It was closer in form to Cymbospondylus and Mixosaurus than more advanced genera like Ichthyosaurus: it did not have the dolphin-like form of later ichthyosaurs; it had a more lizard-like appearance.
The name means "Mixed Lizard", and was chosen because it appears to have been a transitional form between the eel-shaped Ichthyosaurs such as Cymbospondylus and the later dolphin-shaped ichthyosaurs, such as Ichthyosaurus.