Paarthurnax holliensis
- 演化之聲
- Mar 20
- 2 min read
Updated: Apr 9
Age
Cretaceous（Aptian-Albian）
125 - 100.5 Ma
Taxonomy
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Superorder: Crocodylomorpha
Family: Goniopholididae
Genus: Paarthurnax
Species: Paarthurnax holliensis
Morphological description
The body length of Paarthurnax holliensis is estimated to be approximately 3.975 meters based on its skull. The proportions of the skull closely resemble those of extant semi-aquatic crocodilians. It is roughly triangular in outline, with a single external naris, dorsally oriented orbits, and a flattened snout that accounts for about 65% of the total skull length.
The anterior portion of the snout is formed by paired premaxillae. At the junction between the premaxilla and maxilla, there is a distinct notch that accommodates the enlarged fourth dentary tooth. The tip of the snout curves downward, positioning the premaxillary tooth row lower than that of the maxilla.
A fragment of an osteoderm is preserved on the skull. This element is interpreted as part of the dorsal armor. Its surface is covered with numerous pits and bears a spine-like projection, which likely functioned to interlock with adjacent osteoderms.
Etymology
The generic name Paarthurnax is derived from the dragon Paarthurnax in the video game The Elder Scrolls V: Skyrim.
The specific name refers to the Holly Creek Formation, where the species was discovered.
Biological description
Paarthurnax holliensis was discovered in the Holly Creek Formation of southwestern Arkansas, USA. The holotype specimen, TxVP 41881-1, consists of a skull collected in the 1970s. It was initially assigned to Paluxysuchus in a 2021 study of the Holly Creek fauna , but a more detailed reassessment in 2025 established it as a new genus and species.
Phylogenetic analyses indicate that Paarthurnax holliensis forms a sister taxon relationship with Denazinosuchus. This clade is closely related to Anteophthalmosuchus, Deltasuchus, and Paluxysuchus. Although most of these taxa are known from Cretaceous deposits in North America (with Anteophthalmosuchus from Europe), their relationships suggest stronger affinities with European forms than with Jurassic North American taxa. This pattern implies repeated dispersal events between North America and Europe within Goniopholididae.
Paleoenvironmental reconstruction indicates that this species inhabited a coastal plain environment containing lagoons, which were periodically influenced by marine incursions. The associated fauna was diverse, including fishes ranging from freshwater to brackish conditions, as well as turtles, snakes, skinks, dinosaurs, and at least two types of mammals.
（Author: Bai Leng）
References
1. Platt, N. C., Adams, T. L., Brochu, C. A. (2025). A new neosuchian crocodyliform from the Lower Cretaceous (Aptian–Albian) Holly Creek Formation of southwest Arkansas and its implications on the relationships of Goniopholididae. Journal of Vertebrate Paleontology.
2. Suarez, C.A., Frederickson, J., Cifelli, R.L., Pittman, J.G., Nydam, R.L., Hunt-Foster, R.K., Morgan, K. (2021). A new vertebrate fauna from the Lower Cretaceous Holly Creek Formation of the Trinity Group, southwest Arkansas, USA. PeerJ.
+34.09, -93.88
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