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[APD] RE: limpets (piaba)




Freshwater limpets are small to minute and, like freshwater mollusks in
general, polyphyletic. While all are basomatophoran pulmonates, the
limpet-like form has arisen multiple times within that group, from more than
one lineage of coiled ancesters. The Lancinae are confined to the Pacific
drainages of North America while the Acroloxidae have an extremely disjunct
distribution, several widely separated localities scattered over the
northern hemisphere. They share a dextral organization of soft anatomy which
is reflected in the assymetry of their shells. All other freshwater limpets
have a sinistral organization, and a corresponding sinistral assymetry in
the shell.

Some more info here
http://www.seanet.com/~leska/Online/Guide.html
http://www.nzfreshwater.org/molluscs.html
http://www.flmnh.ufl.edu/natsci/malacology/fl-snail/snails4.htm
http://www.lander.edu/rsfox/310PecturaLab.html


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