File:Isthminia holotype skull (8).png

English: Close-up of upper and lower dentition. The dentition of Isthminia panamensis (USNM 546125) in close view. (A–E) Upper dentition including the rostrum (A) and isolated teeth collected near the skull at the outcrop surface, showing (B), an upper left posterior tooth (likely PC3) and (C), an upper left posterior tooth. (F–I) Lower dentition including the mandible (F, G), shown in two parts, with overlapping images over the mandibular symphysis. (H–I) An additional isolated left tooth posterior (almost certainly PC12) was collected at the type locality. Dashed lines with arrowheads indicate alignment for the occlusion of upper and lower dentition.