osric

osric
FrequencyUncommon
Number appearing1d3
Armor class6
Move150-ft swimming
Hit dice12
% in lairNil
Damage per attack4d8
Special attacksNone
Special defensesNone
Magic resistanceStandard
IntelligenceNon-
AlignmentNeutral
SizeLarge

None of these creatures are technically dinosaurs, though all are found in "Lost World" areas. Plesiosaurs may have preferred smaller prey than a man but would still be dangerous.

Jurassic carnivore.

Source: OSRIC. Attribution: Stuart Marshall, with Matthew J. Finch / Black Blade Publishing. License: OGL-1.0a.