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Rizoceras
Taxonomy
Rizoceras was named by Hyatt (1884). It is the type genus of Rizoceratidae.
It was assigned to Rizoceratidae by Hyatt (1900); to Maelonoceratidae by Miagkova (1967); to Oncoceratidae by Teichert et al. (1964) and Crick (1981); and to Oncoceratida by Sepkoski (2002).
It was assigned to Rizoceratidae by Hyatt (1900); to Maelonoceratidae by Miagkova (1967); to Oncoceratidae by Teichert et al. (1964) and Crick (1981); and to Oncoceratida by Sepkoski (2002).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1884 | Rizoceras Hyatt p. 276 |
| 1900 | Rizoceras Hyatt p. 529 |
| 1964 | Rizoceras Teichert et al. p. 288 |
| 1967 | Rizoceras Miagkova |
| 1981 | Rizoceras Crick p. 229 |
| 2002 | Rizoceras 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. †Rizoceras Hyatt 1884
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†Rizoceras acris Miagkova 1967
†Rizoceras inventum Miagkova 1967
†Rizoceras rectum Miagkova 1967
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. Hyatt 1900 | Orthoceracones and cyrtoceracones expanding regularly by growth throughout life, the living chamber very slightly or not sensibly contracted in gerontic stage. Aperture constantly open, and with slight dorsal as well as somewhat deeper and
broader hyponomic sinuses. Siphuncle generally small and empty, but actiniform lamellae and an endosiphuncle sometimes occur. Shells as a rule smooth or with transverse bands only, but longitudinal striae often present in earlier stages |
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| References: Aberhan et al. 2004, Kiessling 2004 | |||||
Age range: base of the Kirkfieldian to the top of the Llandovery or 457.30000 to 433.40000 Ma
Collections (6 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Soudleyan - Marshbrookian | China (Shaanxi) | R. sp. (8540) | |
| Kirkfieldian | United Kingdom (Northern Ireland) | R. sp. (89154) | |
| Actonian - Onnian | China (Shaanxi) | R. sp. (8539) | |
| Richmondian - Ashgill | USA (Ohio) | R. sp. (394) | |
| Cautleyan - Rawtheyan | China (Shaanxi) | R. sp. (8537) | |
| Llandovery | Russian Federation (Siberia) | R. acutum, R. inventum, R. rectum, R. acris (206333) |