Adelosaurus huxleyi (Hancock and Howse 1870, Evans 1988, Late Permian) was originally considered to be a small and distinct species of Protorosaurus. Here, derived from a sister to Claudiosaurus, Adelosaurus was basal to Atopodentatus and the rest of the marine younginiformes and enaliosaurs.
Smaller than Claudiosaurus, Adelosaurus had more robust ribs. The humerus did not have an expanded distal end. The hind limb was more gracile. The proximal metatarsals were all subequal in width, except perhaps, metatarsal 5.
Adelosaurus was the most terrestrial of the known enaliosaurs, showing few aquatic characters, but the disc-like shape of the scapulocoracoid is a trait that was continued in all later taxa. Evans (1988) considered the incomplete ossification of joint surfaces as evidence for immaturity or an aquatic lifestyle. Most taxa around this node have been considered immature.
The complete reptile family tree is here.