Invertebrates
24 species of sea urchins, 28 of sea stars, 30 of sea cucumbers, approximately 600 of mollusca, and more than 100 of crabs exist in the Galapagos. The colors of the Blue Sea Star Phataria Unifascialis, the shape of the Black Spiny Brittle Star Ophiocoma aethiops, the red phosphorescent skin of the Horse conch Fasciolaria Princeps and the quantity of Slate Pencil Urchins Eucidaris thouarsii will fascinate you during the dives. We strongly recommend the book "A Field Guide to Sea Stars and other Equinoderms of Galápagos. By Cleveland P.Hickman, Jr. of Sugar Spring Press, 1998.
