>Also are
>there any members of all classes of Mollusca that display Convergent
>evolution, Adaptive radiation, Co-evolution, or Character displacement?
 
Good examples of convergent evolution include the assorted muricids that
look like they belong in the wrong subfamily as revealed by anatomical
characters, the pulmonate false limpets convergent on true limpets, the
multiple origins of lamellibranch gills in bivalves, and zebra mussels
convergent with true mussels.
 
Many molluscan adaptive radiations have taken place in isolated basins,
including the lymnocardiid and dreissinid bivalves and various gastropods
in the Cenozoic Paratethys (of which the Black and Caspian Seas are
remnants) and anomalodesmatan bivalves in the Permian of South America.
 
Probably the best-studied examples of coevolution are predator-prey
intereactions such as boring naticids and clams, with increasing defenses
and increasing specialization over time, interrupted by extinctions.
 
David Campbell
 
"Old Seashells"
 
Department of Geology
CB 3315 Mitchell Hall
University of North Carolina at Chapel Hill
Chapel Hill NC 27599-3315
USA
 
919-962-0685
FAX 919-966-4519
 
"He had discovered an unknown bivalve, forming a new genus"-E. A. Poe, The
Gold Bug