The following 2 photos show this flatworm mating. Click here for another species of flatworms mating
Almost all species of flatworms are hermaphrodites (male as well as female reproductory organs). They copulate to engage in mutual cross-fertilization. During copulation worms were observed to move towards each other, touch, then wind themselves around each other. Then they rear up and try to stab each other anywhere, sometimes causing considerable damage to their partner. During that time, spermatozoa are injected into the partner.
Japanese cargo wreck, Malapascua island, Cebu, Philippines, March 2001
Taken with a Sea and Sea Motomarine II EX , 1:2, F 22
. Copyright Teresa Zubi