Strenulagus solaris Lopatin and Averianov, 2006
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publication ID |
https://doi.org/ 10.4202/app.00292.2016 |
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persistent identifier |
https://treatment.plazi.org/id/03E687D4-FFF6-FFC0-FFE9-7802FEB923C6 |
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treatment provided by |
Felipe |
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scientific name |
Strenulagus solaris Lopatin and Averianov, 2006 |
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Strenulagus solaris Lopatin and Averianov, 2006
Fig. 7 View Fig .
Material.—Right m1 (IVPP V20256.1), fragment of left M2 (IVPP V20264), left calcaneus (IVPP V20256.2), from Wulanhuxiu, Erlian Basin, Nei Mongol, China, horizon 4, Irdinmanhan (middle Eocene).
Description.—The M2 (V20264) is partly damaged and worn. The overall dental structure and size is consistent with the morphology and measurements of M2 of Strenulagus solaris from the Erenhot area ( Fostowicz-Frelik et al. 2015a). The total tooth height is 4.24 mm and the dimensions of the crown are length 1.37 mm and width 2.5 mm. The occlusal surface is oval and almost totally obliterated, apart from the buccally situated remnants of the groove dividing the trigon from the hypoconal shelf.
The m1 (V20256.1) also shows morphology typical of this species (see Fostowicz-Frelik et al. 2015a: fig. 6). The total length of the occlusal surface is 1.93 mm. The crown is moderately high (crown height is 2.80 mm at 5.76 mm of the total tooth height) and the roots fused, displaying a common dental chamber ( Fig. 7 View Fig ). The trigonid (1.86 mm in width) is elliptical and shorter than the talonid (1.43 mm in width), which is subrectangular in outline. The metaconid is sharp and higher than the protoconid. The occlusal surface of the talonid is much lower than that of the trigonid.
A right calcaneus (V20256.2) with a damaged sustentaculum tali was found together with the right m1 (V20256.1), and the same species attribution is presumed for the bone. The calcaneus total length is 8.1 mm, closely matching the size of the bones from the Irdin Manha Escarpment ( Fostowicz-Frelik et al. 2015a: fig. 7, table 5) assigned to Strenulagus solaris . The bone is slender and the length of the calcaneal body (3.1 mm) is only slightly shorter than the tuber calcanei (3.9 mm). The ratio of the length of the calcaneal body to the length of the calcaneal tuber (0.80) resembles that of the specimen from the Irdin Manha Escarpment (0.75). Also, the length of the calcaneal eminence bearing the calcaneo-astragalar facet and the calcaneo-fibular facet is relatively short, again resembling the specimens from Irdin Manha. Both apertures of the calcaneal canal are well developed, similar to those of Ochotona ( Bleefeld and Bock 2002) rather than those of leporids, in which they are much smaller ( Fostowicz-Frelik 2007: fig. 12).
Stratigraphic and geographic range.—Middle Eocene, Khaychin Formation, Mongolia and Irdin Manha Formation, Nei Mongol, China.
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