| Gnathosaurus Temporal range: Late Jurassic,
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| Fossil skull referred to G. subulatus | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Order: | †Pterosauria |
| Suborder: | †Pterodactyloidea |
| Family: | †Ctenochasmatidae |
| Subfamily: | †Gnathosaurinae |
| Genus: | †Gnathosaurus Meyer, 1833 |
| Type species | |
| †Gnathosaurus subulatus Meyer, 1833
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| Other species | |
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| Synonyms | |
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Synonyms of G. macrurus:
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Gnathosaurus (meaning "jawed lizard") is a genus of ctenochasmatid pterosaur containing two species: G. subulatus, named in 1833 from the Solnhofen Limestone of Germany, and G. macrurus, known from the Purbeck Limestone of the UK. Its fossil remains dated back to the Late Jurassic period.