Nudibranchs in The Right Blue

Nudibranchs-- also called sea slugs -- are marine gastropod molluscs (snails) that do not have a shell. (The name 'nudibranch' means bare gills.)  Most tropical nudibranchs are small and brightly colored, so they are a popular  subject for underwater macro photography.

Here is a directory of articles about nudibranchs in The Right Blue:

• Trailing behavior in Risbecia nudibranchs (Risbecia pulchella)- Sep. 1, 2008
• Exotic Underwater Nudies - The Spanish Dancer (Hexabranchus sanguineas)- Sep. 18, 2008
• Hawaii's Gold Lace Nudibranch (Halgerda terramtuentis) - Sep. 29, 2008
• The Blue Dragon, a Solar-Powered Nudibranch (Pteraeolidia ianthina) - Oct. 12, 2008
• Dotted Sea Slug from the Mediterranean (Peltodoris atromaculata) - Oct. 25, 2008
• The Blue Sphinx nudibranch (Phyllidiopsis sphingis) - Mar. 9, 2009
• How do critters get their scientific names, and what do they mean? - June 13, 2009
• All set for a pajama party on the reef? (Chromodoris quadricolor) - June 13, 2009
• Purple sea slug (Hypselodoris apolegma) - Apr. 15, 2010

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Here is a directory of nudibranch photos on The Right Blue, sorted alphabetically by family name and species name:

Asteronotidae

• Gold Lace nudibranch (Halgerda terramtuentis), Hawaiian endemic species, two macro photos - Pacific: Puako, Hawaii

Chromodorididae

• Coi nudibranch (Chromodoris coi), macro photo - Celebes Sea: Pulau Sipadan
• Striped Pajama nudibranch (Chromodoris quadricolor), macro photo - Red Sea: Egypt
• Striped Pajama nudibranch (Chromodoris quadricolor), feeding on sponge - Red Sea: Egypt
• Vibrating nudibranch (Chromodoris vibrata) - Pacific: Puako, Hawaii
• Purple sea slug (Hypselodoris apolegma), macro photo - Celebes Sea: North Sulawesi
• Pair of Risbecia nudibranchss (Risbecia pulchella) - Red Sea: Ras Mohammed, Egypt

Discodorididae

• Dotted Sea Slug (Peltodoris atromaculata), three macro photos, incl. feeding behavior - Aegean Sea: Greece

Hexabranchidae

• Spanish Dancer (Hexabranchus sanguineus), largest nudibranch species in the world - Red Sea: Gordon Reef
• Spanish Dancer egg mass rosettes (Hexabranchus sanguineus), bottom of page - Celebes Sea: Bunaken Island, Indonesia

Phyllidiidae

• Blue Sphinx nudibranch (Phyllidiopsis sphingis) - Pacific: Puako, Hawaii

Pteraeolidiidae

• Blue Dragon nudibranch (Pteraeolidia ianthina), two macro photos - Celebes Sea: Malaysia and Indonesia

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Nudibranch video:

• Spanish Dancer (Hexabranchus sanguineus), shows how the creature 'swims'