Yindirtemys suni ( Li and Qiu, 1980 )
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publication ID |
https://doi.org/ 10.26879/649 |
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persistent identifier |
https://treatment.plazi.org/id/1254905A-FF9A-FF9E-4373-FA9953CAF9F8 |
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treatment provided by |
Felipe |
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scientific name |
Yindirtemys suni ( Li and Qiu, 1980 ) |
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Yindirtemys suni ( Li and Qiu, 1980) .
Figure 6.1-6.12 View FIGURE 6
1980 Tataromyssuni Li and Qiu, p. 205-206, 212, fig. 7; pl. I, fig. 3.
1981 Tataromyssuni Wang, Chang, Meng, and Chen, p. 27, 29, 34.
1988 Tataromyssuni Qiu and Gu, p. 204-206, 211, pl. II, figs 1, 2, 3, 4, 10.
1994 Yindirtemys suni Wang , p. 37.
1997 Yindirtemys suni Wang , p. 35-37.
2007 Yindirtemys deflexus (pro-parte) Schmidt-Kittler, Vianey-Liaud, and Marivaux, p. 191- 201.
2007 Yindirtemys suni Daxner-Höck and Badamgarav , p. 16, 18.
Holotype. Right maxilla with P4-M3. Li and Qiu, (1980: fig. 7; pl. I, fig. 3).
Type Locality. Xiejia (Xining Basin, Qinghai, China).
Material and Measurements. Table 4.
Stratigraphic Range in Mongolia. The Oligocene-Miocene transition (biozone C1-D) and early Miocene (biozone D); Hsanda Gol and Loh Fms.
Geographic Distribution. Valley of Lakes ( Mongolia), Inner Mongolia ( China), Qinghai and Gansu province ( China).
Description. The description is based on the material of Yindirtemys suni from the locality Hotuliin Teeg (HTE-014-018) in Mongolia.
P4. The labial anteroloph is medium long in one of two specimens or absent in the other. The lingual anteroloph is absent. The labial posteroloph is medium long. The lingual posteroloph is short. The lingual crest of the metaloph is long and connected to the posteroloph ( Figure 6.8 View FIGURE 6 ).
M2. The labial anteroloph is medium long (one out of two specimens) or long and connected to the paracone (one out of two). The lingual anteroloph is absent. The protoloph is anterior to the protocone. In one specimen the protoloph is transversely connected, and in the other one it is proverse. In one out of two, there is an incipient crochet; in the remaining one the anticrochet is connected to the posteroloph. In all the specimens the metaloph is anterior with respect to the hypocone and is connected transversely to it ( Figure 6.8 View FIGURE 6 -9).
M3. The labial anteroloph is long and connected to the paracone (one out of four specimens) or it is medium long (three out of four). The lingual anteroloph is absent. The anterior groove is absent in three and shallow in the remaining specimen. The protoloph is always anterior to the protocone, and it runs transversely (three out of four) or proverse (one out of four). The sinus is retroverse (three out of four) or transverse (one out of four) and always deep. The metaloph is anterior to the hypocone in two out of four teeth and transversal in the remaining two. It is transversely directed in two and proverse in two specimens ( Figure 6.10 View FIGURE 6 -11).
m1. The anterior cingulid is short (two out of three specimens) or long (one out of three). The metalophid I is well connected to the protoconid. In all the specimens the mesolophid is connected to the metaconid. The sinusid is M-shaped. The hypoconulid is present. The hypolophid is connected to the anterior arm of the hypoconid ( Figure 6.12 View FIGURE 6 ).
m2. The anterior cingulid is long. The metalophid I is well connected to the protoconid. The mesolophid is long and connected to the metaconid in one specimen and it is medium in the remaining one. The sinusid is M-shaped. The hypoconulid is present. In all specimens the hypolophid is connected to the anterior arm of the hypoconid (See Figure 6.12 View FIGURE 6 ).
m3. The metalophid I is well connected to the protoconid. The mesolophid is short, the sinusid Mshaped. The hypoconulid is always present. The hypolophid is connected to the anterior arm of the hypoconid ( Figure 6.12 View FIGURE 6 ).
Remarks. Schmidt-Kittler et al. (2007) assigned all large-sized Yindirtemys specimens from Mongolia to Y. deflexus. Since new and rich fossil material from different localities is accessible to us, we are able to differ Y. suni from Y. deflexus.
Yindirtemys suni from the Mongolian localities differs from Y. deflexus by larger size of teeth, large and inflated jaws and bones. Upper molars with less tendency to develop additional crests (simpler pattern), and bulky and globular P4. In the lower molars, the protoconid and hypoconid are shorter than in Y. deflexus (see Appendix 1).
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