Scope and terminology[edit] There is no official, canonical list of plesiosaur genera but one of the most thorough attempts can be found on the Plesiosauria section of Mikko Haaramo's Phylogeny Archive;[1] also pertinent is the Plesiosaur Genera section at Adam Stuart Smith's Plesiosaur Directory.[2] Naming conventions and terminology follow the International Code of Zoological Nomenclature. Technical terms used include: