Jenis Crinoid Feather Stars

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Locomotion • Most crinoids are free-swimming and lack a stem, however stalked crinoids can move and can reach speeds much higher than 0.6 meters (2ft) /hr • As previously mentioned, echinoderms utilize the water vascular system to accomplish a lot of things essential for survival, one of them being locomotion. • Echinoderms move by utilizing their canals of tube feet and alternately contracting muscles that force water into the tube feet, causing them to extend and push against the ground, and then relaxing to allow the feet to retract. • Echinoderms can use their tube feet or similar extensions of the water-vascular system to also capture planktonic foods or burrow through substrates. • On the underside of the calyx, free-living varieties have a ring of specialized short arms called cirri (claws) that are used for crawling around and for holding on to surfaces. • However, they can also actively swim about by rhythmically waving their arms. http://www.youtube.com/watch?v=MoETr8BNWLQ http://www.youtube.com/watch?v=cZcomBnNKXg
Avoiding being eaten • Stalked crinoids today live only in the deep ocean, in quiet water below the lighted zone where it’s too dark for predators so seem them. • They live so deep in the water because they are attached to the sea floor and can’t escape, making them very vulnerable to predators in lighted shallow water. • They can crawl around on a reef, hiding in crevices during the day and climbing onto corals at night to feed • By only feeding at night, they make it harder for predators to find them.
Page 1 and 2: Crinoid Feather Stars Scientific (G
Page 3 and 4: Evolutionary Relationships Fossil C
Page 5: o Their Pinnules arose in several l
Page 8 and 9: o So each arm is a series of ossicl
Page 12 and 13: Reproduction and life cycle • The
Page 14: • Thy approximate 80 surviving sp

Jenis Crinoid Feather Stars

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