Assertion: plesiosaur's teeth | /r/HasProperty | trihedral
Facets:
value: in cross-section
type: LOCATION
value: fully
type: DEGREE
value: in the kimmeridgian
type: LOCATION
Source sentences:
text: In pliosauroids of Upper Jurassic sediments of Britain, the younger Oxfordian genera have circular cross-section teeth (patterns may be used for distinguishing species) while in the Kimmeridgian, all pliosaur teeth are trihedral in cross section (Tarlo, 1960).
text: The teeth are trihedral in section, and that together with the large size suggests that the identification as Pliosaurus is probably correct.
text: P. westburyensis also possesses a unique combination of characters, including: low dentary alveolar count including only 18 postsymphysial alveoli; teeth fully trihedral in cross-section, possessing a flat, anteroposteriorly broad labial surface lacking enamel ridges; relatively slight mediolateral expansion of premaxilla and maxillary caniniform region; six premaxillary alveoli; lack of anisodont premaxillary dentition; lack of diastema between maxillary and premaxillary alveolar rows; and cervical centra lacking ventral ridge.
text: (Pliosaurus has a longer symphysis with up to 10-11 pairs of large teeth, with a total of 30-38 teeth in each ramus of the jaws; the teeth are trihedral in cross-section.)
text: However, Tarlo's 1960 definition mentions teeth that are trihedral in cross-section, considered a characteristic of Pliosaurus.