Platyhelminthes - PowerPoint PPT Presentation

Loading...

PPT – Platyhelminthes PowerPoint presentation | free to download - id: 6e477-MWFkO



Loading


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation
Title:

Platyhelminthes

Description:

Systems 1 (Integumentary, Skeletal, Muscle and Digestive) Systems 2 (Excretory, Respiratory, Circulatory, and Nervous) ... Juveniles in flea and louse ... – PowerPoint PPT presentation

Number of Views:722
Avg rating:3.0/5.0
Slides: 20
Provided by: jennah
Learn more at: http://biology.uco.edu
Category:

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: Platyhelminthes


1
Platyhelminthes
2
Contents
  • Position in animal kingdom
  • Taxonomy
  • Some unique characteristics
  • Systems 1 (Integumentary, Skeletal, Muscle and
    Digestive)
  • Systems 2 (Excretory, Respiratory, Circulatory,
    and Nervous).
  • Systems 3 (endocrine and Reproductive)
  • Class Turbellaria
  • Class Trematoda
  • Class Cestoda

3
Platyhelminthes
  • Eumetazoa - animals with tissue
  • Bilateria - have bilateral symmetry and are
    triploblastic.
  • Protostomia - a group of animals whose mouth
    develops from the blastopore, and the mesoderm
    forms from an area near the blastopore.
  • Acoelomata - They have a true mesoderm which
    fills the original blastocoel between the outer
    epidermis and digestive tract.

4
Taxonomy
Contents
  • Class Turbellaria (tur-bell-er-e-a)
  • Dugesia
  • Class Monogenea (mon-o-gin-e-a)
  • No representatives
  • Class Trematoda (trim-a-toe-da)
  • Clonorchis, Fasciola, Schistosoma
  • Class Cestoda (ces-toe-da)
  • Taenia, Dipylidium Echinococcus

5
Some Unique Characteristics
Contents
  • Proglotids and scolex in Cestoda
  • Rabdites in Turbellaria
  • Combination of characteristics- flame cells and
    being acoelomates for example.
  • Larva of each class are unique

6
Systems 1
  • Integumentary- Rhabdites and one cell layer
    epidermis in Turbellaria and usually ciliated
    syncytial tegument in other classes.
  • Skeletal - hydrostatic
  • Muscle - longitudinal, transverse, and circular
    muscles are present.
  • Digestive - incomplete with intracellular and
    extracellular digestion no system in Cestoda.

7
Systems 2
Contents
  • Excretory - flame cells, or excretory tubes in
    Cestoda.
  • Respiratory - no system, diffusion
  • Circulatory - none, diffusion.
  • Nervous - anterior ganglia, ventral ladder-like
    system (two lateral cords with transverse cords).

8
Systems 3
Contents
  • Endocrine - hormones produced by nervous system
  • Reproductive - monoecious in most
  • Well developed reproductive organs, mostly
    internal fertilization.
  • Two of the parasitic classes have complex life
    cycles
  • Trematoda - miracidium, sporocyst, redia,
    cercaria, metacercaria (usually snail is
    secondary host.
  • Cestoda - oncosphere, cystercercius (bladderworm)

9
Class Turbellaria
Contents
  • Planaria -Free-living flatworms with soft
    flattened bodies covered with ciliated epidermis
    which has special secreting cells called rabdites.

Dugesia
10
Class Trematoda
Contents
  • Flukes -oral and ventral suckers, no hooks,
    parasites, body with a syncytial tegument without
    cilia. Larva stages unique.
  • Clonorchis
  • Fasciola
  • Schistosoma

11
Clonorchis
Contents
  • Human liver fluke - has two intermediate or
    secondary host snail and fish.

12
Fasciola
Contents
  • Sheep liver fluke - metacercaria on grass.

Life cycle
13
Fasciola life cycle
Contents
14
Schistosoma
Contents
  • Blood Flukes
  • Cerceria usually infect by burrowing through skin.

15
Class Cestoda
Contents
  • Tapeworms
  • Have distinct head structure (Scolex) and
    reproductive units called proglottids. Do not
    have a digestive system.
  • Larva are oncospheres and cysticerci (bladder
    worms)
  • Taenia
  • Dipylidium
  • Echinococcus

16
Taenia
Contents
Proglotid
17
Dipylidium (dog tape)
Contents
  • Juveniles in flea and louse
  • Note the two gential pores and reproductive
    systems in each proglottid.

18
Echinococcus
Contents
  • Hydatid cyst (cysticercus)- may scolices and
    enlarges to as large as a basketball. Often
    called sand.
  • Only three proglottids

19
End of Presentation
About PowerShow.com