BIOL 1030 Lecture Notes - Lecture 30: Sea Cucumber, Pylorus, Chordate
1 Dec 2016
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Eutely-->true end to their development due to set number. Reversible, a metabolic state of life in response to adverse environmental conditions. Enter a state called a tun with only 1% of original water content. Capable of long-term dormancy, dispersal, and resistance to harsh environmental conditions. So(cid:373)e ca(cid:374) stay i(cid:374) tu(cid:374) co(cid:374)ditio(cid:374)s lo(cid:374)ger tha(cid:374) a hu(cid:373)a(cid:374) s lifeti(cid:373)e. Superphylum deuterostomia (mouth formed by second pore opening) Dermal ossicles-tiny calcerous bones embedded in skin (endoskeleton) Madreporite-opening through which water enters externally (aboral side) Ampullae and tube feet-extend externally with cup like surface that functions like. Ampullae is like a storage pouch found in each tube foot. Always 5 or multiple of 5 pedicellarie found in some (dermal jaws) extend from skin with two calcerous jaws that can pinch, pick things up, and some with toxins for defense (defense and camouflage) 1/5 th of central body needed to regenerate. Ambulacral grooves-open groove on oral surface of each arm that stores tube feet.
