FC: Kingdom Animalia: Phylum Echinodermata
1: Echinoderms have circular symmetry, several arms (5 or more, 2 on the left, 1 in the middle, and 2 to the right) they glow from a central body. The body has five equal segments, and each segment has a duplicate set of various internal organs. Most of them have no heart, brain, nor eyes, but some brittle stars seem to have light sensitive parts on their arms. Their mouth is located on the underside and their anus on top (except feather stars, sea cucumbers and some urchins).
2: Echinoderms have tube feet which are tentacle-like structures that have suction pads located at their extremes. The tube feet are controlled by the vascular system. The vascular system runs water through canals of small muscular tubes to the tube feet. When the tube feet press against a moving object, there is no water which causes a suction effect. When water returns to the canals, suction is released.
3: There are five different classes in the Phylum Echinodermata. These five classes are: sea star o starfish (Asteroidea), brittle stars, basket stars, serpent stars (Ophiuroidea), sea urchins, heart urchins and sand dollars (Echinoidea,) holothurians or sea cucumbers (Holothuroidea) , and feather stars and sea lilies (Crinoidea).
4: Their Importance Sea urchins help control the distribution of algae and other forms of marine life. Sea stars are important predators that help control the numbers of other organisms such as clams and corals.
5: Interesting Facts: Fish love to eat sea urchins. To defend themselves from predators, sea urchins use their long sharp spines. Sometimes the spines can break off and stick onto the predator causing them to have a nasty wound, especially if the spines are venomous, which some are.
6: Interesting facts: Sea cucumbers seem defenseless, but when under attack they will sometimes extricate their guts or other internal organs to use them as decoys to a hungry predator. Later on they grow them back and grow them even larger than they were before.
7: Interesting Facts: A different kind of tropical sea cucumber puts out some sticky white threads, called Cuverian tubes. They are strong enough for an attacking crab to get tangled up in and therefore keeping the cucumber safe.
8: Interesting Facts: The brittlestar has its own way of defending itself which is losing an arm in an attack and then are able to escape
9: Necklace Sea Star-Fromia Monilis (Asteroidea)
10: Pinnules of a feather star –Pontiometra (Crinoidea)
11: Serpent Star-Ophiarachna incrassate (Ophiuroidea)
12: Sea Urchin - Diadema setosum (Echinoidea)
13: Sea Cucumber - Synaptula media (Holothuroidea)
14: References: http://oceansnsunsets.hubpages.com/hub/Echinoderms-Some-Interesting-Facts-about-these-Cool-Sea-Creatures http://tolweb.org/Echinodermata http://www.starfish.ch/reef/echinoderms.html http://www.pbs.org/kcet/shapeoflife/animals/echinoderms.html http://www.angelfire.com/mo2/animals1/phylum/echinodermata.html