Great Balkhan Representatives of the subfamily Cheloniceratinae Spath, 1923 (Ammonoidea)from the Aptian of Mangyshlak, Western and Southern Turkmenistan. Paper 2. The Genus Epicheloniceras Casey, 1954 Authors: Polkovoi K. S. The representatives ofthe genusEpicheloniceras Casey, 1954fromthe Middle Aptian of Mangyshlak, Western and Southern Turkmenistan are described.