Search the Community
Showing results for tags 'lacunosamergel formation'.
Found 1 result
Aptychi mostly existed as bilaterally symmetrical pairs and were part of the anatomy of many ammonites. They are believed to have been either a two-valved closing hatch at the aperture or else a double-plate jaw piece. These particular ones are associated with the ammonite genus Aspidoceras. The photo show a pair in ventral and dorsal views.