Make-up Exam notes - General Info Body Wall/Support...

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Unformatted text preview: General Info Body Wall/Support Locomotion Feeding/Digestion Circulation/Gas Exchange/Excretory Nervous System Reproduction Phylum Platyhelminthes Biological 1 st : 3 rd germ layer, chephalization, fw & terrestrial species, discrete organ systems, segmentation; 1 st appearance of excretory system Triploblastic; acoelomate; bilateral symmetry Incomplete gut (absent in cestoda) Protonephridia; no circulatory system Cephalized; anterior cereb. Ganglion, usually long. Nerve cords (ladder-like) Spiral cleavage; hermaphroditic Class Turbellaria Acoels very primitive; planuloid ancestor (externally ciliated, shape change, mouth appeared, bilateral streamlining Epidermis: epithelium w/ cilia and gland cells; basement membrane for struct. support (not in acoela) w/ smooth muscle cells inside; gland cells: produce mucus; rhabdoids: release causes mucus formation; rhabdites: rhabdoids produced by gland cells (defense); tubercles: defense Benthic: cilia- powered gliding w. mucus Forward movt: transverse furrows and ridges move as waves Swimming: muscular undulations Most carnivourous or scavengers; few herbivorous-locate by chemoreception; Mouth->pharynx-> intestine; Pharyngeal glands in pharynx prod mucus for feeding/swallowing; 3 Types: simple- short ciliated tube, feed by sweeping of cilia, eversible (nemerto, acoela); bulbous-muscular, protractile (rhabdocoels); plicate- ruffled in poly- and cylind. in triclads, protrudes by pharyngeal muscles, retractor pull back in; Diverticula; Protonephridia (except nemerto and acoela) for osmoregulation Most waste lost thru diffusion-Simple: netlike, concent in head -bilateral arrange., cerebral gang., long. Nerve cords connected by transverse commissures, Tactile receptors: around pharynx; Chemoreceptors: find food, on sides of head; Cilia: receive info from environ.; Rheoreceptors: orient to water movt, on side of head; Statocysts: near c.g; Photoreceptors: ocelli; Neurosecretory cells: regenerat., asex reprod. Asexual: transverse fission Sexual: hermaph Males: testes Female: entolecithal ova (nemerto, acoela, poly, macro), spiral; ectolecithal (rhabdocoela, tri) Sperm transfer thru cirrus by muscular action of cirrus Intestine-nutritive cells General Info Body Wall/Support Locomotion Feeding/Digestion Circulation/Gas Exchange/Excretory Nervous System Reproduction Phylum Platyhelminthes Biological 1 st : 3 rd germ layer, chephalization, fw & terrestrial species, discrete organ systems, segmentation; 1 st appearance of excretory system Triploblastic; acoelomate; bilateral symmetry Incomplete gut (absent in cestoda) Protonephridia; no circulatory system Cephalized; anterior cereb. Ganglion, usually long. Nerve cords (ladder-like) Spiral cleavage; hermaphroditic Tapeworms and Flukes Tapeworms: Most in Eucestoda 3 parts: Scolex, Neck, Strobila Cestodes lack scolex, proglottids, and digestive tract 3 types of suckers:-Bothria: long, longitudinal grooves on scoles, weak muscles,; single pair-Bothridia: 4 symm....
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This test prep was uploaded on 04/19/2008 for the course ZOO 3205 taught by Professor Pierce during the Spring '08 term at University of South Florida - Tampa.

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Make-up Exam notes - General Info Body Wall/Support...

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