Phylogenetic relationships of Early Triassic ammonoids (new data on the inner shell structure of some Olenekian ammonoids of Southern Primorye)

The inner shell structure for several ammonoid taxa (Inyoceras singularis, Anasibirites simanenkoi, A. nevolini, Yvesgalleticeras proximus, and Koninckitoides popovi) from the Olenekian of Southern Primorye is studied. The family-group level taxonomy of ammonoids is discussed.