Download original image
The direction of shell growth. “Old” represents the earliest secreted shell. “New” represents the shell that has been secreted most recently. “Half-new” represents the shell produced between the earliest and most recent shell structures.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.