Pre-Cenomanian Cheilostome Bryozoa: Current State of Knowledge

摘要: This paper briefly summarizes published and new data on the occurrences of pre-Cenomanian cheilostome Bryozoa following their first appearance in Late Jurassic. We tabulate all known taxa chronologically, summarize stratigraphical geographical distributions, comment main morphological innovations that appeared times. Most early cheilostomes are classified suborder Malacostegina. Early were morphologically simple low diversity, but geographically widespread. These features can be explained by possession a long-living planktotrophic larval stage, as Recent malacostegans. Diversification Neocheilostomina, which greatly dominates modern post-Albian bryozoan faunas, began Albian coincided with origin brood chambers (ovicells) presumably short-lived, non-planktotrophic larva. The presence neocheilostomes both Europe North America implies brief life was not an obstacle to achieving wide distribution suggests role for rafting dispersal.