Chapter 34 Section 1 Phylum Platyhelminthes. Structure & Function Bilateral symmetry Ectoderm,...
-
Upload
ursula-russell -
Category
Documents
-
view
256 -
download
4
Transcript of Chapter 34 Section 1 Phylum Platyhelminthes. Structure & Function Bilateral symmetry Ectoderm,...
![Page 1: Chapter 34 Section 1 Phylum Platyhelminthes. Structure & Function Bilateral symmetry Ectoderm, endoderm, mesoderm No hollow body cavity- acoelomate.](https://reader033.fdocuments.in/reader033/viewer/2022061616/5697bff61a28abf838cbe379/html5/thumbnails/1.jpg)
Chapter 34
Section 1Phylum Platyhelminthes
![Page 2: Chapter 34 Section 1 Phylum Platyhelminthes. Structure & Function Bilateral symmetry Ectoderm, endoderm, mesoderm No hollow body cavity- acoelomate.](https://reader033.fdocuments.in/reader033/viewer/2022061616/5697bff61a28abf838cbe379/html5/thumbnails/2.jpg)
![Page 3: Chapter 34 Section 1 Phylum Platyhelminthes. Structure & Function Bilateral symmetry Ectoderm, endoderm, mesoderm No hollow body cavity- acoelomate.](https://reader033.fdocuments.in/reader033/viewer/2022061616/5697bff61a28abf838cbe379/html5/thumbnails/3.jpg)
Structure & Function• Bilateral symmetry• Ectoderm, endoderm, mesoderm• No hollow body cavity- acoelomate• Gastrovascular cavity like cnidarians-
single opening• Sensory organs located at the anterior
end of body- cephalization
![Page 4: Chapter 34 Section 1 Phylum Platyhelminthes. Structure & Function Bilateral symmetry Ectoderm, endoderm, mesoderm No hollow body cavity- acoelomate.](https://reader033.fdocuments.in/reader033/viewer/2022061616/5697bff61a28abf838cbe379/html5/thumbnails/4.jpg)
Structure & Function • Four classes:• Turbellaria- free-living, non-parasitic• Trematoda- parasitic• Monogenea- parasitic• Cestoda- parasitic
![Page 5: Chapter 34 Section 1 Phylum Platyhelminthes. Structure & Function Bilateral symmetry Ectoderm, endoderm, mesoderm No hollow body cavity- acoelomate.](https://reader033.fdocuments.in/reader033/viewer/2022061616/5697bff61a28abf838cbe379/html5/thumbnails/5.jpg)
Class Turbellaria• Planarians• Arrow-shaped head• Most live in the ocean, some in
freshwater• Glide through the water using mucus
and propelled by cilia
![Page 6: Chapter 34 Section 1 Phylum Platyhelminthes. Structure & Function Bilateral symmetry Ectoderm, endoderm, mesoderm No hollow body cavity- acoelomate.](https://reader033.fdocuments.in/reader033/viewer/2022061616/5697bff61a28abf838cbe379/html5/thumbnails/6.jpg)
![Page 7: Chapter 34 Section 1 Phylum Platyhelminthes. Structure & Function Bilateral symmetry Ectoderm, endoderm, mesoderm No hollow body cavity- acoelomate.](https://reader033.fdocuments.in/reader033/viewer/2022061616/5697bff61a28abf838cbe379/html5/thumbnails/7.jpg)
Class Turbellaria• Digestion & Excretion• Scavengers- feed on dead and decaying
matter• Food is ingested by pharynx- runs
through middle of body• Use flame cells to get rid of extra water
since they are constantly taking in water.
![Page 8: Chapter 34 Section 1 Phylum Platyhelminthes. Structure & Function Bilateral symmetry Ectoderm, endoderm, mesoderm No hollow body cavity- acoelomate.](https://reader033.fdocuments.in/reader033/viewer/2022061616/5697bff61a28abf838cbe379/html5/thumbnails/8.jpg)
![Page 9: Chapter 34 Section 1 Phylum Platyhelminthes. Structure & Function Bilateral symmetry Ectoderm, endoderm, mesoderm No hollow body cavity- acoelomate.](https://reader033.fdocuments.in/reader033/viewer/2022061616/5697bff61a28abf838cbe379/html5/thumbnails/9.jpg)
Class Turbellaria• Neural control• More complex than cnidarians• Cerebral ganglia- simple brain
(cluster of nerve cells at anterior end)• Eyespots- organism can sense light
with these structures
![Page 10: Chapter 34 Section 1 Phylum Platyhelminthes. Structure & Function Bilateral symmetry Ectoderm, endoderm, mesoderm No hollow body cavity- acoelomate.](https://reader033.fdocuments.in/reader033/viewer/2022061616/5697bff61a28abf838cbe379/html5/thumbnails/10.jpg)
![Page 11: Chapter 34 Section 1 Phylum Platyhelminthes. Structure & Function Bilateral symmetry Ectoderm, endoderm, mesoderm No hollow body cavity- acoelomate.](https://reader033.fdocuments.in/reader033/viewer/2022061616/5697bff61a28abf838cbe379/html5/thumbnails/11.jpg)
Class Turbellaria• Reproduction• Hermaphrodites • Sexual reproduction- mate with other
planarians• Asexual reproduction-
regeneration/fission- body splits into two pieces
![Page 12: Chapter 34 Section 1 Phylum Platyhelminthes. Structure & Function Bilateral symmetry Ectoderm, endoderm, mesoderm No hollow body cavity- acoelomate.](https://reader033.fdocuments.in/reader033/viewer/2022061616/5697bff61a28abf838cbe379/html5/thumbnails/12.jpg)
Classes Trematoda & Monogenea
