>From: Rick Harbo <[log in to unmask]> >Reply-To: Conchologists List <[log in to unmask]> >To: [log in to unmask] >Subject: Re: a variety of drill holes in shells >Date: Thu, 16 Dec 2004 16:42:10 -0800 > >There are two major groups of shell-boring gastropods, the moonsnails, Naticidae and the Muricidae. Typically the naticids drill a hole with bevelled edges and the muricids drill cylindrical holes with nearly straight edges. > >Most boring predatory snails, including the oyster drill,  alternate the use of a radula from the proboscis  and a separate ABO (accessory boring organ) that secretes chemicals. > >Several other organisms also drill into shells, including: >-sponges, Cliona >-octopus- extremely small inner borehole diameter, irregular or oval, but not circular >-polyclad flatworm, bores holes into the shell of juvenile oysters and scallops >-small marine cottid fish, Asemichthys taylori,  punches a hole or series of holes in the prey shell- not truly 'bored" > >There have been reports of burrowing polychaete worms, boring regular round boreholes in freshwater molluscs. > > >cheers >Rick Harbo >Nanaimo, B.C. Canada >   ----- Original Message ----- >   From: Jack Donner >   To: [log in to unmask] >   Sent: Wednesday, December 15, 2004 11:44 AM >   Subject: drill holes > > >   I have several shells with predator drill holes in them.  Concave holes are made by moonsnails using a radula.  Vertical sided tubular holes are made by oyster drills.  Does anyone know what mechanism oyter drills use?  Thanks,  Jack Donner  [log in to unmask] >   ---------------------------------------------------------------------- [log in to unmask] - a forum for informal discussions on molluscs To leave this list, click on the following web link: http://listserv.uga.edu/cgi-bin/wa?SUBED1=conch-l&A=1 Type your email address and name in the appropriate box and click leave the list. ----------------------------------------------------------------------