Geological Studies Unit, Indian Statistical Institute, Kolkata, West Bengal, India.
PeerJ. 2023 Mar 6;11:e14865. doi: 10.7717/peerj.14865. eCollection 2023.
A new, partially preserved skull of chigutisaurid amphibian (temnospondyli) has been reported for the first time from the Late Triassic Tiki Formation of India. Chigutisaurids are now known to occur in Australia's Early and Late Triassic, the Late Triassic in India, Argentina, and Brazil, the Jurassic of South Africa and Australia, and the Cretaceous of Australia. In India, the first appearance of chigutisaurids marks the Carnian-middle Carnian/Norian Boundary. This work also attempts to correlate, again for the first time, the advent of chigutisaurids and the occurrence of Carnian Pluvial Episodes (CPE) in the Late Triassic Maleri and Tiki Formation of Central India. The new specimen belongs to the genus prevalent in the Late Triassic Maleri Formation occurring 700 km south. However, the chigutisaurid specimen recovered from the Tiki Formation is a new species when compared to that of the Maleri Formation. It has the presence of an inward curved process of the quadratojugal as opposed to the straight downward trending process of the quadratojugal, the presence of vomerine foramen, shorter and wider interpterygoid vacuities, wider subtemporal vacuities, and the base of the interpterygoid vacuities at the same level with the base of the subtemporal vacuity. It proves that the Tiki Formation is coeval with the Lower Maleri Formation and a part of Upper Maleri.
一种新的、部分保存的迷齿两栖动物（坚头类）头骨首次报道于印度晚三叠世提基组。迷齿两栖动物现在已知分布于澳大利亚的早三叠世和晚三叠世、印度、阿根廷和巴西的晚三叠世、南非和澳大利亚的侏罗纪以及澳大利亚的白垩纪。在印度，迷齿两栖动物的首次出现标志着卡洛维阶中期-诺利阶界限。这项工作还试图首次将迷齿两栖动物的出现与印度中部晚三叠世马里里组和提基组的卡尼期洪积事件（CPE）联系起来。新标本属于在晚三叠世马里里组普遍存在的属，比南 700 公里处的提基组更为常见。然而，与马里里组相比，从提基组中回收的迷齿两栖动物标本是一个新物种。它的方后关节向内弯曲，而不是直向下的趋势，有犁骨孔，较短和较宽的间翼状骨空隙，较宽的颞下空隙，以及间翼状骨空隙的基部与颞下空隙的基部处于同一水平。这证明提基组与下马里里组同期，是上马里里组的一部分。
