Acoelomate endoderm special adaptation in how it

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Unformatted text preview: omate Endoderm special adaptation in how it lives opening Coelom Epidermis Gut Internal organs Body wall BIO1130 Organismal Biology Figure 25.4a Université d’Ottawa / University of Ottawa BIO1130 Organismal Biology 36 2:25 PM Page 12 Phanerozic - Paleozoic Ectoderm Animal architecture no misoderm/endoderm association Mesoderm Body cavities - Pseudoelomate Endoderm Coelom Epidermis Gut Pseudocoelom Body wall Internal organs Figure 25.4b BIO1130 Organismal Biology 37 Université d’Ottawa / University of Ottawa 2:25 PM Ectoderm Animal architecture Mesoderm Body cavities - Coelomate Endoderm Coelom Epidermis Coelom Body wall Internal organs Gut BIO1130 Organismal Biology Figure 25.4c 38 Université d’Ottawa / University of Ottawa ! ! Protostomia (autapomorphy) • Blastopore is mouth, • Spiral cleavage • Schizocoelus 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 BIO1130 Organismal Biology 3 major groups prototones divided \ Page 13 Phanerozic - Paleozoic Food particles Three main protostome groups Water current Mouth Ecdysozoa Lophotrochozoa Anus Gut – Lophophore or – Trochophore larval stage Platyzoa Mouth Cilia used in locomotion and feeding Anus Figure 33-5 Figure 25-23 BIO1130 Organismal Biology 40 Université d’Ottawa / University of Ottawa 2:25 PM 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 Kinorhyncha Chordata 3 2 Protostome taxa 1• 2• 3• ! 1 Ecdysozoa Lophotrochozoa Platyzoa Symplesiomorphies 1. Collagenous cuticle without microvilli Longitudinal but no circular muscles 2. Epitheliomuscular pharynx 1 2 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 BIO1130 Organismal Biology Why are these advantages ridden if they are so avantageous lophotrochozoa- no common morphology arthropods inscts shrimp spiders-exoskeleton 3-platyzoa- molt ot undergo egdycis ecdysozoa- nemotodes arthropoda(90% of knows species of organism, actaly insects) cuticle covering epidermissurface of epithilium is often ciliated/ does not happen between patricular group reinforcing fibre- importatn because they are made of collagen epithilial musculature cells extremely small organisms no everyevolutionary strategy is to becom big Page 14 Phanerozic - Paleozoic Animal architecture Tissues – None, diploblastic, or triploblastic Symmetry and cephalization – Asymmetry, radial, and bilateral symmetry Embryology – Protostome and deuterostome Body cavities – Coelomate, pseudocoelomate, acoelomate BIO1130 Organismal Biology 43 Université d’Ottawa / University of Ottawa 2:25 PM Ectoderm Animal architecture Mesoderm Body cavities - Pseudoelomate digestive tract with no misoderm associated and muscle associated with outer wall Endoderm Coelom Epidermis Gut Pseudocoelom Body wall Internal organs Figure 25.4b BIO1130 Organismal Biology 44 Université d’Ottawa / University of Ottawa 2:25 PM muscle arranged around outside - animal minimizing size relying on elasticity of cuticle to spring back to shape Nematoda Intestine nematodes- whipping to move along the sole grains werent free swimmers/not effective that is whre the most abundance is no idea how many species there are nervous system is reduced muscle extends own arms to central nervous system Pseudocoel Gonad Epidermis Muscle Cuticle Nerve cord BIO1130 Organismal Biology Figure 25.34 Université d’Ottawa / University of Ottawa BIO1130 Organismal Biology 45 2:25 PM Page 15 Phanerozic - Paleozoic longitudinal muscles/ no muwcle connections between system Ascaris body wall detail muscles always contracting group develops special valve in how it feeds - there are two valves Nucleus Protoplasmic extension Nerve cord Contractile muscle element BIO1130 Organismal Biology 46 Université d’Ottawa / University of Ottawa 2:25 PM in 2 valve system- valve in the back closes vice versa Specializes in miniturization contractile elements in epithilial cells epithilial muscle cells* Epitheliomuscular pharynx Pharynx bulb Pharynx Excretory canal BIO1130 Organismal Biology 47 Université d’Ottawa / University of Ottawa 2:25 PM biomechanically- 3 side opening most effective Triradiate pharynx Pharyngeal muscles Pharyngeal lumen Longitudinal muscle Cuticle life cycle- amoeboid sperm simplifiez systems unknow role specialized in miniturization collagenous cuticle epithial muscles Pse...
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