Platybelodon danovi Borissiak, 1928
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publication ID |
https://doi.org/ 10.4202/app.2011.0009 |
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persistent identifier |
https://treatment.plazi.org/id/BF68F05E-FFA1-F077-0C6A-FA7863A7F9B2 |
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treatment provided by |
Felipe |
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scientific name |
Platybelodon danovi Borissiak, 1928 |
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Platybelodon danovi Borissiak, 1928
Fig. 8 View Fig , Table 2.
Referred material.—HMV1829, a relatively complete, but not yet fully prepared mandible from Citan locality (LX200210); IVPP V18015, the posterior part of a fragmented mandibular symphysis and a fragmented right lower incisor presumably belonging to the same individual, from Ganchliang locality (LX200802).
Diagnosis.—See Borissiak (1929: 22).
Description.—IVPP V18015 ( Fig. 8A View Fig 1 View Fig , A 2 View Fig , B): the fragmented mandibular symphysis is flattened and deeply weathered. There is no transverse ledge developed at the root of the symphysis. The fragmented i2 is flattened and relatively wide, and in cross section exhibits 3–5 layers of dentinal tubules. HMV1829 ( Fig. 8C, D View Fig ): the mandibular symphysis is extremely elongated and, compared to Platybelodon grangeri , relatively narrow. No obvious transverse ledge is developed at the root of the symphysis. The dorsal crest running along the
50
45
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mm
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height 30
Maximal 25 20
15
10 60 80 100 120 140 160 180 200 Maximal width (mm)
Platybelodon dangheensis, Danghe area
Platybelodon sp. , Loperot area, data from Maglio (1969)
Platybelodon danovi, Caucasus area (type), data from Borissiak (1929) Platybelodon danovi, Tongxin area
Platybelodon danovi, LX 200802
Platybelodon grangeri, Tunggur I
Platybelodon grangeri, LX 200002
Platybelodon grangeri, LX 200003
Platybelodon grangeri, Tunggur II
Torynobelodon loomisi , data from Barbour (1929)
lateral border of the symphysis is higher and sharper than in P. grangeri ( Fig. 8D View Fig ). The i2 is flattened, upwardly concave and long, but narrower than in P. grangeri ( Fig. 8C View Fig ). Its anterior edge is somewhat damaged, exposing 3–4 layers of dentinal tubules. The m3 is deeply worn and consists of 4.5 lophids ( Fig. 8D View Fig ), with the posterior cingulid forming a large ring of enamel. While this tooth resembles the m3 of P. grangeri , it is also morphologically somewhat simpler in possessing weakly developed posttrite accessory central conules, as well as in the virtual absence of small enamel conules in the interlophids.
Stratigraphic and geographic range.—Chokrak beds, Kuban region of the North Caucasus; Galata, Varna, Bulgaria; Araph, Turkey; Hongliugou Formation, Ningxia, and Dongxiang Formation, Gansu, both northern China. All of the localities are Middle Miocene ( Borissiak 1929; Beliajeva and Gabunia 1960; Gaziry 1976; Ye and Jia 1986; Guan 1988, 1996; Ye et al. 1989; Markov 2008).
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