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In 2024, Flannery et al. described Opalios splendens as a new genus and species of early monotreme based on these fossil remains. They erected the new monotypic family Opalionidae within the Ornithorhynchoidea —the superfamily also containing modern echidnas and platypus —to house Opalios due to its similarity to both of these extant lineages.
Ornithorhynchoidea is a superfamily of mammals containing the only living monotremes, the platypus and the echidnas, as well as their closest fossil relatives, to the exclusion of more primitive fossil monotremes of uncertain affinity.
The bones were the disarticulated remains of bears, deer, mice, and a kind of eastern wood rat not currently found in the area of the fossil discovery. [17] More recently, in 1989, the Pennsylvanian sea lily, Delocrinus missouriensis, was designated the Missouri state fossil. In 2004, Hypsibema missouriensis was designated the state dinosaur ...
The complete skull is one of the most significant finds of its kind, say researchers.
Hypsibema missouriensis (/ ˌ h ɪ p s ɪ ˈ b iː m ə m ɪ ˌ z ʊər i ˈ ɛ n s ɪ s /; [1] originally Neosaurus missouriensis, first renamed to Parrosaurus missouriensis, [1] [2] also spelled Hypsibema missouriense [3]) is a species of plant-eating dinosaur in the genus Hypsibema, and the state dinosaur of the U.S. state Missouri.
An amateur fossil hunter has uncovered a 7 ft-long, fully intact mammoth tusk in a creek near a Mississippi river stream, a world-first discovery that sheds more light on the region’s ecology ...
Attenborough’s long-beaked echidna, which was thought to be extinct, has stunned scientists after being filmed in a tropical forest in Indonesia for the first time.. The egg-laying mammal, named ...
It has been theorized that the loss of teeth in the platypus was a geologically recent event, occurring only in the Pleistocene (after over 95 million years of tooth presence in the ornithorhynchid lineage) after the migration of the rakali (Hydromys chrysogaster), a large semiaquatic rodent, to Australia. Competition between the rakali and ...