Bryozoans and Brachiopods from the Famennian (Upper Devonian) of the Central Russian Platform

Resumo

In Lipetsk and Orel oblasts the sediments of the Zadonsk Regional horizon (Lower Famennian, Upper Devonian) have yielded two species of trepostome bryozoans (Leptotrypa lipovkiensis sp. nov. and Anomalotoechus promiscuus Lavrentjeva, 1974) and brachiopods belonging to the five orders that dominate the benthic association of this horizon. These bryozoans are characterized by high variability in colony growth habits and internal structures. Representatives of both invertebrate groups obviously developed under periodically changing conditions of the inner part of a shallow shelf.