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Marx Figure Reviews | Allosaurus | Ankylosaurus | Brontosaurus | Cavemen | Cynognathus | Dimetrodon | Hadrosaurus | Iguanodon | Kronosaurus | Megatherium | Moschops | Parasaurolophus | Plateosaurus | Pteranodon | Smilodon | Sphenacodon | Stegosaurus | Struthiomimus | Styracosaurus | Trachodon | Triceratops | Tyrannosaurus (1) | Tyrannosaurus (2) | Woolly Mammoth


Sphenacodon, like his cousin Dimetrodon, was a Pelycosaur and not a dino. Like Dimetrodon, Sphenacodons were top predators of their time, their fossil record extending from the Latest Carboniferous through to the early Middle Permian.
Though one usually thinks of a sail-backed (or 'finned') creature when thinking of a Pelycosaur, Sphenacodon didn't sport the sail like Dimetrodon or Edaphosaurus. He did, however, have long, vertebral spines that did probably give him a ridge down his back.
Two species of Sphenacodon are known: S. ferox and S. ferocior. Marx's figure is most likely a representation of the latter, as the vertebral spines in the former were not as pronounced as were those in ferocior. Ferocior was also a more robust creature than ferox.
O.C. Marsh named Sphenacodon 1878. The first fossils were found in New Mexico by David A. Baldwin.
The Zallinger-esque Sphenacodon is (in my humble opinion, anyhow) one of the coolest Marx figures. The only other Spenacodon figure I know of was made by a company called Linde (it was a 1950s coffee premium and these are quite rare).
Ol' Sphen just seems to always get overshadowed by the 'sailbacks,' Edaphosaurus and Dimetrodon--for obvious reasons.

Meaning: "Bridge Tooth"
Length: 10' long
Diet: Meat
Time Period: Late Carboniferous to Middle Permian (c. 360-270 m.y.a.)
Location: North America