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・ Tetracamphilius clandestinus
・ Tetracamphilius notatus
・ Tetracamphilius pectinatus
・ Tetracampidae
・ Tetracanthagyna
・ Tetracanthus
・ Tetracapsuloides bryosalmonae
・ Tetracarbon dioxide
・ Tetracarpaea
・ Tetracategory
・ Tetracene
・ Tetracentron
・ Tetracentrum
・ Tetracera
・ Tetraceratobunus
Tetraceratops
・ Tetracha
・ Tetracha carolina
・ Tetracha fulgida
・ Tetracha martii
・ Tetrachaete
・ Tetrachaetus
・ Tetrachela
・ Tetrachlorella
・ Tetrachloride
・ Tetrachloro-m-xylene
・ Tetrachloroaluminate
・ Tetrachlorodecaoxide
・ Tetrachloroethane
・ Tetrachloroethene reductive dehalogenase


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Tetraceratops : ウィキペディア英語版
Tetraceratops

''Tetraceratops insignis'' ("four-horned face emblem") is an extinct synapsid from the Early Permian that may be the first known representative of Therapsida, a group that includes mammals and their close extinct relatives. It is known from a single long skull, discovered in Texas in 1908.
==Description==

Contrary to its genus name, ''Tetraceratops'' actually has six horns, one pair being on the premaxilla bones, one pair on the prefrontal bones, and one pair on the angular processes of the mandible. When it was discovered and described in 1908, the skull was still embedded in a matrix, and only the premaxilla and prefrontal pairs were visible. In life, thus, it would have resembled a large lizard with four horns on its snout, and a pair of large spines emanating from the corners of its jaw.
In addition to horns, ''Tetraceratops'' also had an impressive set of teeth. The second pair of teeth on the maxillary bones were large and fang-like. Likewise the first teeth in the upper jaw were long and dagger-like.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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