Parazoa no true tissues

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