Georgette Douwma / Nudibranch (Risbecia tryoni) pair moving along together, Mabul, Malaysia.

Franco Banfi / Nudibranch ( Risbecia tryoni) at Three sisters dive site, Farondi Island, Raja Ampat, Irian Jaya, West Papua, Indonesia, Pacific Ocean

Juergen Freund / Nudibranchs (Risbecia Tryoni) mating. Lembeh Strait, North Sulawesi, Indonesia.

Sue Daly / Nudibranch (Risbecia tryoni) Lembeh Straits, Sulawesi, Indonesia

Sue Daly / Nudibranch (Risbecia tryoni) pair, Lembeh Straits, Sulawesi, Indonesia

Juergen Freund / Chromodoris nudibranchs (Risbecia tryoni)

Juergen Freund / Chromodoris nudibranch (Risbecia tryoni)

Juergen Freund / Chromodoris nudibranch (Risbecia tryoni)

Juergen Freund / Chromodoris nudibranchs (Risbecia tryoni)

Juergen Freund / Chromodoris nudibranch (Risbecia tryoni)

Georgette Douwma / Two Nudibranchs {Risbecia tryoni}, mating pair, Rinca, Indonesia.

Georgette Douwma / Nudibranch {Risbecia tryoni} starting mating. The two purple sausage shaped structures by the gill are the eggs sacs of a parasitic copepod living inside the slug. Rinca, Indonesia