Scleromochlus

Scleromochlus is an extinct, small-bodied archosauriform from Late Triassic Scotland, known from fragmentary fossils. Its evolutionary position is debated, especially its possible close relationship to pterosaurs.

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Archosaur: A member of the reptile group that includes crocodilians, dinosaurs, and birds. Scleromochlus belongs to the broader archosaur lineage, though its exact placement within it remains disputed.
Cursorial locomotion: Locomotion adapted for running, usually involving long limbs and efficient forward movement. Scleromochlus’s elongated hind limbs have supported reconstructions of a fast-running animal.
Lossiemouth Sandstone: A Late Triassic geological formation in northeastern Scotland containing vertebrate fossils. Scleromochlus fossils come from this formation near Elgin.
Arthur Smith Woodward: A British vertebrate paleontologist who described many fossil fishes and reptiles. Woodward formally described Scleromochlus in 1907.
Pterosauria: The clade containing pterosaurs, the first vertebrates known to have evolved powered flight. Whether Scleromochlus lies near this clade is a central dispute about its evolutionary position.
Archosauriformes: A group of reptiles encompassing archosaurs and their close extinct relatives. This broader grouping captures Scleromochlus across competing interpretations of its narrower affinities.
Saltation: A form of locomotion in which an animal moves by repeated leaps or hops. Some interpretations of its body proportions suggest hopping rather than ordinary running.
Elgin, Scotland: A town in northeastern Scotland near important Late Triassic fossil localities. The fossil material that established Scleromochlus was collected from the Elgin area.
Michael Benton: A British paleontologist known for research on vertebrate evolution and Triassic life. Benton’s work helped reassess Scleromochlus’s anatomy and its possible pterosaur relationship.
Dinosauromorpha: A group of archosaurs that includes dinosaurs and their closest extinct relatives. Some phylogenetic analyses place Scleromochlus among early dinosauromorphs instead of near pterosaurs.