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Zhangheotherium quinquecuspidens
Taxonomy
Zhangheotherium quinquecuspidens was named by Hu et al. (1997). Its type specimen is IVPP V7466, a partial skeleton (partial skull and most of postcranial skeleton), and it is a compression fossil. Its type locality is Zhangheotherium type, Jianshangou Valley, which is in a Barremian/Aptian lacustrine shale in the Yixian Formation of China. It is the type species of Zhangheotherium.
Synonymy list
| Year | Name and author |
|---|---|
| 1997 | Zhangheotherium quinquecuspidens Hu et al. pp. 137-140 figs. 1-4 |
| 2004 | Zhangheotherium quinquecuspidens Kielan-Jaworowska et al. pp. 345, 368 |
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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.
†Zhangheotherium quinquecuspidens Hu et al. 1997
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| Y. Hu et al. 1997 | A spalacotheriid symmetrodont (Fig. 2) with the dental formula 3×1×2×5/3×1×2×6; differing from all other known symmetrodonts in having a hypertrophied cusp B9 between the main cusp A and the stylocone (cusp B) (Fig. 2); distinguishable from other spalacotheriids in the conical shape of the main cusps and the lack of lingual and labial cingulids on the lower molars; distinctive from Spalacotherium in having more robust and rounded main cusps that lack connecting cristae; unique among early mammals in having fused sternebrae, and a posteriorly expanded xiphoid process. |
Measurements
No measurements are available
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| Source: g = genus, c = class, subp = subphylum, uc = unranked clade | |||||
| References: Luo et al. 2003, Hopson 1973, Hendy et al. 2009, Ji et al. 2002, Carroll 1988 | |||||
Age range: base of the Late/Upper Barremian to the top of the Early/Lower Aptian or 130.00000 to 122.46000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Barremian - Early/Lower Aptian | China (Liaoning) | Zhangheotherium quinquecuspidens (10761 type locality: 49106) |