Jaklapallisaurus Temporal range: Late Triassic, | |
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Scientific classification ![]() | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Clade: | Dinosauria |
Clade: | Saurischia |
Clade: | † Sauropodomorpha |
Clade: | † Unaysauridae |
Genus: | † Jaklapallisaurus Novas et al. 2011 |
Species: | †J. asymmetricus |
Binomial name | |
†Jaklapallisaurus asymmetricus Novas et al. 2011 | |
Jaklapallisaurus is a genus of unaysaurid sauropodomorph dinosaur. It lived during the Late Triassic period (late Norian to earliest Rhaetian) in what is now Telangana, central India.The genus is monotypic, only including the species Jaklapallisaurus asymmetricus.
The Jaklapallisaurus holotype specimen, ISI R274, consists of postcranial material which was collected from the Upper Maleri Formation (late Norian–earliest Rhaetian) of the Pranhita–Godavari Basin. The specimen includes a probable anterior dorsal vertebra, an anterior caudal vertebra, and right distal end of femur, tibia, astragalus, metatarsals I IV, and pedal phalanges I-1 and II-1. It was first named by Fernando E. Novas, Martin D. Ezcurra, Sankar Chatterjee and Tharavat S. Kutty in 2011. The type species is Jaklapallisaurus asymmetrica. ISI R279, a partially complete right femur which was collected from the Lower Dharmaram Formation (latest Norian–Rhaetian) was originally referred to Jaklapallisaurus. [1] However, later research proved that the referral is based on weak grounds, and the presence of the species in that stratigraphic unit should be based on a more taxonomically informative specimen. [2]
The generic name is derived from the Indian town of Jaklapalli which is close to the type locality. The specific name refers to the highly asymmetrical astragalus of this species in distal view.
In 2023, the ending of the Latinized specific epithet was changed from the female "asymmetrica" to the masculine "asymmetricus" because the ending of the Latinized genus Jakalapallisaurus is masculine. This modification is based on the Article 34 of the International Code of Zoological Nomenclature. [2] The Jaklapallisaurus fossil material was found along with the guaibasaurid sauropodomorph Nambalia and two basal dinosauriforms. [2]
In their 2023 description of the osteology of Jaklapallisaurus, Ezcurra et al. performed a phylogenetic analysis of bagualosaurians, recovering it as the sister taxon to Macrocollum , in a clade also containing Unaysaurus , called Unaysauridae. The results of their analysis are shown in the cladogram below: [2]
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Sauropodomorpha is an extinct clade of long-necked, herbivorous, saurischian dinosaurs that includes the sauropods and their ancestral relatives. Sauropods generally grew to very large sizes, had long necks and tails, were quadrupedal, and became the largest animals to ever walk the Earth. The prosauropods, which preceded the sauropods, were smaller and were often able to walk on two legs. The sauropodomorphs were the dominant terrestrial herbivores throughout much of the Mesozoic Era, from their origins in the Late Triassic until their decline and extinction at the end of the Cretaceous.
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Saturnalia is an extinct genus of basal sauropodomorph dinosaur known from the Late Triassic Santa Maria Formation of Rio Grande do Sul, southern Brazil. It is one of the earliest known dinosaurs.
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Sankar Chatterjee is a paleontologist, the Paul W. Horn Professor of Geosciences at Texas Tech University and Curator of Paleontology at the Museum of Texas Tech University. He earned his Ph.D. from the University of Calcutta in 1970 and was a Post-doctoral Fellow at the Smithsonian Institution from 1977-1978.
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Alwalkeria is a genus partly based on basal saurischian dinosaur remains from the Late Triassic, living in India.
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The Upper Maleri Formation is a sedimentary rock formation found in Telangana, India. It is one of the formations of the Pranhita–Godavari Basin. It is of late Norian and possibly earliest Rhaetian ages, and is notable for its fossils of early dinosaurs.
The Lower Maleri Formation is a sedimentary rock formation found in Andhra Pradesh and Telangana, India. It is the lowermost member of the Pranhita–Godavari Basin. It is of late Carnian to early Norian age, and is notable for its fossils of early dinosaurs, including the basal saurischian Alwalkeria.
The Lower Dharmaram Formation is a sedimentary rock formation found in Andhra Pradesh, India. It is one of the formations of the Pranhita–Godavari Basin. It is of latest Norian and Rhaetian ages, and is notable for its fossils of early dinosaurs.
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