Topic
Dvinosaurus
About: Dvinosaurus is a research topic. Over the lifetime, 3 publications have been published within this topic receiving 69 citations.
Papers
TL;DR: In this article, a new temnospondyl from the Early Triassic Buena Vista Formation (Parana Basin) in Uruguay is described, represented by a skull table fragment which includes the left orbit, and, although fairly incomplete, shows close affinities with the basal (Dvinosaurus + Tupilakosauridae).
Abstract: A new temnospondyl from the Early Triassic Buena Vista Formation (Parana Basin) in Uruguay is described. The specimen is represented by a skull table fragment which includes the left orbit, and, although fairly incomplete, shows close affinities with the basal temnospondyl clade (Dvinosaurus + Tupilakosauridae). Previously, members of this clade were only known from Upper Permian and Lower Triassic deposits from the Northern Hemisphere. The new specimen described herein together with a recent record from the Lower Triassic of South Africa (Karoo Basin), support the hypothesis of an invasion of members of the basal (Dvinosaurus + Tupilakosauridae) clade into Gondwana as early as the Late Permian.
22 citations
TL;DR: Microanatomical and morphological features indicate that D. campbelli was an ambush feeder (using concealment during hunting) and the neotenic nature of D.campbelli is confirmed by the presence of unresorbed cartilage in the skeletal elements of large-sized forms.
Abstract: This study describes the microanatomical and histological structure of the femur and hypocentra of the neotenic temnospondyl amphibian Dvinosaurus campbelli from the Late Permian locality Gorokhovets, Vladimir Region (Upper Vyatkian Substage, subzone Chroniosuchus paradoxus of the Scutosaurus karpinskii zone). The femur of D. campbelli is characterized by a “pachyosteous” structure (dense thick periosteal cortex in the diaphysis) and a large number of growth marks (about 57); the hypocentrum has an “osteoporotic” structure. The neotenic nature of D. campbelli is confirmed by the presence of unresorbed cartilage in the skeletal elements of large-sized forms. Microanatomical and morphological features indicate that D. campbelli was an ambush feeder (using concealment during hunting).
3 citations
TL;DR: The skeletal material of Kotlassia prima, a primitive tetrapod from the Upper Permian of the North Dvina River in northern Russia, is described and figured in detail as discussed by the authors.
Abstract: The skeletal material of Kotlassia prima , a primitive tetrapod from the Upper Permian of the North Dvina River in northern Russia, is described and figured in detail. The various specimens permit a nearly complete description except for the feet. Karpinskiosaurus secundus is a synonym of Kotlassia prima . The animal is definitely amphibian in nature although it may be regarded as a relict of the reptilian ancestors of the Reptilia. Kotlassia was as an adult a terrestrial form, in contrast to the contemporary Dvinosaurus. Seymouria may be an amphibian of the same kind.
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2020 | 1 |
| 2000 | 1 |
| 1944 | 1 |