PHYLUM PLATYHELMINTHES (PLAT EE- HELL-MIN THEEZ) FLATWORMS A. THE MAJORITY OF FLATWORMS ARE PARASITES. B. THE GATEWAY PHYLUM TO THE REST OF THE ANIMAL KINGDOM. CNIDARIANS: RADIAL SYMMETRY TWO LAYERS
LACKING MOST ORGAN SYSTEMS. FLATWORMS: BILATERAL SYMMETRY THREE LAYERS CENTRALIZED NERVOUS SYSTEM SIMPLE EXCRETORY SYSTEM. COMPLEX REPRODUCTIVE SYSTEM. SIMPLE DIGESTIVE SYSTEM.
Phylum Platyhelminthes Flat Worms dorsoventrally (back to front) flattened swims by undulations of the body Flatworms are the simplest animals in which tissues are organized into real organs and organ systems This Phylums Advance Bilateral symmetry 3 tissue layers (ectoderm, mesoderm, endoderm) = triploblastic Cephalization formation of a head and Brain
Nerve ladder Still only one opening in the gut Cephalization Flat worm Simple yet Colorful You can see why they are called Flatworms Just a few Examples
The Biology of Flatworms Cephalization refers to the formation of a He ad an d an d
25% 25% M ou th 25% B ra in
Ta il 25% An us Head and Tail Head and Brain Anus Mouth
He ad A. B. C. D. Platyhelmithes is the first phylum to have. An us
25% An 25% s a ti on 25%
ha liz Ce p ne rv e ne t 25%
Ti ss ue A nerve net Cephalization Tissues An Anus A A. B. C.
D. Flatworms have ____ tissue layer(s). 25% 25% 4 25% 3 25%
2 1 2 3 4 1 A. B. C. D.
As ym m cia l 25% Sp a 25%
et ry 25% ia l 25% Ra d
Bilateral Radial Asymmetry Spacial Bi la te ra l A. B. C.
D. What type of Symmetry do Flatworms have? Fastest Responders Seconds Participant Seconds Participant
C. THREE CLASSES C. THREE CLASSES 1. TURBELLARIA MADE UP OF MOSTLY FREE LIVING FLATWORMS. CAN LIVE IN MARINE, FRESHWATER, AND DAMP TROPICAL ENV. EXAMPLES: PLANARIA AND POLYCLADIDS.
C. THREE CLASSES 2. TREMATODA KNOWN AS FLUKES. ALL ARE PARASITIC AND VERY DAMAGING. EXAMPLES: ASIAN LIVER FLUKE AND SCHISTOSOMES. C. THREE CLASSES 3. CESTODA KNOWN AS TAPEWORMS.
ALL ARE PARASITIC. EXAMPLES: PORK, BEEF, FISH, & DOG TAPEWORMS. D. THREE LAYERS 1. EPIDERMIS TOUGH (Outer Layer) 2. MUSCLE CIRCULAR AND LONGITUDINAL
3. MESENCHYME (Connective Tissue) E. NERVOUS SYSTEM SIMPLE BRAIN FOUND AT THE HEAD END. TWO NERVE CORDS THAT LOOK LADDER LIKE. F. EXCRETORY SYSTEM
CONTAINS FLAME CELLS. (THE CILIA LOOKS LIKE A FLICKERING FLAME) G. REPRODUCTIVE SYSTEM HERMAPHRODITIC . SEXUAL ONLY TAPEWORMS CAN POSSIBLY SELFFERTILIZE.
H. DIGESTIVE SYSTEM Class Feeding TUR B E L L A R IA N S F E E D ON SM A L L IN VE R TE B R A TE S C est odes F E E D ON H OST (IN TE STIN E OF A VE R TE B R A TE
A N IM A L ) Tr emat odes F E E D ON H OST TISSUE TH R OUGH P H A R Y N X. Digestion M o ut h is used f o r bo t h in gest io n & exc r et io n . M o ut h l eads t o ph ar yn x an d is f o l l o w ed by t he gut
P o ssess n o gut o r simpl e gut N o mo ut h o r digest ive t r ac t A bso r b f o o d f r o m en vir o n men t Digest io n is in t r ac el l ul ar C o n t ain mo ut h an d simpl e gut Digest io n is ext r ac el l ul ar an d t h en in t r ac el l ul ar H. DIGESTIVE SYSTEM 1. ONE OPENING THE MOUTH 2. PHARYNX AND INTESTINES. 3. TAPEWORMS DO NOT NEED A
DIGESTIVE SYSTEM. I. LIFE CYCLES TAPEWORM CP 25 I. LIFE CYCLES FLUKE CP 23 J. MISC. 1. THEY DO NOT HAVE A
CIRCULATORY SYSTEM OR A RESPIRATORY SYSTEM. USE DIFFUSION. J. MISC. 2. CONSIDERED ACOELOMATES BECAUSE THEY LACK A BODY CAVITY. 3. HAVE A HYDROSTATIC SKELETON. 4. THEY ARE REALLY FLAT!!!
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