4a bio1130 organismal biology 79 universit dottawa

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Unformatted text preview: tem because the surfae to volume ration is good. no role for caelomic fluids misoderm replaces it. does not meant that they dont have ahydrostatic skeleton gliding movement so typical of latworms/cilia helps glide across substrate cilia used to prevent dislodgement tripoblast body removed feeding with muscular pharynx branched through entire body transfer of nutrients Flat worms (Platyhelminthes) Digestive system Pharynx Mouth Figure 25.16 BIO1130 Organismal Biology 80 Université d’Ottawa / University of Ottawa 2:25 PM complex reproductive system - hermaphrodite/ one individual, both sexual reproductive systems advantage of hermaphrodism in flat worms because - both parties walk away fertilized Flat worms (Platyhelminthes) Ovary Yolk glands Oviduct Seminal receptacle Genital pore Penis Testis Sperm duct Seminal vesicle BIO1130 Organismal Biology Figure 25.16 Université d’Ottawa / University of Ottawa BIO1130 Organismal Biology 81 2:25 PM -snails are also hermaphrodites - myotic mixing is ensured - any encounter produces fertilized individuals testes produces sperm- sperm runs down sperm duct into seminal vesicle two flat worms mate fertilized egg exits the organism invaded- perfect parasites Page 27 Phanerozic - Paleozoic Fluke Clonorchis Digestive and excretory systems Oral sucker Pharynx Ventral sucker (Acetabulum) Intestine Lateral excretory duct Excretory bladder Excretory pore BIO2135 Animal Form and Function 82 Université d’Ottawa / University of Ottawa 2:25 PM Fluke Clonorchis Reproductive systems Genital pore Uterus Yolk glands Mehlis gland (Ootype) Ovary Seminal receptacle Testes BIO2135 Animal Form and Function 83 Université d’Ottawa / University of Ottawa 2:25 PM Fluke Clonorchis Life cycle Miracidium (Free living) Adult Metacercaria Sporocyst Cercaria Redia (Free living) BIO2135 Animal Form and Function Université d’Ottawa / University of Ottawa BIO1130 Organismal Biology 84 2:25 PM Page 28 Phanerozic - Paleozoic ! Deuterostomia 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 ! (autapomorphies) • Blastopore becomes the anus • Enterocoelic coelom • Radial cleavage ! Echinodermata (Autapomorphies) • Pentaramous symmetry • Water vascular system • Mutable connective tissue ! 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 bilaterallly symetric larval stage returning to radial symmetry - must look at fossil forms to understand Starfish and relatives Adult radial symmetry BIO1130 Organismal Biology major group of deutorostomes return to type of radial symmetry-pentaradius Why is there a return to radial symmetry -original state/radial -cnidarians represent diplobastic radial organisms and echinoderms for triploblastic?? Larva bilateral symmetry Figure 34-2 Université d’Ottawa / University of Ottawa BIO1130 Organismal Biology 87 2:25 PM Page 29 Phanerozic - Paleozoic group of animals living on stock sat on substrate. develops stock and develops inverted umbrealla of arms and collects food particles falling /drifting through water column - origins of first echinoderms Starfish and relatives BIO1130 Organismal Biology 88 Université d’Ottawa / University of Ottawa 2:25 PM Water vascular system Madreporite Radial canal Ampulla Ring canal Tube feet BIO1130 Organismal Biology Figure 26.3 Université d’Ottawa / University of Ottawa 89 2:25 PM hydrolics of feet moving food/ to mouth returning to sessile existence food is grabbed before it hits sediments/ reason for success. Feet proprelling food. Hydrostatic skeletons used to propel animal across the ocean. - uses food gathering system and turns into locomotary system echinoderms- prey -bivavlve slurpee in clam or corals -regurgitates digestive enzymes and sweeps up nutrients An explanation for the Cambrian explosion Snowball earth Burrowing Shelled arms race Developmental – hox genes BIO1130 Organismal Biology Université d’Ottawa / University of Ottawa BIO1130 Organismal Biology 90 2:25 PM Page 30 Phanerozic - Paleozoic • Snowball earth • Slushball earth BIO1130 Organismal Biology Figure 20.9 91 Université d’Ottawa / University of Ottawa Early animal evolution 2:25 PM Burgess shale fossils 505 Ma Ediacara fossils 580-542 Ma Be sure to look at Knoll VR00314 for most recent...
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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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