Folks,
Does anyone know the name of the ubiquitous cap-shell (Hipponix? or
whatever the newer name is) that invariably attaches singly or in pairs to
the parietal area of shallow water gastropods in Sri Lanka?
And how does it "know" how to find the parietal area?
It's about 5mm in diameter, white, with radiating ribs. Apex is elevated
and pointed to one side.
David Kirsh
Durham, NC