Genus: Umoonasaurus KEAR, SCHROEDER & LEE, 2006
Etymology: Antakirinja, indigenous name for the Coober Pedy area, 'Umoona',
and Greek, sauros, "lizard."
Species: demoscyllus KEAR, SCHROEDER & LEE, 2006
Etymology: Greek, demos, "of the people" and Greek, Scyll, a sea monster of classical
mythology; referring to the type locality and purchase of the holotype specimen
by public donations.
Holotype: AM F99374
Locality: Zorba Extension Opal Field, west of Coober Pedy, South Australia State, Australia.
Horizon: Bulldog Shale, Marree Subgroup.
Biostratigraphy: Correlates to the Cyclosporites hughesii, Crybelosporites stratus zones/Odontochitina operculata, Diconodinium davidii, and Muderongia tetracantha zones.
Age: Late Aptian-Early Albian Stage, Early Gallic Subepoch, Late Early Cretaceous Epoch, Late Early Cretaceous.
Material: Skull and skeleton.
Note: Two sections of gastric mass (sample 1, sample 2), total of 60 gastroliths, and associated 17 osteichthyan vertebrae.
Note: Opalized.