2006-11-05 10:30:56 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Zoology
Externally they have spines, tube feet, pedicellaria, all of which are attached to the calcium carbonate test. The muscles attached to all these parts allow movement of these parts. At the ventral mouth reveals their "aristotle's lantern" aka their fancy mouth-mouthparts designed much like garbage disposal blades. The 5 white teeth set up like a grinding-beak can eat away at the kelp bed. Inside they have some organs, mostly reproductive organs that hold their gametes between spawnings-breedings. They also have a digestive system with an anus. They have a water vascular system inside which circulates water for a hydraulic pump, NOT blood!
2006-11-05 15:18:07 · answer #1 · answered by gopigirl 4 · 0⤊ 0⤋
How about this
http://www.carolina.com/life_science/pdfs/sea_urchin_anatomy_guide.pdf
2006-11-05 10:35:47 · answer #2 · answered by rscanner 6 · 0⤊ 0⤋