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Zhangheotheriidae
Taxonomy
Zhangheotheriidae was named by Rougier et al. (2003). It was considered paraphyletic by Bi et al. (2016).
It was assigned to Trechnotheria by Rougier et al. (2003), Gao et al. (2010); and to Spalacotherioidea by Ji et al. (2009), Bi et al. (2016), Zhang et al. (2024).
It was assigned to Trechnotheria by Rougier et al. (2003), Gao et al. (2010); and to Spalacotherioidea by Ji et al. (2009), Bi et al. (2016), Zhang et al. (2024).
Subtaxa
Synonymy list
| Year | Name and author |
|---|---|
| 2003 | Zhangheotheriidae Rougier et al. |
| 2009 | Zhangheotheriidae Ji et al. p. 281 |
| 2010 | Zhangheotheriidae Gao et al. |
| 2016 | Zhangheotheriidae Bi et al. |
| 2024 | Zhangheotheriidae Zhang et al. p. 316 |
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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.
Fm. †Zhangheotheriidae Rougier et al. 2003
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G. †Maotherium Rougier et al. 2003
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†Maotherium asiaticus Ji et al. 2009
†Maotherium sinensis Rougier et al. 2003
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. W. Rougier et al. 2003 | Zhangheotherids include Zhangheotherium and Maotherium, and they are medium sized symmetrodonts. The last uppet and lower premolars are molariform, with at least five cusps although forming a very broad triangle rather than the more acute trigod trigonid of the molars. The upper canines are doublerooted, reduced in size and not trenchant, approximately of the same height except the last incisor. The upper molariforms and last premolar have a welldeveloped, cuspidated, lingual cingulum in Maotherium, but they are short in Zhangheotherium. Large cusp B, cingular cusps e and d are tall and well separated from the rest of the crown. Four or more mental foramina are present. The coronoid process is long and narrow, inclining posteriorly at an angle of approximately 40 degrees. The condylar process is long, dorsally directed, and separated from the coronoid process by a deep notch that extends ventrally to the level of the alveolar margin or below. |
Measurements
No measurements are available
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| Source: c = class, subp = subphylum, uc = unranked clade | |||||
| References: Hopson 1973, Luo et al. 2003, Hendy et al. 2009, Carroll 1988 | |||||
Age range: base of the Aptian to the top of the Early/Lower Aptian or 125.00000 to 122.46000 Ma
Collections (9 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Barremian - Early/Lower Aptian | China (Liaoning) | Anebodon luoi (73438) Mammalia indet. (235272) Maotherium asiaticus (92147) Maotherium sinensis (115646) Zhangheotherium quinquecuspidens (10761 49106) | |
| Barremian - Aptian | Russian Federation (Kemerovo) | Kiyatherium cardiodens (52808) Kiyatherium sp. (167303) | |
| Aptian | Russian Federation (Kemerovo) | Kiyatherium cardiodens (39680) |