10 23 universit dottawa university of ottawa 225 pm

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Unformatted text preview: ocyst BIO1130 Organismal Biology Figure 25.10 23 Université d’Ottawa / University of Ottawa 2:25 PM Body wall – hydrostatic skeleton (Cnidaria) Mesoglea Gastrodermis Epidermis Nutritive cell Gland cell Circ. muscle Long. muscle BIO1130 Organismal Biology Cnidocyte Nerve cell Figure 25.9 Université d’Ottawa / University of Ottawa BIO1130 Organismal Biology 24 2:25 PM Also exist in polyc body lan gastula with single opening Mouth but no anus Dermis taht is involved with feeding and nutrition Gland cells secrete enzymes and absorb meal On surface are flagella- a miixing current is produced when cavity is closed At bae of cell is a seies of fibres when muscle contracts- there is no biochemical way for the muscle to return muscle to normal length- opposing muscle Skeleton helps contract muscle Skeleton is unique based on epithial muscle cells Nytocytes and nerve cells seen Page 8 Phanerozic - Paleozoic Jellyfish is medusa shaped In hydrostatic skeleton instead of using water we use jelly liek mesoglea. Unique swimming motion Polyp Cnidaria Mesoglea Medusa BIO1130 Organismal Biology 25 Université d’Ottawa / University of Ottawa 2:25 PM polyps divide and create branching strucure Jellyfish Gonozooid Female medusa Male medusa Gastrozooid Meiosis Sperm Egg Branching polyp Fertilization Zygote Developing polyp Planula larva Figure 25.11 26 2:25 PM Early plant like organism- Corals are little polyps but they are avble to extract calcium from thw ater and create a little cup from which they live. Corals ? Coral reefs are tropical reainforests of the ocean Corals modify oceans and allows other organisms to divesify in terms of structure and what they are doing Build-up of green house gases Death of coral due to temp changes. BIO1130 Organismal Biology Université d’Ottawa / University of Ottawa BIO1130 Organismal Biology 27 2:25 PM Page 9 Phanerozic - Paleozoic Coral reefs Polyp Skelton Figure 25.13 BIO1130 Organismal Biology 28 Université d’Ottawa / University of Ottawa 1 2 ! Animal innovations (Symplesiomorphies) 1. Triploblastic Mesodermal musculature 2. Bilateral symmetry 2:25 PM 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 Development of tripoblasty and misoderm Animal architecture Tissues Symmetry and cephalization Embryology 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 BIO1130 Organismal Biology 30 2:25 PM Page 10 Phanerozic - Paleozoic Animal world may be divided into two groups One group spirals, other group balances and sits on top of eachother Gastrulation- misoderm is formed and placed in between misoderm and endoderm Animal architecture Embryology - cleavage 4 cell embryo 8 cell embryo Spiral cleavage Radial cleavage BIO1130 Organismal Biology Figure 25.5a 31 Université d’Ottawa / University of Ottawa 2:25 PM Animal architecture Embryology - gastrulation Blastula Gastrula Ectoderm If blastopore become mouth-protostone IF occurs in second opening=deuterostone When misoderm appears withtin the organism- cells proliferate and form massive misoderm and split apart to form body cabity-> called schizocoel Endoderm Gut Blastopore BIO1130 Organismal Biology Figure 25.2 32 Université d’Ottawa / University of Ottawa 2:25 PM Ectoderm Animal architecture Embryology – coelom formation Mesoderm Endoderm Coelom 2 diffrent ways of filling with misoderm and endoderm Misoderm and body cavity is created gut is invaginaed- if cells start to proliferate off of a bud Gut (Archenteron) Schizocoel BIO1130 Organismal Biology Enterocoel Figure 25.5b Université d’Ottawa / University of Ottawa BIO1130 Organismal Biology 33 2:25 PM Page 11 Phanerozic - Paleozoic This gives us a sweet of characteres and divides the animal wor,d. Even at 8 cell- we know which branch or lineage an organism is heading down Protostomes vs deuterostomes Protostomes – Blastopore mouth – Spiral cleavage – Schizocoely Deuterostomes – Blastopore anus – Radial cleavage – Enterocoley BIO2135 Animal Form and Function 34 Université d’Ottawa / University of Ottawa 2:25 PM No body cavity-acoelomate Coelomate- fluid filled space filled with misoderm Fluid can be circulatory fluid(larger organism will need) or a hydrostatic skeleton WATCH PODCAST - pseudocoelomate- used in reproductive season- eggs and gonads partially lined gut with misoderm coelomate comes first- and is a derived trait Animal architecture Body cavities Acoelomate Pseudocoelomate Coelomate BIO1130 Organismal Biology 35 Université d’Ottawa / University of Ottawa 2:25 PM Ectoderm Animal architecture Mesoderm Body cavities - Acoel...
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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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