |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
G. †Tatonkacystis Sumrall et al. 1997
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†Tatonkacystis codyensis Sumrall et al. 1997
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. D. Sumrall et al. 1997 | Theca elongate, nearly twice as long as wide; bearing about 65 hexagonal ridged thecal plates per side; thecal plates without epispires, aligned in columns, wider than long; summit developed into constricted spout with five large biserial arms bearing smaller brachioles every third to fourth plate; stem long, holomeric, enlarged, nodal every 16-18 columnals. |
Measurements
No measurements are available
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| Source: g = genus, c = class, p = phylum | |||||
| References: Aberhan 1992, Aberhan et al. 2004, Hendy et al. 2009 | |||||
Age range: Franconian or 497.00000 to 485.40000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Franconian | USA (Wyoming) | T. codyensis (9514) |