On the Earliest Parkinsonia (Ammonoidea: Parkinsoniidae) from the Upper Bajocian (Middle Jurassic) of the Northern Caucasus, Russia

Abstract

The first representatives of the genus Parkinsonia previously described from Georgia as P. djanelidzei Kakhadze, 1937 and P. djanelidzei var. dertshiensis Kakhadze, 1937 are revised. P. djanelidzei [M] and P. dertshiensis [m] are described and illustrated. The name P. (Okribites) djanelidzei Kakhadze, 1937 is a junior primary homonym of P. (Parkinsonia) djanelidzei Kakhadze, 1937 and is permanently invalid.