The Ramshorn Snail has an interesting and complex reproductive system. They are hermaphrodites, meaning both sexes are present, and they can either fertilize, or be fertilized.  Although these organisms are hermaphroditic, they undergo copulation to reproduce. An organ called the ovotestis produces both egg and sperm. This is located in the visceral hump. They are both then passed along the hermaphroditic duct. The egg and sperm then separate and travel down separate channels towards their destinations. Eggs are laid in clusters.

Take a look at the picture below to see what these clusters look like! Click on the thumbnail to enlarge.

Ramshorn snail and egg cluster (orange mass). Photo by Amanda Goodman.