Stemless crinoids, are quite common on reef structures, are very active They are closely related to starfish.

Crinoids are rather elegant relatives of the brittle stars, sea stars, and sea urchins, and can be quite spectacular in appearance. As for the minor reaction to the crawling crinoid, the fact that they can crawl is not too unusual. The larva is ".

A feather star habitat differs from a starfish habitat in a number of ways. The canals are in some of the pinnules which break open to release sperm and eggs.

Crinoids have genital canals that produce gametes, but they do not have gonads. Crinoids can be divided into two different types, depending on their feeding strategy: whether they like moving water or not. Top Answer Wiki User 2011-02-10 16:41:46 2011-02-10 16:41:46 They reproduce and take sides of their mates... when this happens they will grow and develope. Hope this helped! Some species do, however, exist in colder waters and deeper areas. Photosynthesis occurs in the chlorophyll of plants.. Crinoids are animals; do be specific, they are enchinoderms. No, they don't. Those that do like moving water are called rheophilic (current seeking) and those that do not are called rheophobic (current avoiding or fearing). Sea urchins are members of the phylum Echinodermata, which also includes sea stars, sea cucumbers, brittle stars, and crinoids.Like other echinoderms, they have five-fold symmetry (called pentamerism) and move by means of hundreds of tiny, transparent, adhesive "tube feet". Feather stars, also called crinoids, reside in the ocean, typically in shallow, warm waters. You might see them offered for sale at times, but as pretty as they may be their survival record in home aquariums is downright dismal. However, they're interesting invertebrate animals nonetheless, so I'll … I do not understand why professionals only yawned. How do echinoderms grow? The fertilized eggs eventually hatch in the water.