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WALKER AND BRETT—POST-PALEOZOIC PATTERNS IN MARINE PREDATION(Table 2, cont.)Mosasaurs Late Cretaceous(Cenomanian to endCretaceous); most wereendemic to one region(Lucas, 1997)Crocodiles Early Jurassicto RecentPelagic, ?Benthic Ambush predators; mostmosasaurs occupied theCut guild; Crush andPierce II guilds alsooccurred (Massare, 1997)Opportunistic generalists(Massare, 1997)Benthic Ambush predators;generalists, occupying theCut, Pierce I and II, Crunch,and Crush guilds ofMassare, 1997; Globidensonly crush guild marinereptile since Triassic(Massare, 1997)Large, fleshy prey, prey with hardexterior; Globidens wascosmopolitan in distribution and isthought to be durophagous(Lingham-Soliar, 1999)Teleosaurids (teleosaurs): fish,turtles, and ammonites;Metriorynchids (geosaurs):ammonites, belemnites,pterosaurs, and giant fishLeedsichthysSea Turtles Jurassic to Recent Benthic to pelagic Generalists to specialists One form today feeds onmolluscs (Caretta ); one form inthe Late Cretaceous may alsohave fed on molluscs (Hirayama,1997); Others feed on sea grass,jellyfish, and crustaceansHybodont sharks Benthic;necto-benthicscavengers to predators;Asteracanthus haddurophagous dentition(Jurassic)Predators on surface-livingammonoidsStomach contents indicateammonoids, birds, fish,smaller mosasaurs;Clidastes, had a marineshark and a diving marinebird Hesperornis in gastriccontents (Martin and Bjork,1987)Crocodile tooth associatedwith turtle scutes in ateleosaurid;Metriorhynchus withabundant cephalopodhooklets; associated scalesof Lepidotes associatedwith skeletal elements ofSteneosaurus;Metriorhynchus toothembedded in giant fishLeedsichthysKauffman andKesling, 1960;Martin and Bjork,1987; Massare,1997Martill, 1985,1986; Hua andBuffetaut, 1997;Martell et al.,1994No fossil evidence Hirayama, 1997Belemnites; one specimen(Hybodus ) with over 250rostra in gastric contentsPollard, 1968Chimaeras Jurassic Benthic Martill et al.,1994NeoselachiansharksJurassic Benthic some with durophagousdentitionMartill et al.,1994127