| 词条 | Scleromochlus |
| 释义 |
| fossil_range = Late Triassic, {{fossil_range|Carnian}} | image = Cast of Scleromochlus taylori - Pterosaurs Flight in the Age of Dinosaurs.jpg | image_caption = Cast of the holotype | genus = Scleromochlus | display_parents = 4 | grandparent_authority = Huene, 1914 | parent_authority = Woodward, 1907 | authority = Woodward, 1907 | species = taylori }} Scleromochlus (Greek for "hard fulcrum") is an extinct genus of small avemetatarsalians from the Late Triassic period. DescriptionScleromochlus taylori was about 181 mm (about 7.1 inches) long, with long hind legs; it may have been capable of four-legged and two-legged locomotion. Most recent studies about its gait suggest that it engaged in kangaroo- or springhare-like plantigrade hopping;[1][2][3] if Scleromochlus is indeed related to pterosaurs, this may offer insight as to how the latter evolved, since early pterosaurs also show adaptations for saltatorial locomotion.[4]DiscoveryIts fossils have been found in the Carnian Lossiemouth Sandstone of Scotland. The holotype is BMNH R3556, a partial skeleton preserved as an impression in sandstone; part of the skull and tail are missing.[5] Scleromochlus is a monotypic genus (single species), including the type species S. taylori. ClassificationA lightly built cursorial animal, its phylogenetic position has been debated; as different analyses have found it to be either the basal-most ornithodiran, the sister-taxon to Pterosauria, or a basal member of Avemetatarsalia that lies outside of Ornithodira. In the phylogenetic analyses conducted by Nesbitt et al. (2017) Scleromochlus was recovered either as a basal member of Dinosauromorpha or as a non-aphanosaurian, non-pterosaur basal avemetatarsalian. However, the authors stressed that scoring Scleromochlus was challenging given the small size and poor preservation of the fossils, and stated that it could not be scored for many of the important characters that optimize near the base of Avemetatarsalia. References1. ^Sereno et Arcucci 1993; 1994 2. ^Benton 1999 3. ^{{Cite book| title = Pterosaurs: Natural History, Evolution, Anatomy|author=Witton, Mark P. |isbn=0691150613|year=2013|publisher=Princeton University Press }} 4. ^{{cite journal|doi=10.7717/peerj.1018|pmid=26157605|pmc=4476129|title=Were early pterosaurs inept terrestrial locomotors?|journal=PeerJ|volume=3|pages=e1018|year=2015|last1=Witton|first1=Mark P.}} 5. ^Basic information from Fossilsmith Sources
5 : Late Triassic reptiles of Europe|Fossil taxa described in 1907|Prehistoric ornithodirans|Triassic archosaurs|Triassic first appearances |
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