Tylosaurus
CR: 8 XP: 4,800
N Gargantuan animal
Init: +1 Senses: low-light vision, darkvision 60 ft. Perception: +14
Defense
AC: 20, touch 8, flat-footed 18 (+1 Dex, +1 dodge, +12 natural, –4 size)
HP: 105 (10d8+60)
Fort: +15 Ref: +8 Will: +8
Offense
Speed: 20 ft., swim 50 ft.
Melee: bite +15 (2d8+18 plus grab)
Space: 15 ft. Reach: 15 ft.
Special Attacks: swallow whole (2d6+12 bludgeoning, AC 16, hp 10)
Statistics
Str: 34 Dex: 13 Con: 22 Int: 2 Wis: 13 Cha: 9
Base Atk: +7 CMB: +23 (+27 grapple) CMD: 34 (38 vs. trip)
Feats: Dodge, Cleave, Great Fortitude, Mobility, Power Attack
Skills: Perception +14, Swim +16
Ecology
Environment: any aquatic (Plane of Water)
Organization: solitary
Treasure: triple
Description
This predatory marine lizard swims with four flippered limbs and a powerful, fluke-like tail. Its extended snout is filled with sharp teeth, and it feeds on both aquatic and surface prey. They are known to attack ships, mistaking them for basking whales or other creatures. A tylosaurus grows up to 50 feet in length and weighs 30,000 pounds.
Source: Pathfinder Roleplaying Game Bestiary 2, p. 91