Fossil genus of squamates
Morohasaurus is an extinct genus of "cf." monstersaurian squamates know from a single left dentary from the Early Cretaceous (?Albian) Ohyamashimo Formation of the Sasayama Group in Tamba City, Hyogo Prefecture, Japan. The type and only species is Morohasaurus kamitakiensis.
As of 2021, Ikeda et al. place this taxon "a conferatur" within Monstersauria based on general synapomorphies but without performing a phylogenetic analysis. The unique characters described in the paper to distinguish "Morohasaurus kamitakiensis" as a valid species include "the sinuous posteroventral rim of the dentary with a large U-shaped upper notch and small V-shaped lower notch, posteroventral corner of intramandibular septum with a weakly pointed eminence projecting posteriorly, and unicuspid, curved trenchant teeth with distinct blade-like carinae on their mesial and distal sides without grooves or serrations." If its presumed affinities are correct, "Morohasaurus" represents the oldest known monstersaurian to date.
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