Stygimoloch

Name: Stygimoloch ‭(‬Styx demon‭).
Phonetic: Stij-e-mol-ok.
Named By: P.‭ ‬M.‭ ‬Galton‭ & ‬H.‭ ‬-D.‭ ‬Sues‭ ‬-‭ ‬1983.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Dinosauria,‭ ‬Ornithischia,‭ ‬Pachycephalosauridae,Pachycephalosaurinae.
Species: S.‭ ‬spinifer‭ (‬type‭)‬.
Diet: Herbivore.
Size: Skull reconstructed to be‭ ‬46‭ ‬centimetres long.‭ ‬Total body size uncertain but may roughly have been just over three meters long.
Known locations: USA - Ferris Formation, Hell Creek Formation.
Time period: Maastrichtian of the Cretaceous.
Fossil representation: Remains of several individuals.

       Stygimoloch is a dubious genus of pachycephalosaurid dinosaur as many palaeontologists are of the opinion that Stygimoloch represents a juvenile/subadult Pachycephalosaurus.‭ ‬In‭ ‬addition to this another genus named Dracorex has also been perceived to be an even younger Stygimoloch,‭ ‬and it is not out of the question that one day both Stygimoloch and‭ ‬Dracorex may be confirmed as juvenile Pachycephalosaurus.

Further reading
-‭ ‬New data on pachycephalosaurid dinosaurs‭ (‬Reptilia:‭ ‬Ornithischia‭) ‬from North America.‭ ‬Canadian Journal of Earth Sciences‭ ‬20‭(‬3‭)‬:462-472.‭ ‬-‭ ‬P.‭ ‬M.‭ ‬Galton‭ & ‬H.‭ ‬-D.‭ ‬Sues‭ ‬-‭ ‬1983.
-‭ ‬Cranial anatomy and diagnosis of Stygimoloch spinifer.‭ ‬-‭ ‬Journal of Vertebrate Paleontology‭ ‬18‭(‬2‭)‬:‭ ‬363-375.‭ ‬-‭ ‬M.‭ ‬B.‭ ‬E.‭ ‬Goodwin,‭ ‬et al‭ ‬-‭ ‬1998.
-‭ ‬Extreme cranial ontogeny in the Upper Cretaceous Dinosaur Pachycephalosaurus.‭ ‬-‭ ‬PLoS ONE,‭ ‬4‭(‬10‭)‬:‭ ‬e7626.‭ ‬-‭ ‬J.‭ ‬R.‭ ‬Horner‭ & ‬M.‭ ‬B.‭ ‬Goodwin‭ ‬-‭ ‬2009.

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