Tetraceratops

Tet-rah-ceh-rah-tops.
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Benjamin Gutierrez

Vertebrate Paleontologist

Benjamin Gutierrez is a leading expert on dinosaurs, particularly the mighty theropods. His fieldwork in South America has uncovered new species and provided insights into dinosaur social structures.

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Name

Tetraceratops ‭(‬Four horned face‭)‬.

Phonetic

Tet-rah-ceh-rah-tops.

Named By

Matthew‭ ‬-‭ ‬1908.

Classification

Chordata,‭ ‬Synapsida,‭ ‬Classification between Class and Family‭ ‬is uncertain Tetraceratopsidae.

Diet

Carnivore.

Species

T.‭ ‬insignis‭

Size

Skull is‭ ‬9‭ ‬centimetres long.‭ ‬Total body length unknown due to lack of fossil material.

Known locations

USA,‭ ‬Texas.

Time Period

Sakmarian of the Permian.

Fossil representation

Single skull.

In Depth

       Tetraceratops has proven a headache for palaeontologists since its discovery,‭ ‬as it is either a pelycosaur,‭ ‬or potentially an early form of the coming therapsids that would displace the pelycosaurs as dominant predators.‭ ‬Evidence to support the therapsid theory comes from similarities in the temporal fenestra between Tetraceratops and biarmarosuchians,‭ ‬primitive therapsids that include Biarmosuchus.

       Whatever its phylogenetic‭ ‬lineage,‭ ‬Tetraceratops acquired its name from the four horns that adorn the top of its head.‭ ‬However,‭ ‬another pair of horns actually protruded from the rear corners of its mandible‭ (‬lower jaw‭)‬.‭

       Study of the area where the skull came from suggests that Tetraceratops lived in a drier,‭ ‬woodland environment.‭ ‬The smaller skull of Tetraceratops compared to other pelycosaurs like Ophiacodon would suggest an overall smaller body size.‭ ‬This may have allowed Tetraceratops to hunt for smaller reptiles away from the wetter swamp environments that seem to have been populated by the larger predatory pelycosaurs.

Further Reading

– A four-horned pelycosaurian from the Permian of Texas. – Bulletin of the American Museum of Natural History 24:183-185. – W. D. Matthew – 1908. – The osteology and relationships of Tetraceratops insignis, the oldest known therapsid. – Journal of Vertebrate Paleontology. 16 (1): 95–102. – M. laurin & R. R. Reisz – 1996. – Re-evaluation of Tetraceratops insignis (Synapsida: Sphenacodontia). – Journal of Vertebrate Paleontology. 21: 42A. – J. Conrad & C. A. Sidor – 2001. – The skull of Tetraceratops insignis (Synapsida, Sphenacodontia). – Palaeovertebrata. 43 (1): e1. – Frederik Spindler – 2020.

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