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.
= Leptocleidus sp KEAR, 2006b
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.
Referred material:
Locality: Andamooka opal fields, 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: Upper Aptian-Early Albian Stage, Early Gallic Subepoch, Upper Early Cretaceous Epoch, Upper Lower Cretaceous.
Material:
SAM P23841: Skeleton.
Note: Opalized.
Locality: Curdimurka area, Lake Eyre South, 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: Upper Aptian-Early Albian Stage, Early Gallic Subepoch, Upper Early Cretaceous Epoch, Upper Lower Cretaceous.
Material:
SAM P31050: Fragmentary skeleton.
Locality: Neales River Region, Oodnadatta, 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: Upper Aptian-Early Albian Stage, Early Gallic Subepoch, Upper Early Cretaceous Epoch, Upper Lower Cretaceous.
Material:
SAM P410550: Skeleton of a juvenile.
= Leptocleidus sp KEAR, 2006b
Locality: Andamooka, west of Lake Torrens, Eromanga Basin, north-eastern South Australia State, Australia.
Horizon: Bulldog Shale, Marree Subgroup.
Biostratigraphy: C. hughesii and C. striatus zones/O. operculata, D. davidii, and M. tetracantha zones.
Age: Lower Aptian-Lower Albian Stage, Middle Gallic Subepoch, Upper Early Cretaceous Epoch, Early Cretaceous.
Material:
SAM P15980: Fragmentary skeleton of a juvenile.
SAM P39915: Skeleton.
Note: Has a fused terminal 'pygostyle' of the terminal caudal vertebrae, Pathologic?