Hescheleria

Hescheleria Temporal range: Anisian-Carnian, 247.2–235 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Reconstruction of the head of Hescheleria
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Order:	†Thalattosauria
Family:	†Thalattosauridae
Clade:	†Claraziidae
Genus:	†Hescheleria Peyer, 1936
Type species
Hescheleria ruebeli Peyer, 1936b

Hescheleria is an extinct genus of thalattosaurian marine reptile from the Middle Triassic (247.2 to 235 Ma) of Monte San Giorgio in Switzerland. It is represented by a single type species, H. ruebeli, which was named in 1936.^[1]

Description

Like other thalattosaurs, Hescheleria has a slender lizard-like body with a long paddle-shaped tail. It is estimated to have grown to approximately 1 meter in length.

The skull possesses an unusually-shaped snout, with sharply downturned premaxillae. This forms a toothy hook at almost a right angle to the rest of the jaw, with a large diastema. The mandible is considerably robust and is dotted with small sharp teeth, along with a pair of pointed conical projections towards the tip, the function of which is unknown.^[2] The strange skull suggests a highly specialized lifestyle. It has been speculated^[1] that the projections on the mandible were used to crush hard-shelled prey such as molluscs. Other paleontologists disagree with this hypothesis,^[2] arguing that the projections do not occlude against any other potential crushing surface in the jaws, instead making contact with the rostral diastema.

References

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Sauropsida (Reptilia sensu lato)

Kingdom: Animalia Phylum: Chordata Superclass: Tetrapoda Clade: Amniota
Tetrapodomorpha see Tetrapodomorpha Reptiliomorpha see Reptiliomorpha Sauropsida see below↓

Sauropsida
Sauropsida †Australothyris †Erpetonyx †Microleter †Acleistorhinidae Acleistorhinus Carbonodraco Colobomycter? Delorhynchus? Feeserpeton? Karutia †Bolosauridae Belebey Bolosaurus Eudibamus †Mesosauria Brazilosaurus Mesosaurus Stereosternum †Millerettidae Broomia Heleophilus Milleretta Millerosaurus Milleropsis Nanomilleretta †Procolophonia see Procolophonia Diapsida see below↓

Diapsida
Diapsida †Adelosaurus? †Claudiosaurus †Cryptovaranoides †Dolerosaurus †Eunotosaurus? †Feralisaurus †Heleosuchus †Kenyasaurus †Kudnu †Lanthanolania †Maiothisavros †Orovenator †Palacrodon †Palaeagama †Saurosternon †Sphodrosaurus †Younginidae Galesphyrus Thadeosaurus Youngina †Tangasauridae Acerosodontosaurus? Hovasaurus Tangasaurus †Weigeltisauridae Coelurosauravus Glaurung Rautiania Weigeltisaurus †Ichthyosauromorpha see Ichthyosauromorpha †Helveticosauridae Eusaurosphargis? Helveticosaurus †Saurosphargidae Hemilopas? Largocephalosaurus Prosaurosphargis Saurosphargis Sinosaurosphargis Stauromatodon? †Sauropterygia see Sauropterygia †Thalattosauria Blezingeria? Neosinasaurus? Askeptosauroidea Anshunsaurus Askeptosaurus Endennasaurus Miodentosaurus Wayaosaurus Thalattosauroidea Agkistrognathus Clarazia Concavispina Gunakadeit Hescheleria Nectosaurus Paralonectes Thalattosaurus Wapitisaurus? Xinpusaurus †Choristodera Coeruleodraco Cteniogenys Heishanosaurus Irenosaurus Pachystropheus? Allochoristodera Hyphalosaurus Shokawa Monjurosuchus Philydrosaurus Khurendukhosaurus Lazarussuchus Neochoristodera Champsosaurus Ikechosaurus Kosmodraco Liaoxisaurus Mengshanosaurus Simoedosaurus Tchoiria †Drepanosauromorpha Ancistronychus Avicranium Dolabrosaurus Drepanosaurus Hypuronector Kyrgyzsaurus Longisquama? Megalancosaurus Protoavis? Skybalonyx Vallesaurus †Kuehneosauridae Icarosaurus Kuehneosaurus Kuehneosuchus Pamelina Rhabdopelix? Sauria (Crown-Reptilia) Lepidosauromorpha see Lepidosauromorpha Includes Lepidosauria includes rhynchocephalians and squamates Archelosauria Archosauromorpha see Archosauromorpha Includes Archosauria includes birds and crocodilians Pantestudines see Pantestudines Includes Testudines turtles

See also
Possible sauropsids Araeoscelidia Captorhinidae Protorothyrididae Recumbirostra Varanopidae Other taxa Anapsida Captorhinida Eureptilia Parareptilia Lanthanosuchoidea Millerosauria Procolophonomorpha Ankyramorpha Neodiapsida Eosuchia Younginiformes Avicephala Euryapsida

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