爪齿鱼目是生活在四亿年前左右的鱼类，现已全部灭绝。牠们有可能是所有现代肉鳍鱼的其同祖先（并系群）。

基于Long在2001年，和 Lu & Zhu在2009年以及在Mikko's Phylogeny Archive 的资料

?†Quebecius quebecensis Whiteaves 1889

?†Lukeus abudda Young & Schultze 2005

?†Bukkanodus jesseni Johanson et al. 2007

†S. rolandi Jessen 1966

Onychodontida (= Onychodontiformes or Struniiformes) is an order of prehistoric sarcopterygian fish that lived between Late Silurian to Late Devonian period. The onychodontiformes are probably a paraphyletic group of basal sarcopterygians.