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Tichvinskia
Taxonomy
Tichvinskia was named by Chudinov and Vjushkov (1956). Its type is Burtensia burtensis.
It was assigned to Procolophoninae by Spencer and Benton (2000); to Leptopleuroninae by Modesto and Damiani (2007); and to Procolophonidae by Vjushkov and Chudinov (1956), Chudinov and Vjushkov (1956), Carroll (1988), Modesto et al. (2002), Säilä (2008) and Ivakhnenko (2008).
It was assigned to Procolophoninae by Spencer and Benton (2000); to Leptopleuroninae by Modesto and Damiani (2007); and to Procolophonidae by Vjushkov and Chudinov (1956), Chudinov and Vjushkov (1956), Carroll (1988), Modesto et al. (2002), Säilä (2008) and Ivakhnenko (2008).
Species
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1956 | Tichvinskia Chudinov and Vjushkov p. 548 |
| 1956 | Tichvinskia Vjushkov and Chudinov p. 142 |
| 1975 | Burtensia Ivakhnenko p. 89 |
| 1988 | Burtensia Carroll |
| 1988 | Tichvinskia Carroll |
| 1991 | Burtensia Novikov p. 74 |
| 2000 | Tichvinskia Spencer and Benton p. 165 |
| 2002 | Tichvinskia Modesto et al. p. 891 fig. 4 |
| 2007 | Tichvinskia Modesto and Damiani p. 347 fig. 8 |
| 2008 | Burtensia Ivakhnenko |
| 2008 | Tichvinskia Ivakhnenko p. 55 |
| 2008 | Tichvinskia Säilä p. 1202 fig. 4 |
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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. †Tichvinskia Chudinov and Vjushkov 1956
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†Tichvinskia burtensis Ochev 1958
†Tichvinskia vjatkensis Chudinov and Vjushkov 1956
Invalid names: Burtensia Ivakhnenko 1975 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| P. K. Chudinov and B. P. Vjushkov 1956 | Translated [Skull triangular with large orbito-temporal openings, which make up almost 3/4 of the length of the skull. Parietal foramen very large and round. Posterior margin of skull roof concave and formed by postparietal and tabular. Otic notch shallow. Interpterygoidal vacuity large and elliptical. Basisphenoid short and broad. Lateral portions of pterygoid and transversal flanges form a downward directed process. Pterygoids, palatines and vomers bear rows of small teeth, which are larger on the anterior end of the vomer. Jaw joint almost at same level as occipital condyle. Three teeth on premaxilla, 7-8 on maxilla, 7-8 on dentary. Lower jaw relatively massive and high. Anterior 2-3 mandibular teeth are rather slender, conical with blunt tip. Teeth 5-7 are most massive and strongly expanded transversally. Each of these teeth with internal and external tip and concave in the middle.] | |
| I. V. Novikov 1991 (Burtensia) | Translated: [Three large molariforms of approximately same height and at least one incisiform on maxillary bone. Dentary relatively low with four (three) large molariforms the posteriormost of which is slightly larger, and a small one behind it. Molariforms exceed incisiforms significantly in both diameter and height. Their crowns are swollen and the bases are round in cross section and only the upper part is compressed longitudinally. Maximum breadth of molariforms is at the end of the lower third of the total height. Double tips are well developed. Apices are in close lateral distance and there is a concave, sharp ridge between them.] | |
| P. S. Spencer and M. J. Benton 2000 | Medium-sized procolophonines; interorbital depression slight; no lateral process on the quadratojugal; prominent supraorbital ridge formed by the frontal, postfrontal, and parietal; postfrontal fused to parietal; two conical teeth form the anterior part of the maxillary tooth row; a dorsomedially directed intermediate molariform (m7) sometimes forms the end of the dentary tooth row; posteromedial enamel ridge on the lower molariforms truncated dorsally by the distal occlusal basin (emend. from Ivakhnenko, 1979). |
Measurements
No measurements are available
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| Source: c = class, subp = subphylum, uc = unranked clade | |||||
| References: Carroll 1988, Hendy et al. 2009 | |||||
Age range: Olenekian or 251.20000 to 247.20000 Ma
Collections (5 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Smithian | Russian Federation (Orenburg) | T. sp. (196078) | |
| Olenekian | Russian Federation (Kirov) | T. vjatkensis (93104) | |
| Olenekian | Russian Federation (Orenburg) | Burtensia burtensis (94369) T. burtensis (93205) T. sp. (195838) |