Hi Everyone Does anyone know how to distinguish between Planorbella sp. and Planorbarius sp.? I have been sent some young freshwater pulmonate gastropods of the family Planorbidae. They have been selectively bred for different colour forms (red/spotted shells) to make attractive pets. The thing is, the person who orginally bred them cannot be sure if they are Planorbarius corneus, or Planorbella duryi. I can't tell from looking at pictures of ramshorns in the books. I want to put them in outdoor ponds, but P. duryi is not native here and I don't want to introduce an alien species into the wild (plus our climate's a bit chilly for it). If anyone's interested I've posted pics of the two colour forms here: http://www.waysideaquatics.co.uk/ramshorns%20001.jpg http://www.waysideaquatics.co.uk/ramshorns%20002.jpg Many thanks, Anna Robinson England ---------------------------------------------------------------------- [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. ----------------------------------------------------------------------