Two Congeneric Heart Urchins Having Different Architecture and Trophic Behavior: Paleontologic and Ichnologic Implications

Ulla Asgaard, Margit Jensen, Richard G. Bromley
1996 The Paleontological Society Special Publications  
doi:10.1017/s2475262200000162 fatcat:se3kxyu7ozd4harmz6pguyh37q