Genus
Valid Extinct

Jormungandr

Zietlow et al. 2023

Jormungandr is an extinct genus of mosasaurid squamates from the early Campanian Pierre Shale of North Dakota, United States. The genus contains a single species, J. walhallaensis, known from a nearly-complete skull and partial skeleton. Jormungandr was a medium-sized mosasaur, at around 5–7 metres (16–23 ft) long, and its skeletal anatomy exhibits a mix of features seen in both basal and derived mosasaurines.

Temporal range
Triassic
Jurassic
Cretaceous
Paleogene
Neogene
252 201 145 66 0 Ma
PBDB occurrences
1
Group
Mosasaures
Carnivore aquatic Terrestrial
Jormungandr
click to enlarge
Fossil material of the Jormungandr holotype (Nicknamed Eustace) © Amelia Zietlow · CC BY-SA 4.0 · Wikimedia
Jormungandr
Jormungandr
PBDB ↗ Wikipedia ↗
Classification
Mosasauridae Family
›
Mosasaurinae Subfamily
›
Jormungandr Genus
Fossil sites 1 geolocated sites
Distribution
Top countries
🇺🇸 United States
1
Geological formations
Pierre Shale
1
Temporal distribution
Campanian (83.6–72.2 Ma)
1
Species (1)
Jormungandr walhallaensis 84 Ma
Images 2
Bibliography
Original description
A. R. Zietlow, C. A. Boyd, and N. E. Van Vranken. 2023. Jormungandr walhallaensis: a new mosasaurine (Squamata: Mosasauroidea) from the Pierre Shale Formation (Pembina Member: Middle Campanian) of North Dakota. Bulletin of the American Museum of Natural History 464:1-82 DOI ↗
Bibliography (1)
A. R. Zietlow, C. A. Boyd, and N. E. Van Vranken. 2023. Jormungandr walhallaensis: a new mosasaurine (Squamata: Mosasauroidea) from the Pierre Shale Formation (Pembina Member: Middle Campanian) of North Dakota. Bulletin of the American Museum of Natural History 464:1-82 DOI ↗