Types of skeleton. Prepared By : Sadia khurshid Lecturer , Zoology Department DA Degree College for Women, Phase VIII . Content. INTRODUCTION TYPES OF SKELETON HYDROSTATIC SKELETON EXOSKELETON ENDOSKELETON FACTS REFERENCES. The Skeletal System.
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Prepared By :
Lecturer , Zoology Department
DA Degree College for Women, Phase VIII
The system which is consist of supporting tissues. This is to protects the body or a part of body and play an important role in animal’s physiology.
Fig.1. human skeleton
Fig. 2.JELLY FISH
Fig. 3. jelly fish
Octopus octopus marginatus
The anemone can elongate or contract its body by contracting one or the other set of muscles.
FIG. 6 sea anemone
Fig. 7 Earth worm
Successive peristaltic waves begin at the front and move towards the end of the body
Fig. 8 Movement of earth worm
Fig. 9 Octopus
Fig. 10 An insect
Fig. 11 Difflugia
testate amoebae or Arcellinida, usually found in freshwaters
A key characteristic of Arcella is the circular test with a hole on its center from where finger-like pseudopods emerge. It is one of the largest testacean genera.
FIG. 12 Arcella
Foraminifera (forams for short) are single-celled protists with shells. Their shells are also referred to as tests because in some forms the protoplasm covers the exterior of the shell.
Fig. 13 A typical foram : In the inside which the foram lives. Radiating from the picture about, the dark brown structure is the test, or shell, opening are fine hair like reticulopodia, which the foram uses to find and capture food.
Fig. 14 Cnidarians
Fig. 15 Shell of Mollusc
3. Splitting of old exoskeleton
1. Secretion of enzyme, removal of endocuticle & separation of skin from the exoskeleton
4.Hardening of new exoskeleton by deposition of calcium carbonate
2. Formation of new epicuticle & procuticle.
Step 1 (cicad)
Fig. 17 Endoskeleton
Fig. 18 Spicules
Fig. 19 Ossicle of star fish