8 14 universit dottawa university of ottawa 225 pm

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Unformatted text preview: Spongocoel Choanocyte BIO1130 Organismal Biology Figure 25.8 14 Université d’Ottawa / University of Ottawa 2:25 PM General morphology of a cell move enironment through them choanocytes are all organized in a layer*** All arranged in "choanoderm" food is trapped and ingested by fagocytosis penacocytes- penacoderm 3 different cell types- meeting division of labor criteria Choanocytes have to supply with nutrients amoeiboid cell delivers t all different cell types present morphology is unique and works so well that the sponges spicules support sponges- made out of protein- may also be made out of glass or calcium totipotency- only once cell that has flagellum this cell becomes sperm Cloud of sperm released and accepted by other spnge Wandering archaeyte Instead ofdigesting it is pass to wandering ameobocyte and egg is fertilized Cells are not attached to the function that they have amoebocyte-sponge stemm cell commitment ot being one function is not there Every cell is a potential stem cell Sponge sex 30 some odd phyla is one a sub sampling of what was present in burgess shales -All of these phyla appear in the blink of an eye loking at the time scale that we have Right a tvery bottom is organism that uses choanocytes to pump water in system/ by definition they are animals-cells are not tissues yet. Cells are not gluesd together with only collagen but also with prions? Choanoctyes become sperm Archeocytes (sponge stem cells) form egg http://www.waterexplorer.com/il_cool102.htm BIO1130 Organismal Biology Figure 25.7 Université d’Ottawa / University of Ottawa BIO1130 Organismal Biology 15 2:25 PM Page 5 Phanerozic - Paleozoic 1 2 ! Animal innovations (Symplesiomorphies) 1. Gap (Septate) junctions Loss of the choanocyte 2. True tissues with all components Internal digestive epithelium Oral-aboral axis and symmetry Porifera Placozoa Cnidaria Ctenophora Platyhelminthes Gastrotricha Gnathostomulida Cycliophora Syndermata Annelida Mollusca Sipuncula Nemertea Brachiopoda Phoronida Bryozoa Arthropoda Tardigrada Onychophora Nematomorpha Nematoda Priapulida Kinorhyncha Loricifera Echinodermata Hemichordata Chordata story is that Animal architecture Symmetry and cephalization Embryology No multicellular plants in ocean story of animal evolution Tissues Moving along trees, the simplesiomorphies Basement membranes and new type of digestive epithilium choanoderm s feeding layer but it is replaced with epithiliumwhat do cnidaria do at this point Body cavities – None, diploblastic, or triploblastic – Asymmetry, radial, and bilateral symmetry – Protostome and deuterostome – Coelomate, pseudocoelomate, acoelomate BIO1130 Organismal Biology Université d’Ottawa / University of Ottawa 17 2:25 PM signals moving through cells Gap (septate) junctions (Connexon) BIO2135 Animal Form & Function Université d’Ottawa / University of Ottawa BIO1130 Organismal Biology 18 2:25 PM Page 6 Phanerozic - Paleozoic Animal architecture: Tissues No tissues Diploblastic germ layers – Ectoderm and endoderm Triploblastic germ layers – Ectoderm, mesoderm and endoderm BIO1130 Organismal Biology 19 Université d’Ottawa / University of Ottawa 2:25 PM General sequenc-zygot divides and bastuli is present theses cells are new endoderm cells punching in through cell a new set of ells endoderm is a digestive epithelum process is named gastrulation outer epithilium and inner digestive epithelium group frozn in time that inherits these characteristices Gastrulation - digestive epithelium Ectoderm Archenteron Endoderm BIO1130 Organismal Biology Université d’Ottawa / University of Ottawa 20 2:25 PM Animal architecture Symmetry and cephalization Assymetric Radial symmetry Bilateral symmetry and cephalization Figure 25.3 BIO1130 Organismal Biology 21 2:25 PM Page 7 Phanerozic - Paleozoic Porifera Placozoa Cnidaria Ctenophora Platyhelminthes Gastrotricha Gnathostomulida Cycliophora Rotifera Annelida Mollusca Sipuncula Nemertea Brachiopoda Phoronida Bryozoa Arthropoda Tardigrada Onychophora Nematomorpha Nematoda Priapulida Kinorhyncha Loricifera Echinodermata Hemichordata Chordata ! ! Cnidaria (Autapomorphies) • Cnidocytes • Polyp body plan • Epitheliomusculature cnidarians known as jellyfish and corals taking this luggage and improve with things they do uniquely Special type of epitheal cell- movement without muscles contractions are possible origins of cnidaria-cnidocytes......etc Special organelle- nematocyst is under impression if trigge fires, this stucture shoots out in G forces cntaining poision and jellyfish Cnidocytes (Cnidaria) Barbs Cnidocil Nemat...
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This note was uploaded on 01/14/2014 for the course BIO 1130 taught by Professor Fenwick during the Fall '08 term at University of Ottawa.

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