Platyhelminthes

Quick Quiz: How long are the longest flatworms?

<http://clean-water.uwex.edu/pubs/clipart/critters.plan.htm>

Eugene Lee, Hyun Seok Lee

What Are Platyhelminthes?

Named because their bodies are thin between the dorsal and ventral surfaces

Platyhelminth

Eugene Lee

Sample Animal: Blood Fluke

Blood Fluke (Schistosoma Mansoni)

Trematoda

Schistosomiasis, a disease whose symptoms include pain, anemia, and dysentery.

<http://georgiafaces.caes.uga.edu/graphicsfiles/LandPlanarian33hr.jpg>

Eugene Lee

Sample Animal: Pseudoceros dimidiatus

Turbellaria

Yello/Black Stripes with Orange Edge

Found in Indo-Pacific, Red Sea

<http://www.waterworxbali.com/Images/Photos/Large/pseudoceros-dimidiatus.jpg>

Eugene Lee

4 Classes of Platyhelminthes

Turbellaria

Monogenea

Trematoda

Cestoda

<http://img2.scoop.co.nz/stories/images/0304/eec6749f6646c81b6298.jpeg>

Schistosoma(Blood flukes)

Hyun Seok Lee

Body Symmetry/Cavity

<http://www.daveharasti.com/nelsonbay/seaslugs/flatworms/callioplana_marginata.jpg>

Callioplana marginata

None. No Skeletal System!

Eugene Lee

Locomotion/Musculature

Uses Cilia on their ventral epidermis

Some other turbelarians use their muscles

Hyun Seok Lee

Nervous System

Eyespots (Sensory

Structure)

Ventral Nerve Cords

Ganglia <http://kdhellner.tripod.com/id17.html>

Eugene Lee

Excretory/Digestive System

Simple excretory apparatus

A combination digestive/excretory system

<http://kdhellner.tripod.com/id17.html>

MouthHyun Seok Lee

Circulatory System

Gastrovascular cavity

Eats small worms, insects, and microscopic matter

Eugene Lee

Reproduction

Hermaphroditic

<http://highered.mcgraw-hill.com/sites/dl/free/0078664276/281029/ccq_ch12_q4a.gif>

Hyun Seok Lee

Gas Exchange

Diffusion

<http://1.bp.blogspot.com/_8S5FnilQeWM/R02wga5Iy0I/AAAAAAAAAA8/CGecy2kqb9Q/s320/48842.jpg>

Hyun Seok Lee

QuizWhat processes are occurring during gas exchange and excretory system?

How do flatworms reproduce? Through what process?

How do flatworms carry out excretory and digestive system?

Name 4 classes of Platyhelminthes

Hyun Seok Lee, Eugene Lee

Answers:

Diffusion

Asexually

Through pharynx/Vastrovascular cavity

Turbellaria, Monogenea, Tremattoda, Cestoda

Hyun Seok Lee, Eugene Lee