Noun: nothosaur
- Extinct semi-aquatic marine reptile, considered ancestral to plesiosaurs; had longer, more slender limbs than plesiosaurs
"Nothosaurs show an intermediate stage in the evolution of fully aquatic plesiosaurs"
Derived forms: nothosaurs
Type of: archosaur, archosaurian, archosaurian reptile
Part of: genus Nothosaurus
Encyclopedia: Nothosaur