Ingo Arndt / Leopard slug (Limax maximus) mating, hanging from a rope of mucus. These slugs are hermaphrodites and can be seen here transferring sperm to one another through their male organs.Switzerland. Sequence...

Tony Wu / Nudibranchs (Hypselodoris bullocki) mating, Lembeh Strait, North Sulawesi, Indonesia.

Pascal Kobeh / Nudibranchs (Nembrotha lineolata) mating, they are hermaphodites but need another individual for reproduction, Sulu Sea, Philippines

Pascal Kobeh / Nudibranchs (Nembrotha lineolata) mating, they are hermaphodites buty need another individual for reproduction, Sulu Sea, Philippines

Pascal Kobeh / Anna's nudibranchs (Chromodoris annae) two looking about to mate, Sulu Sea, Philippines

Ingo Arndt / Great Grey Slug (Limax maximus) pair mating, Switzerland

Alex Mustard / Pair of Barred hamlets (Hypoplectrus puella) spawning at dusk. This species is hermaphrodite. Wreck of the Oro Verde, Grand Cayman, Cayman Islands. Caribbean Sea.

Alex Mustard / Black hamlets (Hypoplectrus nigricans) spawning, backlit to make the eggs visible. Oro Verde Wreck, Grand Cayman, Cayman Islands. Caribbean Sea, January.

Alex Mustard / High magnification of reproductive apparatus of pair of Lined nembrotha nudibranchs (Nembrotha lineolata) mating. Anilao, Batangas, Luzon, Philippines. Verde Island Passages, Tropical West Pacific Oce...

Alex Mustard / Shy hamlets (Hypoplectrus guttavarius) pair spawning at dusk, George Town, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Birgitte Wilms / Nudibranch (Nembrotha sp) pair mating, Papua New Guinea

Birgitte Wilms / Nudibranch (Nembrotha sp) pair mating, Solomon Islands