• Parasitic flukes- leaf-shaped flatworms that parasitize many kinds of animals, including humans• Tremadoes- wide range of hosts-
blood, intestines, lungs, liver, or organs• Monogeneans- ecto-parasites- fish
![Page 13: Chapter 34 Section 1 Phylum Platyhelminthes. Structure & Function Bilateral symmetry Ectoderm, endoderm, mesoderm No hollow body cavity- acoelomate.](https://reader033.fdocuments.in/reader033/viewer/2022061616/5697bff61a28abf838cbe379/html5/thumbnails/13.jpg)
Classes Trematoda & Monogenea
• Structure• Anterior & ventral sucker• No eye spots• External surface covering- tegument-
helps protect parasite when inside host
![Page 14: Chapter 34 Section 1 Phylum Platyhelminthes. Structure & Function Bilateral symmetry Ectoderm, endoderm, mesoderm No hollow body cavity- acoelomate.](https://reader033.fdocuments.in/reader033/viewer/2022061616/5697bff61a28abf838cbe379/html5/thumbnails/14.jpg)
Classes Trematoda & Monogenea
• Reproduction & Life Cycle• Hermaphroditic • Primary host- parasite gets
nourishment from• Intermediate host- host from which
the larvae derive their nourishment
![Page 15: Chapter 34 Section 1 Phylum Platyhelminthes. Structure & Function Bilateral symmetry Ectoderm, endoderm, mesoderm No hollow body cavity- acoelomate.](https://reader033.fdocuments.in/reader033/viewer/2022061616/5697bff61a28abf838cbe379/html5/thumbnails/15.jpg)
Classes Trematoda & Monogenea
• Reproduction & Life Cycle• Schistosomiasis- affects 200 million
people, mostly from Asia, Africa, & South America
![Page 16: Chapter 34 Section 1 Phylum Platyhelminthes. Structure & Function Bilateral symmetry Ectoderm, endoderm, mesoderm No hollow body cavity- acoelomate.](https://reader033.fdocuments.in/reader033/viewer/2022061616/5697bff61a28abf838cbe379/html5/thumbnails/16.jpg)
![Page 17: Chapter 34 Section 1 Phylum Platyhelminthes. Structure & Function Bilateral symmetry Ectoderm, endoderm, mesoderm No hollow body cavity- acoelomate.](https://reader033.fdocuments.in/reader033/viewer/2022061616/5697bff61a28abf838cbe379/html5/thumbnails/17.jpg)
Class Cestoda• Tapeworms• Live in intestines of vertebrates• Found in raw or undercooked food
containing eggs or larvae• Causes: weight loss, digestive
problems, lack of energy, etc
![Page 18: Chapter 34 Section 1 Phylum Platyhelminthes. Structure & Function Bilateral symmetry Ectoderm, endoderm, mesoderm No hollow body cavity- acoelomate.](https://reader033.fdocuments.in/reader033/viewer/2022061616/5697bff61a28abf838cbe379/html5/thumbnails/18.jpg)
![Page 19: Chapter 34 Section 1 Phylum Platyhelminthes. Structure & Function Bilateral symmetry Ectoderm, endoderm, mesoderm No hollow body cavity- acoelomate.](https://reader033.fdocuments.in/reader033/viewer/2022061616/5697bff61a28abf838cbe379/html5/thumbnails/19.jpg)
Class Cestoda• Structure• Tegument to protect from host
defence• Scolex- knob-shaped organ found at
anterior end of tapeworm- attaches worm to host
![Page 20: Chapter 34 Section 1 Phylum Platyhelminthes. Structure & Function Bilateral symmetry Ectoderm, endoderm, mesoderm No hollow body cavity- acoelomate.](https://reader033.fdocuments.in/reader033/viewer/2022061616/5697bff61a28abf838cbe379/html5/thumbnails/20.jpg)
Class Cestoda• Structure• Proglottids- long series of body
sections, as it grows it adds proglottids• Can grow up to 33 feet in some cases!• Lack eyespots, sensitive structure, no
mouth, no digestion
![Page 21: Chapter 34 Section 1 Phylum Platyhelminthes. Structure & Function Bilateral symmetry Ectoderm, endoderm, mesoderm No hollow body cavity- acoelomate.](https://reader033.fdocuments.in/reader033/viewer/2022061616/5697bff61a28abf838cbe379/html5/thumbnails/21.jpg)
![Page 22: Chapter 34 Section 1 Phylum Platyhelminthes. Structure & Function Bilateral symmetry Ectoderm, endoderm, mesoderm No hollow body cavity- acoelomate.](https://reader033.fdocuments.in/reader033/viewer/2022061616/5697bff61a28abf838cbe379/html5/thumbnails/22.jpg)
Class Cestoda• Reproduction & life Cycle• Hermaphrodites• Cysts- dormant larva with protective
covering
![Page 23: Chapter 34 Section 1 Phylum Platyhelminthes. Structure & Function Bilateral symmetry Ectoderm, endoderm, mesoderm No hollow body cavity- acoelomate.](https://reader033.fdocuments.in/reader033/viewer/2022061616/5697bff61a28abf838cbe379/html5/thumbnails/23.jpg)
![Page 24: Chapter 34 Section 1 Phylum Platyhelminthes. Structure & Function Bilateral symmetry Ectoderm, endoderm, mesoderm No hollow body cavity- acoelomate.](https://reader033.fdocuments.in/reader033/viewer/2022061616/5697bff61a28abf838cbe379/html5/thumbnails/24.jpg)
REVIEW!!!• Name the four classes and an example of
each from the Phylum Platyhelminthes.• What kind of nervous system does the
Class Turbellaria have?• Where do tapeworms originate from?
What Class can we find them in?