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Gnathosaurus

Gnathosaurus
Temporal range: Late Jurassic,
Tithonian
Gnathosaurus JWPhoto.jpg
Fossil skull referred to G. subulatus
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Order: Pterosauria
Suborder: Pterodactyloidea
Family: Ctenochasmatidae
Subfamily: Gnathosaurinae
Genus: Gnathosaurus
Meyer, 1833
Type species
Gnathosaurus subulatus
Meyer, 1833
Other species
Synonyms

Synonyms of G. macrurus:

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.

History of discovery

Fragments of Gnathosaurus jaws were first discovered in 1832 in the Solnhofen limestones of southern Germany but were mistaken for a piece of teleosaurid crocodile jaw by Georg zu Münster, who first named the species Crocodilus multidens in that year. Soon afterwards, Hermann von Meyer classified the same specimen as the new genus and species Gnathosaurus subulatus, a name which came to be universally used shortly thereafter. In the 1860s, scientists such as Albert Oppel compared the G. subulatus jaw fragment to contemporary pterosaurs such as Pterodactylus and Ctenochasma, and concluded that it was also probably a "flying reptile" rather than a crocodilian. A more complete skull of an adult pterosaur was found in 1951 and classified as Gnathosaurus subulatus. This slender, 28 centimeters (11 in) long skull had up to 130 needle-like teeth arranged around the side of a spoon-shaped tip. The specimen had an estimated wingspan of about 1.7 meters (5.6 ft). It probably lead a lifestyle akin to that of modern spoonbills, wading with its jaws open and closing them upon touching small prey.

Possible juvenile specimens of G. subulatus may be known from several complete skeletons that had previously been classified as the separate species Pterodactylus micronyx. These specimens have also been referred to the genus Aurorazhdarcho, which may itself be a synonym of Gnathosaurus. However, because Gnathosaurus subulatus is currently known only from skulls and jaws, and adult Aurorazhdarcho micronyx known only from a skeleton lacking a skull, the two cannot be confidently referred to the same species. Furthermore, in the only cladistic analysis to date that tests the relationships of both taxa they are found distinct.

An additional large specimen, originally named Pterodactylus macrurus, is known from the Purbeck Limestone formation of England. Represented only by a partial lower jaw and neck vertebrae, it has since been considered closer to Gnathosaurus, and its binomial changed to G. macrurus.

Classification

Reconstruction of two G. subulatus avoiding a Dakosaurus maximus

Below is cladogram following a topology by Andres, Clark and Xu (2014). In the analysis, they recovered both species of Gnathosaurus (G. subulatus and G. macrurus) within the family Ctenochasmatidae, more precisely within the subfamily Gnathosaurinae, as sister taxa.

 Ctenochasmatidae 
 Ctenochasmatinae 

Ctenochasma

 Pterodaustrini 

Pterodaustro guinazui

Eosipterus yangi

Beipiaopterus chenianus

Gegepterus changi

Kepodactylus insperatus

Elanodactylus prolatus

 Moganopterinae 

Feilongus youngi

Moganopterus zhuiana

 Gnathosaurinae 

Huanhepterus quingyangensis

Plataleorhynchus streptophorodon

Gnathosaurus subulatus

Gnathosaurus macrurus

See also


This page was last updated at 2022-05-08 15:33 UTC. Update now. View original page.

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