BIO 200 Lecture Notes - Lecture 19: Chiton, Mollusca, Cephalopod

• School: University at Buffalo
• Department: Biological Sciences
• Course: BIO 200
• Professor: Dr.Poulin

Document Summary

Lophotrochozoans: part 2 (mollusks: mollusks are highly diverse. 3 body plan led to incredible variation and diversity. Thickened sheet of skin on dorsal part that covers respiratory. organs. , used o secrete a shell. Have specialized mouthpart called radula: mollusk reproduction. Cross-fertilization is common: there are four classes of mollusks ecdysozoans. Polyplacophora: the chitons (~1000 species: bodies (cid:449)ith eight do(cid:396)sal plates, he(cid:396)(cid:271)i(cid:448)o(cid:396)ous, t(cid:455)pi(cid:272)all(cid:455) li(cid:448)e i(cid:374) shallo(cid:449) (cid:449)ate(cid:396) Gastropoda: snails and slugs (~85,000 species: so(cid:373)e (cid:272)(cid:396)eep & othe(cid:396)s f(cid:396)ee s(cid:449)i(cid:373, te(cid:374)ta(cid:272)les (cid:272)o(cid:373)(cid:373)o(cid:374) (cid:894)e(cid:455)es a(cid:374)d (cid:272)he(cid:373)o o(cid:396) (cid:373)e(cid:272)ha(cid:374)ose(cid:374)si(cid:374)g(cid:895) *nudibranchs are very active species, use poison to protect themselves from predation. *are often brightly colored to warn predators-aposematic coloration. Bivalvia: bivalves (~30,000 sp: liga(cid:373)e(cid:374)t holds shells (cid:272)losed, most filte(cid:396) feed, e(cid:454)t(cid:396)a(cid:272)t passi(cid:374)g o(cid:396)ga(cid:374)is(cid:373)s, ha(cid:448)e i(cid:374)(cid:272)u(cid:396)(cid:396)e(cid:374)t a(cid:374)d e(cid:454)(cid:272)u(cid:396)(cid:396)e(cid:374)t s(cid:455)pho(cid:374)s, sede(cid:374)ta(cid:396)(cid:455) adults, f(cid:396)ee s(cid:449)i(cid:373)(cid:373)i(cid:374)g larvae. Ecdysozoans grow by molting, have a hard exoskeleton that sheds when they grow. *they are found everywhere: pseudo(cid:272)oelo(cid:373)ates, t(cid:455)pi(cid:272)all(cid:455) pa(cid:396)asiti(cid:272, sepa(cid:396)ate se(cid:454)es, h(cid:455)d(cid:396)ostati(cid:272) skeleto(cid:374)