科的獸腳類恐龍,大約生存於1億3000萬至1億2500萬年前的早白堊世巴列姆階。首具化石於1983年發現於英格蘭薩里郡的威爾德黏土組(英语:WealdClay),並成為模式種沃氏重爪龍(Baryonyx walkeri)的正模標本,由古生物學家亞倫·查理格(英语:Alan J. Charig)和安琪拉·米爾納(英语:Angela
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Harrow Weald: Capital Transport. 2001: 58 [1977]. ISBN 1-85414-241-0. Rails Through The Clay : Croome & Jackson : Lond.: 1962 Rails Through The Clay : Croome
Andrews, Charles William. Description of a new plesiosaur from the WealdClay of Berwick (Sussex). Quarterly Journal of the Geological Society of London