Back Nudibranchia AF عاريات الخيشوم Arabic عاريات الخيشوم ARZ Nudibranchia AZ نودیبرانچیا AZB Голохрили охлюви Bulgarian Nudibranquis Catalan Nudibranchia CEB Nahožábří Czech Nøgensnegle Danish
| Nudibranch | |
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| Berghia coerulescens | |
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Lembeh Straits, Indonesia
Nudibranchs are a widespread and successful group of marine Gastropod molluscs. The name means 'naked gills'. They are shelless and uncoiled Gastropods, famous for their very brilliant colours. There are more than 3000 known species.
Nudibranchs are one of the groups which are informally known as sea slugs. This is a term which includes other Gastropod groups which look similar to nudibranchs. Sea slugs is an informal term; it is not a monophyletic group.