ZOO 2090 Lecture Notes - Lecture 1: Symmetry In Biology, Larvacea, Thyroid

• School: University of Guelph
• Department: Zoology
• Course: ZOO 2090
• Professor: Jinzhong Fu

Document Summary

Function: ancestry/inheritance, adaptation to new lifestyle or environment. Kingdom(cid:198)phylum(cid:198)class(cid:198)order(cid:198)family(cid:198)genus(cid:198)species: remember: king phillip came over for good spaghetti. The close relatives of the phylum chordata are: phylum echinodermata, phylum hemichordata, together these three phyla make up. Deuterstoma: with protostoma as its sister group. Filter feeding by pharyngeal filtration: no differentiated brain, special sense organs or heart, subphylum vertebrata (cid:198)note: (cid:862)uro(cid:863) (cid:373)ea(cid:374)s tail, many textbooks present the phylogeny as, but most recent data shows that the phylogeny is actually: Characters of chordates: notochord, at so(cid:373)e stage i(cid:374) the a(cid:374)i(cid:373)al"s life(cid:198)in most adult chordates the notochord disappears or becomes highly modified (function is taken over by the vertebral column in later forms, a fluid-filled elastic rod. In most vertebrates the major nerve cord is not hollow and runs ventrally below the gut: a pharynx with pouches or slits in its lateral walls/pharyngeal slits. Endostyle or thyroid gland: glanduar groove on the floor of the pharynx.