The Dinosaurs - Comptonatus, an iguanodontian dinosaur from the Isle of Wight

Comptonatus, an iguanodontian dinosaur from the Isle of Wight

Comptonatus chasei gen. et sp. nov. (IWCMS 2014.80). Life restoration. Original artwork by John Sibbick.


Jute reptile

The Compton Thunderer


4 metres (13 feet)


Ornithischia Seeley, 1887
Ornithopoda Marsh, 1881
Iguanodontia Baur, 1891
Hadrosauriformes Sereno, 1997

Comptonatus chasei Lockwood, Martill and Maidment 2024


The only known specimen of Comptonatus was found in a plant debris bed on National Trust property to the west of the fault in Compton Bay

Comptonatus chasei differs from all other iguanodontians by possessing the following autapomorphies and unique combination of characters:

  • parietal ‘tubercle’ and step, dorsolateral to ascending process of supraoccipital; the exoccipital bar/bridge overhangs the exoccipital pillar
  • the  basioccipital with thin median ridge in ventral sulcus
  • dentary is straight across the entire ventral margin in lateral view
  • dentary and maxillary crowns both have grooved primary ridges
  • tall neural spines on proximal caudal vertebrae (neural spine > three times height of centrum and approx. four times the height in Cd1)
  • excluding Cd1 and Cd2, both proximal and middle caudal vertebrae have a deep ventral sulcus
  • supraglenoid fossa of the scapula absent
  • coracoid boss on dorsolateral medial surface
  • coracoid has medial cavity buttressed by cornuate ridge
  • prepubic blade markedly dorsoventrally expanded with (reconstructed) ratio of maximum to minimum depth of the prepubic blade c. 2.5
  • boss on medial surface of tibia near dorsal margin

Comptonatus – Wikipedia, the free encyclopedia

LOCKWOOD, J. A. F, MARTILL, D. M. and MAIDMENT, S. C. R. 2024. Comptonatus chasei, a new iguanodontian dinosaur from the Lower Cretaceous Wessex Formation of the Isle of Wight, southern England Journal of Systematic Palaeontology 22.