Terminocavus

Terminocavus is a genus of ceratopsid dinosaur from the late Cretaceous Period of what is now North America. The genus contains a single species, the type species Terminocavus sealeyi, known from a parietal and some other associated fragments. The holotype specimen was discovered in the Kirtland Formation of New Mexico in 1997, and was later described and named in a 2020 study. It was similar in anatomy to Pentaceratops and Anchiceratops, which it was closely related to, but had a distinctive heart-shaped upper frill with very narrow notch. It has been hypothesized to form an anagenetic series with several other chasmosaur species.

==Discovery and naming== thumb|left|Geological map of the southeast San Juan Basin; B (upper middle) is where the holotype was found The holotype specimen NMMNH P-27468, collected in 1997, consists of a parietal (or fused paired parietals), other skull fragments, a partial sacrum, and vertebral fragments. It was discovered in grey siltstone deposits from the Campanian Hunter Wash Member of the Kirtland Formation of the San Juan Basin in New Mexico. It is the only diagnostic chasmosaurine specimen discovered from the middle or upper part of the Hunter Wash Member. The age of the specimen is undetermined; its frill texture indicates it is a young subadult, but its large size and epiparietal fusion would indicate it represents an adult.