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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 is the type genus of Quadrothecidae.
It was assigned to Orthothecidae by Fisher (1962); to Hyolithida by Sepkoski (2002); and to Quadrothecidae by Malinky (2002).
It was assigned to Orthothecidae by Fisher (1962); to Hyolithida by Sepkoski (2002); and to Quadrothecidae by Malinky (2002).
Species
Species lacking formal opinion data
Entered
by J. Sepkoski on 2003-01-23; modified by P. Novack-Gottshall on 2026-07-19
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.
G. †Quadrotheca Sysoyev 1958
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†Quadrotheca quadrangularis Holm 1893
†Quadrotheca shipaiensis Qian et al. 1979
Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: g = genus, p = phylum | |||||
| References: d'Eichwald 1840, Hendy et al. 2009 | |||||
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) |