Echinoderms (Crinoids, starfish, brittle stars, sea-urchins, sea-cucumbers)

Identified until now

• Antedon mediterranea-Mediterranean feather star - Φτερωτός αστερίας
• Hacelia attenuata - Starfish - Αστερίας
• Arbacia lixula - Black sea urchin - Μαύρος αχινός (Σουφούτης)
• Holothuria poli - White-spine sea-cucumber - Θαλασσινό Αγγούρι (Δρούλος)
• Marthasterias glacialis
• Ophidiaster ophidianus - Pink starfish - Μωβ αστερίας
• Sphaerechinus granularis - Purple sea urchin - Αχινομάνα
• Centrostephanus longispinus - Long spined sea urchin - Αχινός με μακριά αγκάθια
• Diadema setosum - Black long spine urchin - Μαύρος Μακρύκανθος Γουρλομάτης. Identification verified by Maria Sini.
• Paracentrotus lividus - Rock sea urchin - Αχινός
• Ophioderma longicauda - Snake brittle star - Οφιόδερμος εύθραυστος αστερίας

From wikipedia

Echinoderm is the common name given to any member of the Phylum Echinodermata (from Ancient Greek, ἐχῖνος, echinos – "hedgehog" and δέρμα, derma – "skin")^[2] of marine animals. The adults are recognizable by their (usually five-point) radial symmetry, and include such well-known animals as starfish, sea urchins, sand dollars, and sea cucumbers, as well as the sea lilies or "stone lilies".^[3]Echinoderms are found at every ocean depth, from the intertidal zone to the abyssal zone. The phylum contains about 7000 living species,^[4] making it the second-largest grouping of deuterostomes (a superphylum), after the chordates (which include the vertebrates, such asbirds, fishes, mammals, and reptiles). Echinoderms are also the largest phylum that has no freshwater or terrestrial (land-based) representatives.

Read more: https://en.wikipedia.org/wiki/Echinoderm

Photos: http://www.european-marine-life.org/30/echinoderms-gallery.php