Abstract
This paper reports the find of a new non-mammalian cynodont from the Lower Triassic Panchet Formation of the Damodar valley, West Bengal, India. The fossil, recovered from a clay pellet rich calcareous sandstone bed, is a part of left lower jaw having five post canines that are damaged to various extents. A combination of mammal-like advanced characters such as much enlarged dentary, reduced post dentary bones, high coronoid process, large masseteric fossa, each post canine with a large central cusp flanked by a distal and a mesial accessory cusps with two additional lingually positioned cingular cusps, incipient root division and clearly demarcated crown-root juncture prompted to erect a new taxon Panchetocynodon damodarensis gen. et sp. nov.
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References
Battail, B. (1991) Les cynodontes (Reptilia, Therapsida): une phylogenie. Bull. Mus. National d× histoire Naturelle, Series 4, 13c(4), pp.17–105.
Benton, M.J. (1997) Vertebrate Palaeontology. Chapman & Hall, 2nd Edition, 452p.
Bonaparte, J.F., Martinelli, A.G., Schultz, C.L. and Rubert, R. (2003) The sister group of mammals: small cynodonts from the Late Triassic of Southern Brazil. Revista Brasileira de paleontologia, v.5, pp.5–27.
Botha, J., Abdala, F. and Smith, R. (2007) The oldest cynodont: new clues on the origin and early diversification of the cynodontia. Zoological Jour. Linnean Soc., v.149, pp.477–492.
Dasgupta, H.C. (1922) Notes on the Panchet Reptile. Sir Asutosh Mukherjee Silver Jubilee Volumes (Published by Calcutta University), v.2, pp.237–241.
Dasgupta, H.C. (1926) Palaeontological notes on the Panchet beds at Deoli, near Assansol. Jour. Asiatic Soc., Bengal, v.22, pp.215–217.
Carroll, R.L. (1988) Vertebrate Palaeontology and Evolution. Publisher W.H. Freeman & Co., 698p.
Crompton, A.W. and Jenkins, F.A. Jr. (1979) Origin of mammals. In: J.A. Lillegraven, Z.K. Jaworowska and A. Clemens (Ed.), Mesozoic Mammals: the first two-third of the mammalian history. Berkeley, University, California Press.
Crompton, A.W. and Luo, Z.X. (1993) Relationships of the Liassic mammals Sinoconodon, Morganucodon and Dinnetherium. In: F.S. Szalay, M.J. Novacek and M.C. McKenna (Eds.), Mammal Phylogeny (Volume I) Mesozoic differentiation, multituberculates, monotremes, early therians and marsupials. Springer-Verlag, New York, pp.30–44.
Groenewald, G.H. and Kitching, J.W. (1995) Biostratigraphy of the Lystrosaurus Assemblage Zone. South African Committee for Stratigraphy and Biostratigraphy Series 1, pp.35–39.
Gupta, A. (2007) Fish remains from the Panchet formation, W.B. — New Find. News Geol. Surv. India, (CHQ), v.38(1), pp.26–27.
Gupta, A. (2009) Ichthyofauna of the Lower Triassic Panchet Formation, Damodar valley basin, West Bengal, and its implications. Indian Jour. Geosci., v.63(3), pp.275–286.
Huxley, T.H. (1865) On a collection of vertebrate fossil from Panchet rocks, Raniganj coalfield. Palaeontologica Indica Series, v.4,1(1), pp.2–24.
Kemp, T.S. (1979) The primitive cynodont Procynosuchus: functional anatomy of the skull and relationships. Phil. Trans. Royal Soc. London, v.B285, pp.73–122.
Lucas, S.G. (1998) Global Triassic tetrapod biostratigraphy and biochronology. Palaeogeo., Palaeoclimat., Palaeoeco., v.143, pp.345–382.
Lucas, S.G. (1999) A tetrapod based Triassic Time Scale. Albertiana, v.21(3), pp.1–8.
Lydekker, R. (1881) Note on some Gondwana vertebrates. Rec. Geol. Surv. India, v.14, pp.174–178.
Martinella, A.G., Bonaparte, J.F., Schultz, C.L. and Robert, R. (2005) A new tritheledontid (Therapsida, Eucynodontia) from the Late Triassic of Rio Grande do Sul (Brazil) cynodonts. Ameghiana, v.42(1), pp.191–208.
Martinez, R.N., May, C.L. and Forster, C.A. (1996) A new carnivorous cynodont from the Ischiguslasto Formation (Late Triassic, Argentina) with comments on eucynodont phylogeny. Jour. Vertebrate Palaeont., v.16, pp.271–284.
Nath, T.T. and Yadagiri, P. (2007) A new mammal like reptile (Cynodonta) from the Upper Triassic Maleri Formation of Pranhita-Godavari Valley, Andhra Pradesh. Jour. Geol. Soc. India, v.69, pp.57–60.
Osborn, H.F. (1903) On the primary division of the Reptilia, into two subclasses, Synopsida and Diapsida. Science, v.17, pp.275–276.
Owen, R. (1861) Palaeontology or a systematic summary of extinct animals and their geological remains. Edinburgh: A & C, 2nd Edn., Black. pp.270–275.
Romer, A.S. (1970) The Chanares (Argentina) Triassic reptile fauna. VI. A cynodont with an incipient squamosal — dentary articulation. Breviora, v.344, pp.1–8.
Rubidge, B.S. (1995) Biostratigraphy of the Baeufort Group (Karoo Supergroup). Pectoria: South African Committee for Stratigraphy, Biostratigraphic series 1.
Satsangi, P.P. (1987) The vertebrate faunas of the Permian and Lower Triassic sequence of India. In: Mesozoic Gondwana Vertebrates. Geol. Surv. India Spec. Publ. v.11, pp.165–178.
Shapiro, M.D. and Jenkins, F.A. Jr. (2001) A cynodont from the Upper Triassic of East Greenland: tooth replacement and double-rootedness. Bull. Museum Comparative Zoology, Harvard University, v.156, pp.49–58.
Shubin, N.H., Crompton, A.W., Sues, H.D. and Olsen, P.E. (1991) New fossil evidence on the sister-group of mammals and early Mesozoic faunal distribution. Science, v.251, pp.1063–1065.
Sues, H.D. and Boy, J.A. (1988) A procynosuchid cynodont from central Europe. Nature, v.331, pp.523–524.
Tatarinov, L.P. (2004) Late Permian theriodonts (Reptilia) from the Gorokhovetz locality (Russia, Vladimir region). Palaeontological Jour., v.38, pp.81–83.
Tripathi, C. (1962) On the remains of Lystrosaurus from the Panchet rocks of Raniganj coalfield. Rec. Geol. Surv. India, v.89(2), pp.407–419.
Tripathi, C. and Satsangi, P.P. (1963) Lystrosaurus fauna from Panchet Series of Raniganj coalfield. Palaeontologica Indica (N.S.), v.37, pp.1–53.
Wilford, J.N. (1982) Standing there at a turning point in evolution; is a reptile on the verge of being a mammal? The New York Times, Nov.2.
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Das, D.P., Gupta, A. New cynodont record from the lower Triassic Panchet Formation, Damodar valley. J Geol Soc India 79, 175–180 (2012). https://doi.org/10.1007/s12594-012-0022-2
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DOI: https://doi.org/10.1007/s12594-012-0022-2