closeup with mating nudibranch hypselodoris tryoni sabah borneo

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Closeup with mating nudibranch Hypselodoris tryoni in Sabah, Borneo. Royalty Free Stock Photo

Closeup and macro shot of nudibranch Hypselodoris tryoni during leisure dive in Sabah, Borneo. Royalty Free Stock Photo

Hypselodoris Tryoni have no shells, quills or mantle cavities, frequent shallow water, and feed mainly on sea anemones. A closeup Royalty Free Stock Photo

Closeup with mating nudibranch Hypselodoris tryoni in Sabah, Borneo.

Closeup and macro shot of the nudibranch Hypselodoris tryoni during a leisure dive in Tunku Abdul Rahman Park, Kota Kinabalu, Saba Royalty Free Stock Photo

Closeup with nudibranch Hypselodoris tryoni during leisure diving in Sabah, Borneo. Royalty Free Stock Photo

Nudibranchs are hermaphrodites. They contain both male and female reproductive systems. During copulation, they line up their genitals which are on the right side of their body. Each nudibranch receives sperm from the other. When the nudibranchs have finished mating, it takes quite an effort to pull the genitals apart.