Honestly, I am too lazy to write about Crinoid, BUT! wait…. don’t leave the page just yet… I found a really nice explanation from http://www.divegallery.com/crinoids.htm about crinoids, and you can go to that link to see other type of crinoid… however, I will just copy and paste some explanation here… My sole intention is to put my photos’ of crinoid shrimp after the explanation… hehehehe….
Crinoids, also known as “feather stars” or comatulids are harmless, colorful creatures. They are among the most ancient and primitive of ocean invertebrates. Crinoids are Echinoderms (members of the Phylum Echinodermata, meaning “spiny skin”). To feed, they extend their arms to catch bits of plankton or detritus (waste matter) passing in the current, making them “suspension feeders”. Tiny fingerlike tube feet that line the featherlike arms flick passing bits of plankton into special food gutters that run along the center of each arm; microscopic cilia carry the food along the gutter floors to the mouth. The number of arms a Crinoid has varies widely between species; some may have as many as 200, each up to almost 14 inches in length. Crinoids are distinguished from other echinoderms by the fact that their mouth is pointed upward, unlike their starfish cousins. There are nearly 550 species of comatulid crinoids worldwide. Strictly speaking the creatures featured here are comatulids, members of the Class Crinoidea, along with sea lilies (similar to comatulids but with long stalks). Collectively, comatulid crinoids and sea lilies are referred to as crinoids, since they are both members of the Class Crinoidea.
Crinoids are usually admired by divers for their bright colors, but few pause to look closely enough to see they are host to a number of tiny commensal animals, such as shrimp, clingfish, and squat lobsters. The ability of these creatures to master the art of disguise is amazing.
In my last few dives, I found those tiny animal that live inside crinoid… amazing amazing colors.. here’s their pictures.