The BenthOBS-B web application offers data producers working within the framework of the BenthOBS National Observation Service (SNO) an online tool for storing long-term time series related to benthic macrofauna communities (occurrence data, as well as granulometry or organic matter measurements). It is primarily used by CNRS and University teams producing data for the BenthOBS SNO, and also hosts historical data migrated from the legacy Benthos database operated by the OASU, for which it is a replacement.