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Stygimoloch is a dubious genus of the pachycephalosaur family living in the late Cretaceous period. It was distinguished from other pachycephalosaurs by the row of spikes on the back of its head, behind the dome characteristic of the family. Jack Horner has presented evidence in 2009 (and others after him) that suggests that Stygimoloch might be the juvenile form of Pachycephalosaurus.
It is revealed that there are surviving Stygimoloch populations on Isla Nublar, although they will now face an impending danger, alongside many other creatures, in the form of an erupting volcano.
It is smaller than the Pachycephalosaurus, but is more robust with a very thick neck. They were slightly oversized, the head is really big compared to the body size, the spikes are slightly different in arrangement, has a goat-like pupil which is unlikely, the torso is too short, the tail is too flexible, and has pronated wrists with claws on all five digits. The coloring is mostly reddish, with an creamy underbelly, some black lightning marks on its back and head, a white dome, dark grey spikes, a dark grey streak around its dome, dark grey and dark brown patterning all over the body.
At least three Stygimoloch were rescued from Isla Nublar, including an individual named Stiggy, who inadvertently freed Owen Grady and Claire Dearing from their cells in Lockwood Manor and disrupt the auction, thus preventing more dinosaurs from being sold off before running off into the forest. The other Stygimoloch were eventually freed by Claire and Maisie Lockwood and escape the Manor alongside all of the other dinosaurs.
Stygimoloch is a playable dinosaur in Warpath: Jurassic Park that has low attack power which compensated with high speed. The Stygimoloch has 3 colors: orange, dark green, and yellow green.
It is no. 090 of the Herbivore Ones that can be created in Jurassic Park III: Park Builder.
Stygimoloch appears in Jurassic World: Alive, with its appearance based on the film version of the dinosaur.
Stygimoloch appears in a free Jurassic World: Fallen Kingdom DLC for Jurassic World: Evolution.
Stygimoloch was made creatable in Jurassic World: The Game on July 27, 2018 as a VIP exclusive herbivore.
A new figure of Stygimoloch will be released as part of the toy-line for Jurassic World: Fallen Kingdom. Stygimoloch will also be in the LEGO JW:FK toyline.
- The inclusion of Stygimoloch in Jurassic World: Fallen Kingdom was directly challenged by Jack Horner, as he had proposed the initial theory that it was a juvenile Pachycephalosaurus. Despite this, Stygimoloch was kept in. 
- According to sound designer Al Nelson, the dinosaur's sounds were recorded from a dachshund mixed with camel and pig sounds. 
Notes and references
|Jurassic World: Fallen Kingdom Dinosaurs|
|Allosaurus • Ankylosaurus • Apatosaurus • Baryonyx • Brachiosaurus • Carnotaurus • Compsognathus • Gallimimus • Indoraptor • Mosasaurus • Parasaurolophus • Pteranodon • Sinoceratops • Stegosaurus • Stygimoloch • Triceratops • Tyrannosaurus rex • Velociraptor|
|Playable Warpath Dinosaurs|
|Acrocanthosaurus • Albertosaurus • Ankylosaurus • Carcharodontosaurus • Cryolophosaurus • Giganotosaurus • Megaraptor • Pachycephalosaurus • Spinosaurus • Stygimoloch • Styracosaurus • Suchomimus • Triceratops • Tyrannosaurus rex|