Dandakosaurus (meaning "Dandakaranya lizard") is a genus of extinct averostran theropod dinosaur from the Kota Formation, Andhra Pradesh, India. It lived 183 to 175 million years ago from the latest Pliensbachian to the late Toarcian stages of the Early Jurassic. Little is known about the genus and some paleontologists consider it to be a nomen dubium.
| Dandakosaurus | |
|---|---|
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| Dandakosaurus restored as a Megalosauroid | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | Saurischia |
| Clade: | Theropoda |
| Superfamily: | †Megalosauroidea |
| Genus: | †Dandakosaurus Yadagiri, 1982 |
| Species: | †D. indicus
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| Binomial name | |
| †Dandakosaurus indicus Yadagiri, 1982
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Discovery and naming
editThe holotype is partial pubis, GSI 1/54Y/76, discovered in the Kota Formation of India between 1958 and 1961 and was described as an indeterminate carnosaur in 1962.[1][2] Other material referred to the genus include dorsal vertebrae, caudal vertebrae, a tooth and a partial ischium. The type species, D. indicus, was named by Yadagiri in 1982.[3][2]
Description
editThe tooth was described as being recurved and heavily compressed. The distal carina possessed small denticles.[3] The carinae were positioned centrally and the tooth was subsymmetrical labial and distal profiles.[4] The dorsal vertebrae lack pleurocoels and opisthocoelous. The caudal vertebrae bore depressions on the lateral sides. It was amphicoelous and had a keel on its ventral side. It is possible that the vertebrae belong to a sauropodomorph. The obturator fenestra of the pubis is absent, instead being an obturator notch.[5] The pubis is unique in that it points ventrally, unlike the usual forward-facing condition seen in Saurischians, giving it a mesopubic condition.[6]
Classification
editDandakosaurus is currently classified as Averostra incertae sedis, variously suggested to be a basal ceratosaur[7] or basal tetanuran.[2][5][8]
See also
editReferences
edit- ^ Jain, R. and Chowdhury, R. (1962). A new vertebrate fauna from the Early Jurassic of the Deccan, India. Nature. 194(4830): 755-757.
- ^ a b c Olshevsky, G. (1991). "A revision of the parainfraclass Archosauria Cope, 1869, excluding the advanced Crocodylia" (PDF). Mesozoic Meanderings 2. San Diego: 196.
- ^ a b Yadagiri, P. (1982). Osteological studies of a carnosaurian dinosaur from the Lower Jurassic Kota Formation: Andhra Pradesh. Geological Survey of India (Progress Report for Field Season Programme 1981-1982), Regional Palaeontological Laboratories, Southern Region. 7 pp.
- ^ Sharma, Archana; Hendrickx, Christophe; Singh, Sanjay (2023-01-23). "First Theropod Record from the Marine Bathonian of Jaisalmer Basin, Tethyan Coast of Gondwanan India". Rivista Italiana di Paleontologia e Stratigrafia. 129 (1). doi:10.54103/2039-4942/18306. ISSN 2039-4942.
- ^ a b "Megalosauroidea".
- ^ https://www.researchgate.net/publication/380168073_Triassic-Jurassic_dinosaurs_from_India_their_ages_and_palaeobiogeographic_significance [bare URL]
- ^ Reolid, M.; Ruebsam, W.; Benton, M. J. (2022-11-01). "Impact of the Jenkyns Event (early Toarcian) on dinosaurs: Comparison with the Triassic/Jurassic transition". Earth-Science Reviews. 234: 104196. Bibcode:2022ESRv..23404196R. doi:10.1016/j.earscirev.2022.104196. ISSN 0012-8252.
- ^ Molina-Pérez, Rubén; Larramendi, Asier; Atuchin, Andrey; Mazzei, Sante; Connolly, David; Cruz, Gonzalo Ángel Ramírez (2019). Dinosaur Facts and Figures: The Theropods and Other Dinosauriformes. Princeton University Press. ISBN 978-0-691-18031-1. JSTOR j.cdb2hnszb.
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