CAS BB 191 Lecture Notes - Lecture 10: Radial Nerve, Tube Feet, Madreporite

• School: Boston University
• Department: Biochemistry & Molecular Biology
• Course: CAS BB 191
• Professor: Spooner

Document Summary

Internal: coelom: perivisceral coelom + water-vascular system, water-vascular system: Madreporite > stone canal > ring canal and polian vesicles > radial canals > lateral canals > ampulla (tube feet: unique to echinoderms, used for locomotion, food, respiration and excretion, digestion: Mouth > two part stomach (lower cardiac stomach > upper pyloric stomach) > digestive ceca in arms > intestine > anus. Class ophiuroidea: brittle stars: arms sharply marked off from central disc, ambulacral grooves closed, covered by ossicles, tube feet without suckers, pedicellariae and papulae absent, articulated ossicles called vertebrae, jaws, sac-like stomach, no intestine, bursa for gas exchange. Class echinoidea: sea urchins, sand dollars: globular shape, no arms, compact skeleton of closely fitting plates, movable spines, ambulacral grooves closed, pedicellariae present, jaw structure called aristotle s lantern. Class holothuroidea: sea cucumbers: oral tentacles, ambulacral grooves closed, pedicellariae absent, madreporite internal, eviscerate. Class crinoidea: sea lilies and feather stars: branched arms, pinnate, sessile, body on stalk.