Jenis Crinoid Feather Stars
Jenis Crinoid Feather Stars
Jenis Crinoid Feather Stars
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Locomotion<br />
• Most crinoids are free-swimming and lack a stem, however stalked crinoids can<br />
move and can reach speeds much higher than 0.6 meters (2ft) /hr<br />
• As previously mentioned, echinoderms utilize the water vascular system to<br />
accomplish a lot of things essential for survival, one of them being locomotion.<br />
• Echinoderms move by utilizing their canals of tube feet and alternately<br />
contracting muscles that force water into the tube feet, causing them to extend<br />
and push against the ground, and then relaxing to allow the feet to retract.<br />
• Echinoderms can use their tube feet or similar extensions of the water-vascular<br />
system to also capture planktonic foods or burrow through substrates.<br />
• On the underside of the calyx, free-living varieties have a ring of specialized short<br />
arms called cirri (claws) that are used for crawling around and for holding on to<br />
surfaces.<br />
• However, they can also actively swim about by rhythmically waving their arms.<br />
http://www.youtube.com/watch?v=MoETr8BNWLQ<br />
http://www.youtube.com/watch?v=cZcomBnNKXg
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