First Record of Cadoceras (Ammonoidea: Cardioceratidae) from the Middle Callovian of Turkmenistan

The first specimen of Cadoceras milaschewici (Nikitin) found in the Middle Callovian Jason Zone of Tuarkyr (northwestern Turkmenistan) is discussed. Rare records of ammonites of the subfamily Cadocera-tinae (Cadoceras, Pseudocadoceras, Chamoussetia) are known from the Lower Callovian of adjacent areas—the Northern Caucasus, Mangyshlak, and the Bolshoi Balkhan Ridge. The only published find of a Middle Callovian Cadoceras from the Peri-Caspian region comes from the Jason Zone of Dagestan (Northern Caucasus). It is possible that the local environments were not suitable for Cadoceras, a genus with a cadiconic shell widely represented in the Upper Bathonian–Middle Callovian of the Russian Platform.