Parazoa no true tissues Eumetazoa Multicellula rity Radiata Bilateri a
Jan 19, 2016
Parazoano true tissues
Eumetazoa
Multicellularity
Radiata Bilateria
1. What is the literal meaning of Platyhelminthes?
2. A muscular tube used to suck food into the gastrovascular cavity.
3. Platyhelminthes depend on what process to respire?
4. What is the term used to describe the three germ layers?
5. True or False: Platyhelminthes can be parasitic.
with tissues organ systems
triploblastic bilaterally-
symmetric with
cephalization
acoelomates
Marine flatworms of the Philippinesfrom http://www.rzuser.uni-heidelberg.de/
Pseudobiceros bedfordiPseudobiceros bedfordi
Acanthozoon Acanthozoon sp.sp.
Pseudocerus sapphirinusPseudocerus sapphirinus
Phrikoceros sp.Phrikoceros sp.
carnivores or detritivores
incomplete digestive system highly-
branched GVC
pharynx external
internal digestion, diffusion
http://www.southtexascollege.edu/nilsson/4_GB_Lecture_figs_f/4_GB_23_AnimaliaInvert_Fig_f/Platyhelminthes_Planaria_2.GIF
feed on blood, tissue fluids, pieces of cells within host
no need for complex digestive system Clonorchis
sinensis (human liver fluke)
Taenia saginata (beef tapeworm)
http://www.esu.edu/~milewski/intro_biol_two/lab__10_platy_nemat/images/clonorchis.jpg, http://www.microbeworld.org/images/stories/twip/clonorchis_lifecycle.jpg
diffusion
flame cells - remove nitrogenous metabolic wastes and excess H2O
http://faculty.uca.edu/johnc/PlanarianPronephr.gif
ganglianerve cords (ladder-like)
eyespotssensory cells
MusclesVentral epidermal cilia + mucus
http://mlitvaitis.unh.edu/K-12Primer/muscles.jpg
FREE-LIVING•FISSION AND REGENERATION•HERMAPHRODITISM AND CROSS-FERTILIZATION
http://images.tutorvista.com/content/reproduction/fragmentation-in-planaria.jpeg, http://users.design.ucla.edu/~tatsuyas/classes/152BC/ex3/planaria.jpg, http://www.visualdiving.com/pics/uw962_35.jpg
PARASITICCOMPLEX LIFE CYCLES WITH BOTH ASEXUAL AND SEXUAL REPRODUCTION(Schistosoma japonicum)
http://siera104.com/images/bio/flatroundrotifers/shistomsoma.jpg
http://www.e-cleansing.com/wp-content/uploads/2009/12/laiuss1.jpg
Long, flat, parasitic worms
Structure Scolex: head w/ suckers,
hooks Proglottids: body segments
that produce both sperm and egg
http://www.ohiohealth.com, http://www.marlin.ac.uk/images/taxonomy_descriptions/Cestoda.jpg
http://www.dpd.cdc.gov/dpdx/images/ParasiteImages/S-Z/Taeniasis/Taenia_LifeCycle.gif
with tissues organ systems
“tube within a tube”
triploblastic bilaterally-
symmetric with cephalization pseudocoelomate
shttp://mycozynook.com/18_3bodyplanp.jpg ,
http://sharon-taxonomy2009-p2.wikispaces.com/file/view/nematode.gif/99304909/nematode.gif
carnivores/ detritivores or parasites complete digestive system internal digestion, diffusion http://images.tutorvista.com/content/animal-
kingdom/roundworm-anatomy.jpeg
diffusion through epidermis and cuticle with an excretory canal and pore
http://images.tutorvista.com/content/animal-kingdom/roundworm-anatomy.jpeg
circular nerve ring primitive braindorsal and ventral nerve cords
muscleshydrostatic skeleton
http://www.baileybio.com/plogger/images/ap_biology/animal_diversity_project_-_must_cite_your_textbook_/nematoda_2.jpg
SEXUAL: INTERNAL FERTILIZATION
ASEXUAL: PARTHENOGENESIS
unfertilized egg develops into an adult organism without sperm fertilization
http://sharonapbio-taxonomy.wikispaces.com/file/view/nematode.jpg/50864359/nematode.jpg,
http://www.mansfield.ohio-state.edu/~sabedon/black11_files/image023.jpg
PARASITICCOMPLEX LIFE CYCLES (Trichinella spiralis)
http://siera104.com/images/bio/flatroundrotifers/shistomsoma.jpg
PARASITICCOMPLEX LIFE CYCLES
Filarial worms(Brugia malayi)•threadlike•blood and lymph vessels of birds and mammals•vector: biting insects•with symbiotic bacteria Wolbachia
PARASITICCOMPLEX LIFE CYCLES
Ascaris spp.•causes malnutrition in >1B people
http://www.metapathogen.com/IMG/ascaris-life-cycle.png
PARASITICCOMPLEX LIFE CYCLES
Hookworms•Infects ~1/4 of the world’s population