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Hemitrochiscus
Taxonomy
Hemitrochiscus was named by von Schauroth (1854) [Sepkoski's age data: P Guad]. It is the type genus of Hemitrochiscidae.
It was assigned to Cyclida by Sepkoski (2002); and to Hemitrochiscidae by Glaessner (1969), Schweitzer et al. (2020), Schram and Koenemann (2021).
It was assigned to Cyclida by Sepkoski (2002); and to Hemitrochiscidae by Glaessner (1969), Schweitzer et al. (2020), Schram and Koenemann (2021).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1854 | Hemitrochiscus von Schauroth p. 558 |
| 1969 | Hemitrochiscus Glaessner p. 569 |
| 2002 | Hemitrochiscus Sepkoski |
| 2020 | Hemitrochiscus Schweitzer et al. p. 278 |
| 2021 | Hemitrochiscus Schram and Koenemann p. 235 |
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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. †Hemitrochiscus von Schauroth 1854
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†Hemitrochiscus paradoxus von Schauroth 1854
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. E. Schweitzer et al. 2020 | Carapace semi-circular, strongly domed, optic notches deep; vermiform lines on posterolateral margins of carapace; thoracic somites visible ventrally and laterally where carapace is broken. |
Measurements
No measurements are available
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| Source: p = phylum | |||||
| Reference: Kiessling 2004 | |||||
Age range: Wuchiapingian or 259.51000 to 254.14000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Wuchiapingian | Germany | H. paradoxus (161271) |