BIOL108 Lecture Notes - Lecture 28: Central Nervous System, Symmetry In Biology, Bilateria
12 Nov 2018
School
Department
Course
Professor
BIOL108 verified notes
28/41View all
Document Summary
Indirect development: intervening stages (larvae) whose morphology and behaviour differs greatly from sexually mature adult stage. E. g. , caterpillar (cid:0) butterfly: both types of development evolved many times in different taxa, sponges vs. the rest . In the metazoa (animals), there are animals without true tissues (the sponges or. In the eumetazoa, the blastula undergoes gastrulation, forming a gastrula with different layers of embryonic tissues. Deutorostome development are in the deuterostomia : protostomes: first invagination (inlet) of the gastrula (blastopore) becomes the mouth, proto= first, stoma= mouth, deuterostomes: second invagination becomes the mouth. Lecture # 28 topic 8- animals: on coelomates, pseudocoelomates, and acoelomates, coeloms independently gained and lost (evolutionarily) in different triploblastic animal lineages, so cannot be definite about which taxa are which, but can generally give: Acoela as a group considered acoelomate (go figure) as well as the. Annelida (earthworms) as coelomates (and us, too!)
