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Symmetrodonta (symmetrodont)
Taxonomy
Symmetrodonta was named by Simpson (1925).
It was reranked as the unranked clade Symmetrodonta by McKenna (1975), Averianov (2002); it was reranked as the infraclass Symmetrodonta by Averianov and Lopatin (2011).
It was assigned to Allotheria by Hay (1930); to Mammalia by Simpson (1928), Olson (1966); to Trechnotheria by McKenna (1975), Prothero (1981); to Yangotheria by Chow and Rich (1982); to Trituberculata by Carroll (1988); to Pantotheria by Cassiliano and Clemens (1979), Bonaparte (1990); to Theria by Simpson (1929), Hu et al. (1997); to Holotheria by Averianov (2002); and to Acrotheria by Averianov and Lopatin (2011).
It was reranked as the unranked clade Symmetrodonta by McKenna (1975), Averianov (2002); it was reranked as the infraclass Symmetrodonta by Averianov and Lopatin (2011).
It was assigned to Allotheria by Hay (1930); to Mammalia by Simpson (1928), Olson (1966); to Trechnotheria by McKenna (1975), Prothero (1981); to Yangotheria by Chow and Rich (1982); to Trituberculata by Carroll (1988); to Pantotheria by Cassiliano and Clemens (1979), Bonaparte (1990); to Theria by Simpson (1929), Hu et al. (1997); to Holotheria by Averianov (2002); and to Acrotheria by Averianov and Lopatin (2011).
Synonymy list
| Year | Name and author |
|---|---|
| 1925 | Symmetrodonta Simpson |
| 1928 | Symmetrodonta Simpson p. 97 |
| 1929 | Symmetrodonta Simpson p. 38 |
| 1930 | Symmetrodonta Hay p. 370 |
| 1966 | Symmetrodonta Olson p. 302 |
| 1975 | Symmetrodonta McKenna p. 40 |
| 1979 | Symmetrodonta Cassiliano and Clemens p. 151 |
| 1981 | Symmetrodonta Prothero p. 321 |
| 1982 | Symmetrodonta Chow and Rich p. 129 |
| 1988 | Symmetrodonta Carroll |
| 1990 | Symmetrodonta Bonaparte p. 66 |
| 1997 | Symmetrodonta Hu et al. p. 137 |
| 2002 | Symmetrodonta Averianov p. 714 |
| 2011 | Symmetrodonta Averianov and Lopatin p. 34 |
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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.
Or. †Symmetrodonta Simpson 1925 [symmetrodont]
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Fm. †Amphidontidae Simpson 1925
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Fm. †Woutersiidae Sigogneau-Russell and Hahn 1995
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G. †Woutersia Sigogneau-Russell 1983
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†Woutersia butleri Sigogneau-Russell and Hahn 1995
†Woutersia mirabilis Sigogneau-Russell 1983
Invalid names: Barbereniidae Bonaparte 1990 [empty], Spalacotheriida Prothero 1981 [empty], Tinodontida Prothero 1981 [empty]
Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: c = class, subp = subphylum, p = phylum, uc = unranked clade | |||||
| References: Carroll 1988, Luo et al. 2003, Hopson 1973, Kiessling 2004 | |||||
Age range: base of the Rhaetian to the top of the Maastrichtian or 205.70000 to 66.00000 Ma
Collections (25 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Rhaetian | France (Lorraine) | Woutersia mirabilis (92109) Woutersia mirabilis, Woutersia butleri (36106) | |
| Hettangian - Sinemurian | United Kingdom (Wales) | Symmetrodonta indet. (45919) | |
| Toarcian - Aalenian | India (Andhra Pradesh) | Trishulotherium kotaensis, Nakunodon paikasiensis (39673) | |
| Kimmeridgian - Tithonian | USA (Wyoming) | Amphidon superstes, Amphidon aequicrurius (12816) Symmetrodonta indet. (55333) | |
| Late/Upper Kimmeridgian | Portugal (Centro) | Symmetrodonta indet. (49304 69708) | |
| Early/Lower Tithonian | USA (Colorado) | Symmetrodonta indet. (71476) | |
| Tithonian | USA (Colorado) | Symmetrodonta indet. (53040) | |
| Tithonian | USA (Utah) | Symmetrodonta indet. (57913) | |
| Late/Upper Tithonian - Early/Lower Berriasian | Morocco (Figuig) | Symmetrodonta indet. (204918 204936 204990) | |
| Early/Lower Barremian | Spain (Aragón) | Symmetrodonta indet. (28196) | |
| Late/Upper Barremian - Early/Lower Aptian | Germany (North Rhine-Westphalia) | Symmetrodonta indet. (152548) | |
| Barremian - Aptian | Russian Federation (Kemerovo) | Amphidontidae indet. (52808) | |
| Barremian - Aptian | Russian Federation (Krasnoyarsk) | Amphidontidae indet. (206601 206602) | |
| Aptian | Russian Federation (Kemerovo) | Acinacodus tagaricus (39680) | |
| Middle Turonian | USA (Utah) | Symmetrodonta indet. (14416) | |
| Middle Turonian - Late/Upper Turonian | USA (Utah) | Symmetrodonta indet. (14414) | |
| Early/Lower Campanian | USA (Utah) | Symmetrodonta indet. (75839) | |
| Late/Upper Maastrichtian | India (Maharashtra) | Symmetrodonta indet. (58102) | |
| Maastrichtian | Portugal (Coimbra) | Symmetrodonta indet. (49276) |