[1] Miodentosaurus is a thalattosaur, a group of marine reptiles with long, paddle-like tails and short legs with independently movable digits.

Although this snout configuration is not known in any other thalattosaurians, Miodentosaurus does share a number of other features with Askeptosauroids, such as having 10 neck vertebrae and a large pineal foramen.

[3] Apart from its unique cranial features, Miodentosaurus also has characteristically flat front claws and the two specimens known were both more than four meters long, making it one of the largest thalattosaurs known.

This specimen is one of the most complete thalattosaur skeletons known and also depicts pelvic, metatarsal, and coracoid features different from those of the holotype, showing instances of individual variation within the genus.

[2] A 2023 study by Chai et al. suggested that Miodentosaurus may actually represent the same animal as the contemporary Wayaosaurus, which was named in 2007, based on similarities in the skull, dorsal vertebrae, and pubis.