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Quadrotheca
Taxonomy
Quadrotheca was named by Sysoyev (1958) [Sepkoski's age data: Cm Tomm-u O Cara-u Sepkoski's reference number: 1,268,1116].
It was assigned to Orthothecidae by Fisher (1962); and to Hyolithida by Sepkoski (2002).
It was assigned to Orthothecidae by Fisher (1962); and to Hyolithida by Sepkoski (2002).
Species
Species lacking formal opinion data
Synonymy list
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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
No diagnoses are available
Measurements
No measurements are available
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| Source: g = genus, p = phylum | |||||
| References: Hendy et al. 2009, d'Eichwald 1840 | |||||
Age range: base of the Meishucunian to the top of the Pirgu or 530.70000 to 445.20000 Ma
Collections (3 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Meishucunian | China (Hubei) | Q. shipaiensis (107634) | |
| Caradoc | Poland | Q. aetherica (233108) | |
| Pirgu | Sweden | Q. sp. (165077) |