Genus
Valid Extinct

Akainacephalus

Wiersma and Irmis 2018

Akainacephalus is a monospecific genus of ankylosaurid dinosaur from southern Utah that lived during the Late Cretaceous in what is now the Horse Mountain Gryposaur Quarry of the Kaiparowits Formation. The type and only species, Akainacephalus johnsoni, is known from the most complete ankylosaur specimen ever discovered from southern Laramidia, including a complete skull, tail club, a number of osteoderms, limb elements and part of its pelvis, among other remains. It was described in 2018 by Jelle P. Wiersma and Randall B. Irmis. It is closely related and shares similar cranial anatomy to Nodocephalosaurus.

Temporal range
Triassic
Jurassic
Cretaceous
Paleogene
Neogene
252 201 145 66 0 Ma
PBDB occurrences
1
Group
Dinosaures
Herbivore Ground dwelling, gregarious Terrestrial
Akainacephalus
click to enlarge
A skeletal mount of the ankylosaur Akainacephalus in a traveling exhibit at the Fernbank Museum in Georgia © A Cynical Idealist · CC BY 4.0 · Wikimedia
PBDB Wikipedia
Classification
Dinosauria Unranked clade
Ornithischia Unranked clade
Parapredentata Unranked clade
Saphornithischia Unranked clade
Prionodontia Unranked clade
Genasauria Unranked clade
Thyreophora Unranked clade
Thyreophoroidea Superfamily
Eurypoda Unranked clade
Ankylosauria Unranked clade
Euankylosauria Unranked clade
Ankylosauridae Family
Ankylosaurinae Subfamily
Ankylosaurini Tribe
Akainacephalus Genus
Measurements
Length
3,8 m
Akainacephalus johnsoni
Mass
500 kg
Akainacephalus johnsoni
Fossil sites 1 geolocated sites
Distribution
Top countries
🇺🇸 United States
1
Geological formations
Temporal distribution
Campanian (83.6–72.2 Ma)
1
Species (1)
Akainacephalus johnsoni 84 Ma
Images 6
Bibliography
Original description
J. P. Wiersma and R. B. Irmis. 2018. A new southern Laramidian ankylosaurid, Akainacephalus johnsoni gen. et sp. nov., from the upper Campanian Kaiparowits Formation of southern Utah, USA. PeerJ 6(e5016) DOI ↗
Bibliography (1)
J. P. Wiersma and R. B. Irmis. 2018. A new southern Laramidian ankylosaurid, Akainacephalus johnsoni gen. et sp. nov., from the upper Campanian Kaiparowits Formation of southern Utah, USA. PeerJ 6(e5016) DOI ↗