Singapore Nudibranchs - Data available on sites and dates of collection of nudibranchs. Mediterranean Slug Site - A plethora of photos and information about Opisthobranchs from the Mediterranean Sea. Also includes nudibranchs from parts of the world other than the Mediterranean. Opisthobranchia Around Hachijo Island - Photographs of nudibranchs from the Izu-Islands group of Japan. Jeff's Nudibranch Page - Devoted primarily to the nudibranchs of the Philippines, but also contains information and photographs about crinoids (Echinodermata) and reef organisms in general. The Slug Site - Devoted to the study of opisthobranch molluscs. The Okinawa Slug Site - A site featuring Okinawan Opisthobranch Molluscs, nudibranchs and other related sea slugs such as bubble-shells, sea hares and side-gilled slugs. Photos of Indo-Pacific and Red Sea Nudibranchs - A collection of photographs in which information on the camera, film used, and some species specific data are provided with each photo. [Pop-ups]. Opisthobranchs of Kii Peninsula - The page is in Japanese. Nudibranchs of Norway - Knowledge of Norwegian suggested for this site. Nudibranch Roundup - Photographs and introduction by Phillip Slosberg. Nudi Pixel - Web-based nudibranchs identification tool using photographs and underpinned by up to date scientific classification. Thecacera pennigera: Winged Thecacera - Photographs and information on this species, including its taxonomy, description, habitat, distribution, life history, population biology, physical tolerances, community ecology and invasion information. Nudibranchs - Photographs of Tenellia adspersa and Tritonia plebeia and details of their habitat, life history and range. Nudibranchs - Photographs and information provided by the National Geographic. Nudibranchs and Marine Flatworm of the World - Photos of nudibranchs from the Mediterranean, Indian Ocean, and the Red Sea. Unfortunately (from a certain perspective), there is more information about flatworms on this site than about nudibranchs. Sea Lemon: Archidoris pseudoargus - Photographs and information on this sea slug from ARKive including classification, status, description, range, habitat, biology, threats and conservation. Bibliographia Nudibranchia, Gary McDonald - A comprehensive bibliography of the literature about nudibranchs, including textbooks and local field guides. Scottish Nudibranchs - Deals almost exclusively with this part of the world.