Beautiful jellyfish offshore of Mulege, Baja Sur, Mexico. Photo from a sailboat.
Snail fur growing on shell occupied by Pagurus longicarpus.
Colony of our local hard coral found growing from a piece of Spisula shell. Polyps on both surfaces.
Cnidaria (/naɪˈdɛəriə/ with a silent c) is a phylum containing over 10,000species of animals found exclusively in aquatic and mostly marine environments. Their distinguishing feature is cnidocytes, specialized cells that they use mainly for capturing prey. Their bodies consist of mesoglea, a non-living jelly-like substance, sandwiched between two layers of epithelium that are mostly one cell thick. They have two basic body forms: swimming medusae and sessile polyps, both of which are radially symmetrical with mouths...