| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Quadrocystis
Taxonomy
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1982 | Quadrocystis Sprinkle p. 267 |
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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.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Sprinkle 1982 | DThecal shape slanted cylindrical, maximum diameter at or below midheight; ILL and LL circlets open; periproct medium-sized, surrounded by 4 thecal plates (IL4, IL5, L4, and L5); 8 rhombs and demirhombs; ambulacra medium length, extending down theca in RR sinuses; proximal stem medium-sized, tapering fairly slowly, mounted in deep basal cavity, outer columnals bearing granules and central equatorial groove. |
Measurements
No measurements are available
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| Source: o = order, p = phylum | |||||
| References: Aberhan et al. 2004, Aberhan 1992 | |||||
Age range: base of the Middle Ordovician to the top of the Blackriveran or 471.30000 to 449.60000 Ma
Collections (3 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Middle Ordovician | USA (Oklahoma) | Q. graffhami (201757) | |
| Blackriveran | USA (Oklahoma) | Q. graffhami (24103 73277) |