Theropod teeth from the Judith River Formation of southern Alberta, Canada

Theropod teeth from the Middle-Upper Jurassic Shishugou Formation of northwest Xinjiang, China

“…This pattern differs from the deeply veined enamel texture visible in spinosaurids (e.g., Baryonyx, Spinosaurus, Suchomimus; e.g., Charig and Milner 1997;Hasegawa et al 2010;Buffetaut 2012) and the irregular texture in Abelisauridae and most Maniraptoriformes (Hendrickx and Mateus 2014a). Comparison to the dentition of other theropods Morphological comparison.-Teeth of Megalosauridae are easily distinguishable from those of Coelophysidae, Abelisauridae, Noasauridae, Spinosauridae, Tyrannosauroidea, Com psognathidae, Dromaeosauridae, Therizinosauria, and Troodontidae, all of which have highly specialized dentition. Therizinosauria and Troodontidae have leaf-shaped crowns with constricted cervix, and the teeth are unserrated or bear very few serrations, and either minute denticles or large pointed denticles sometimes changing dramatically in shape along the carinae (e.g., Currie 1987;Currie et al 1990;Clark et al 1994;Zhao and Xu 1998;Barrett 2000;Norell et al 2009;Zanno 2010;Hendrickx and Mateus 2014b).…”

“…When present, the mesial carina of lateral teeth can be twisted, as in Dromaeosaurus (Currie et al 1990;Currie 1995), or bear mesial denticles that are smaller than the distal ones, as in Atrociraptor (Currie and Varricchio 2004), Deinonychus (Ostrom 1969), Velociraptor (Sues 1977;Barsbold and Osmólska 1999), Bambiraptor (Burnham 2004), Saurornitholestes (Currie et al 1990), and Acheroraptor (Evans et al 2013). The distal denticles can also be hooked apically, as in Deinonychus (Ostrom 1969), Saurornitholestes (Currie et al 1990) and Atrociraptor (Currie and Varricchio 2004). Moreover, the lateral teeth tend to have a wide apicobasally elongated concavity on the basolabial surface of the crown (Gianechini et al 2011; CH personal observations), a depression which is also usually well-developed on the lingual surface of the crown.…”

“…These lingual and labial concavities are particularly clear in some dromaeosaurids such as Sinornithosaurus (Xu and Wu 2001) and were interpreted as a venom delivery duct (Gong et al 2010(Gong et al , 2011. Finally, the mesial teeth of dromaeosaurids are different from those of Megalosauridae; they either lack a mesial carina, as in Tsaagan (IGM 100-1015) and Velociraptor (AMNH 6515), or the mesial carina curves strongly lingually, as in Deinonychus (Ostrom 1969), Dromaeosaurus (Currie et al 1990;Currie 1995) and Saurornitholestes (Currie et al 1990).…”

Primera cita de cocodrilos zifodontos en el Cenozoico de Asturias: Royo Gómez y los supuestos dientes de dinosaurio del Eoceno de Llamaquique

“…Estos dentículos son rectos, perpendiculares al borde mesial/distal (con forma de cincel; "chisel shaped" sensu Currie et al, 1990) y están separados por hendiduras bien delimitadas ("interdenticle slits" sensu Currie et al, 1990). El número de dentículos por mm (serration density [SD] de Farlow & Brinkman, 1987) es de 3,5 en la parte media de la carena distal, donde se conservan 22 dentículos en 6,3 mm (Fig.…”

“…No hay desarrollo de surcos inclinados entre los dentículos y las superficies labial/lingual del diente ("blood grooves" sensu Currie et al, 1990).…”