Paronychodon lacustris Cope, 1876a

Sahni, Ashok, 1972, The vertebrate Fauna of the Judith River formation, Montana, Bulletin of the American Museum of Natural History 147 (6), pp. 319-416 : 360

publication ID

https://doi.org/ 10.5281/zenodo.3382461

DOI

https://doi.org/10.5281/zenodo.4710472

persistent identifier

https://treatment.plazi.org/id/1A7187CF-FFC1-1776-FE54-FE00E048524A

treatment provided by

Plazi

scientific name

Paronychodon lacustris Cope, 1876a
status

 

Paronychodon lacustris Cope, 1876a

Figures 8S, T View FIG ; 9J, K View FIG

Paronychodon lacustris COPE, 1876a , p. 256.

Zapsalis abradens COPE, 1876b, p. 345.

Tripriodon caperatus MARSH, 1889b, pl. 3, figs.18-22.

The genus was originally described by Cope (1876a, p. 256) from detached teeth obtained from the Judith River Formation. Zapsalis abradens was also described by Cope (1876b, p. 345) from the same area and is a larger, worn tooth of Paronychodon . Teeth referable to Paronychodon lacustris were named Tripriodon caperatus ( Marsh, 1889b, pl. 3, figs. 18- 22) because of a supposed identity as the incisors of the multituberculate Meniscoessus Cope (= Dipriodon Marsh ). Clemens (1963b, pp. 85-86) showed that Meniscoessus incisors were significantly different from Paronychodon and Estes (1964) has demonstrated that P. lacustris is a carnivorous dinosaur.

The rare genus Paronychodon is represented in the collection by about six teeth of various sizes. The largest (AMNH 8522, fig. 8S, T) has a length of 13 mm. and a basal width of about one-third the length, and the smallest (AMNH 8523, fig. 9J, K) has a height of 4.8 mm. and a basal width of about 2.8 mm. Other differences in morphology also exist. AMNH 8522, from Clambank Hollow, is relatively less curved than teeth of Deinodon . At least four ridges were present on the internal side of the crown but these have been worn down. The smaller teeth are more curved and are not denticulated on the posterior or anterior side, although sharp ridges are present.

Kingdom

Animalia

Phylum

Chordata

Class

Reptilia

Order

Dinosauria

Family

Troodontidae

Genus

Paronychodon

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