Fig. 3From: The first tooth set of Ptychodus atcoensis (Elasmobranchii: Ptychodontidae), from the Cretaceous of VenezuelaPartial tooth set from lower jaw of Ptychodus atcoensis (CU-010). a Specimen in distal view. b Lateral tooth files of the right side. c Symphyseal tooth in occlusal view. Anatomical abbreviations: sf symphyseal tooth file, 1llf first left lateral tooth file, 1rlf–3rlf first to third right lateral tooth fileBack to article page