Boreskov

OP‐33too.regions.TAXONOMICAL AND ECOLOGICAL DIVERSITY OF THE FAMENIAN(UPPER DEVONIAN) NONAMMONOID CEPHALOPODSBarskov I.S.Borissiak Paleontological Institute RAS, Moscow, Russiabarskov@hotmail.comThe Late Devonian was one of warmest periods and unique stage in the Earth history.As a result of the uniformity of the global climate could be expected biotic uniformityHowever a faunal assemblage differs substantially by the highest taxa even in no distantThe Famenian was unprecedented stage in the cephalopod evolution, when theirbiodiversity reached the maximum in the Earth history.At the present times more than 200 genera belonging to 11 order (includingammonoids) were described from the Famenian. Nonammonoid cephalopods wererepresented the orders Oncocerida, Discosorida (not less 70 genera), Tarphycerida, Nautilida(subclasses Nautiloidea), orders Orthocerida and Pseudorthocerida (Orthoceratoidea), andonly few genera known from Actinoceratoidea and Bactritoidea.The main goal of the work is to compare the taxonomic features and ecological structure(proportion of different life forms) in the nonammonoid cephalopod communities from 7regions of the Northern Eurasia (central part of European Russia, South Urals, Kazakhstan,Azerbaijan, Armenia, Turkmenistan and Poland),In these regions it is known about 80 genera and 170 species from the three main group:oncocerids, discosorids and orthoceroids. This is approximately 70‐75% from allnonammonoids described from the Famenian.Comparative taxonomic analysis had shown some uncommon and even paradox results.For example Polish community has the general similarity with long distant communities ofthe South Urals and Western Kazakhstan caused by presence of common benthic,benthopelagic discosorid and oncocerid genera, whereas similarity of the pelagicorthoceroids from this regions was in two and more times less. Similarity of the communitiesof two adjacent areas: South Urals and Western Kazakhstan was considerably less.86