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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 ...
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.
This list of the Paleozoic life of Missouri contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Missouri and are between 538.8 and 252.17 million years of age. There is no Permian age rocks on the surface in Missouri, so beware of any fossils identified as such in the state.
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.
Fossil of the Middle-Late Ordovician giant trilobite Isotelus. †Isotelus †Isotelus gigas †Isotelus maximus †Jeffersonia †Kendallina †Kirengella †Kirkella – type locality for genus †Lepidophyllum †Lingula †Liroceras †Matthevia †Maximites †Meristella †Meristina †Metacoceras †Murchisonia – tentative report
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 ...
This article contains a list of fossil-bearing stratigraphic units in the state of Missouri, U.S. Sites. Group or Formation
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 ...