Futabasaurus suzukii Life restoration。by Connor Ashbridge，by CC BY-SA 4.0 。 Age Late Cretaceous (Santonian) 86.3–85 Ma Taxonomy Kingdom: Animalia Phylum: Chordata Class: Reptilia Order: Plesiosauria Family: Elasmosauridae Genus: Futabasaurus Species: Futabasaurus suzukii Morphological description Skeletal reconstruction of Futabasaurus suzukii . Photo by Rodrigo (Ueno, Tokyo). Futabasaurus suzukii is an elasmosaurid plesiosaur represented by the holotype specimen NSM PV15

Reconstruction of Liopleurodon ferox （Image source：DiBgd， CC BY-SA 4.0 ） Age Jurassic（Callovian-Kimmeridgian） 166-155 Ma Taxonomy Kingdom: Animalia Phylum: Chordata Class: Sauropsida Order: Plesiosauria Family: Pliosauridae Clade: Thalassophonea Genus: Liopleurodon Species: Liopleurodon ferox Morphological description Liopleurodon ferox is a pliosaurid (Pliosauridae) short-necked plesiosaur characterized by a reduced cervical region, a robust trunk, and limbs fully modifie

Reconstruction of Atopodentatus unicus （Image source：Spinosaurid， CC BY-SA 4.0 ） Age Triassic（Anisian） 247.2-242 Ma Taxonomy Kingdom: Animalia Phylum: Chordata Class: Sauropsida Superorder: Sauropterygia Genus: Atopodentatus Species: Atopodentatus unicus Morphological description The snout of Atopodentatus unicus is dorsoventrally flattened and expanded laterally into a hammerhead-like structure, with symmetrical transverse projections formed by both the upper and lower jaw