Tetraceratops insignis ("four-horned face emblem") is an extinct synapsid from the Early Permian that was formerly considered the earliest known representative...

Permian of China is likely to be the earliest-diverging known therapsid. Tetraceratops from the Early Permian of the United States has been hypothesized to...

†Haptodus †Hypselohaptodus †Ianthodon Pantherapsida †Kenomagnathus †Tetraceratops †Palaeohatteriidae Sphenacodontoidea Shashajaia †Sphenacodontidae Therapsida...

petrological geology, one on botany, one on trilobites, and he described Tetraceratops insignis, which was much later suggested to be the oldest known (Early...

has been some controversy as to whether Tetraceratops is a therapsid or a more basal pelycosaur. If Tetraceratops is a therapsid, as has recently been proposed...

1130/SPE28-p1. Amson, Eli; Laurin, Michel (2011). "On the affinities of Tetraceratops insignis, an Early Permian synapsid". Acta Palaeontologica Polonica...

Ctenorhachis Cutleria Macromerion Neosaurus Secodontosaurus Steppesaurus? Tetraceratops? Sphenacodontinae Cryptovenator Ctenospondylus Dimetrodon Sphenacodon...

†Cutleria †Haptodus †Hypselohaptodus †Kenomagnathus †Tetraceratops †Palaeohatteriidae Palaeohatteria Pantelosaurus Sphenacodontoidea...

†Cutleria †Haptodus †Hypselohaptodus †Kenomagnathus †Tetraceratops †Palaeohatteriidae Palaeohatteria Pantelosaurus Sphenacodontoidea...

†Cutleria †Haptodus †Hypselohaptodus †Kenomagnathus †Tetraceratops †Palaeohatteriidae Palaeohatteria Pantelosaurus Sphenacodontoidea...

†Cutleria †Haptodus †Hypselohaptodus †Kenomagnathus †Tetraceratops †Palaeohatteriidae Palaeohatteria Pantelosaurus Sphenacodontoidea...

†Cutleria †Haptodus †Hypselohaptodus †Kenomagnathus †Tetraceratops †Palaeohatteriidae Palaeohatteria Pantelosaurus Sphenacodontoidea...

†Cutleria †Haptodus †Hypselohaptodus †Kenomagnathus †Tetraceratops †Palaeohatteriidae Palaeohatteria Pantelosaurus Sphenacodontoidea...

The dry interior with small insectivores. Caseids and prototherapsid Tetraceratops made their appearance. The marine life was probable more diverse than...

†Cutleria †Haptodus †Hypselohaptodus †Kenomagnathus †Tetraceratops †Palaeohatteriidae Palaeohatteria Pantelosaurus Sphenacodontoidea...

†Cutleria †Haptodus †Hypselohaptodus †Kenomagnathus †Tetraceratops †Palaeohatteriidae Palaeohatteria Pantelosaurus Sphenacodontoidea...

†Cutleria †Haptodus †Hypselohaptodus †Kenomagnathus †Tetraceratops †Palaeohatteriidae Palaeohatteria Pantelosaurus Sphenacodontoidea...

†Cutleria †Haptodus †Hypselohaptodus †Kenomagnathus †Tetraceratops †Palaeohatteriidae Palaeohatteria Pantelosaurus Sphenacodontoidea...

†Cutleria †Haptodus †Hypselohaptodus †Kenomagnathus †Tetraceratops †Palaeohatteriidae Palaeohatteria Pantelosaurus Sphenacodontoidea...

†Cutleria †Haptodus †Hypselohaptodus †Kenomagnathus †Tetraceratops †Palaeohatteriidae Palaeohatteria Pantelosaurus Sphenacodontoidea...

†Cutleria †Haptodus †Hypselohaptodus †Kenomagnathus †Tetraceratops †Palaeohatteriidae Palaeohatteria Pantelosaurus Sphenacodontoidea...

†Cutleria †Haptodus †Hypselohaptodus †Kenomagnathus †Tetraceratops †Palaeohatteriidae Palaeohatteria Pantelosaurus Sphenacodontoidea...

†Cutleria †Haptodus †Hypselohaptodus †Kenomagnathus †Tetraceratops †Palaeohatteriidae Palaeohatteria Pantelosaurus Sphenacodontoidea...

†Cutleria †Haptodus †Hypselohaptodus †Kenomagnathus †Tetraceratops †Palaeohatteriidae Palaeohatteria Pantelosaurus Sphenacodontoidea...

†Cutleria †Haptodus †Hypselohaptodus †Kenomagnathus †Tetraceratops †Palaeohatteriidae Palaeohatteria Pantelosaurus Sphenacodontoidea...

†Cutleria †Haptodus †Hypselohaptodus †Kenomagnathus †Tetraceratops †Palaeohatteriidae Palaeohatteria Pantelosaurus Sphenacodontoidea...

†Cutleria †Haptodus †Hypselohaptodus †Kenomagnathus †Tetraceratops †Palaeohatteriidae Palaeohatteria Pantelosaurus Sphenacodontoidea...

†Cutleria †Haptodus †Hypselohaptodus †Kenomagnathus †Tetraceratops †Palaeohatteriidae Palaeohatteria Pantelosaurus Sphenacodontoidea...

†Cutleria †Haptodus †Hypselohaptodus †Kenomagnathus †Tetraceratops †Palaeohatteriidae Palaeohatteria Pantelosaurus Sphenacodontoidea...

Ophiacodontidae Family Edaphosauridae Family Sphenacodontidae Order Therapsida Tetraceratops Suborder Biarmosuchia Family Phthinosuchidae Family Biarmosuchidae Family...