closeup and macro shot nudibranch pleurobranch sidegill slug berthella martensi during leisure dive sabah borneo

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Closeup and macro shot of nudibranch Pleurobranch Sidegill Slug, Berthella martensi during leisure dive in Sabah, Borneo. Royalty Free Stock Photo

Closeup and macro shot of nudibranch Pleurobranch Sidegill Slug, Berthella martensi during leisure dive in Sabah, Borneo.

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

Nudibranchs are a group of soft-bodied, marine gastropod molluscs which shed their shells after their larval stage. They are noted for their often extraordinary colours and striking forms, and they have been given colourful nicknames to match.