S221 - Exceedingly Rare Zapsalis abradens (Dromaeosaurid Raptor Theropod) Dinosaur Tooth - Judith River Fm Semicyclocephalus flexilis Size (long): 5cm = 1

Size (long): 5cm = 1

† Comura sp

Diagnosis: As for the type and only species

Salterolithus

S221 - Exceedingly Rare Zapsalis abradens (Dromaeosaurid Raptor Theropod) Dinosaur Tooth - Judith River Fm Semicyclocephalus flexilis Size (long): 5cm = 1Zapsalis is a genus of extinct dromaeosaurid coelurosaurian dinosaur known primarily from teeth found in the Late Cretaceous Judith River Formation of Montana and Wyoming. Identification: Very compressed tooth with rounded serrations on the distal side and smooth mesial edge. One flat tooth surface with longitudinal ridges. The unserrated form of this tooth (Paronychodon morph) may also be a premaxillary tooth of a Dromaeosaurid or Troodontid. New