Biology 3484A/B Lecture Notes - Lecture 17: Hemoglobin, Notochord, Pteropoda

• School: Western University
• Department: Biology
• Course: Biology 3484A/B
• Professor: Tim Hain

Document Summary

Animals ii: diversity of invertebrates: examples include: flatworms, slugs, starfish (deuterostomes, like us in chordates) And yet: yet, all of them here look like worms, very familiar earthworm, nematodes, molluscs (like sea slugs), and nemertean (a parasite) Most a(cid:374)i(cid:373)als are (cid:448)ariatio(cid:374)s o(cid:374) the (cid:449)or(cid:373) (cid:862)the(cid:373)e(cid:863: they have a mouth, anus, and complicated stuff in the middle, mouth either forms first or later, but all variation of gut and feeding holes, and stuff around them. Species diversity by taxon: arthropods make up about 1. 2 million species most diverse group, this includes molluscs, chordates, nematodes, and the phylum cnidaria (all the corals that we have) Cnidaria reproduction cycle: they go from the stationary polyp forms and can go in two ways to reproduce, a. The anthozoan (cid:894)(cid:449)hi(cid:272)h a(cid:396)e the (cid:272)o(cid:396)als(cid:895) do(cid:374)"t go th(cid:396)ough the medusa (which is the pre-swimming stage) instead they produce gametes directly, get fertilized, produce larva, which will grow to form more polyps: b.