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Journal of Experimental Biology 45,197-202 (1966)
Published by Company of Biologists 1966

Changes of Internal Hydrostatic Pressure and Body Shape in Acanthocephalus Ranae

R. A. HAMMOND 1

1 Department of Zoology, University of Bristol; Department of Zoology, University College, Cardiff

1. Two indirect methods for recording changes of hydrostatic pressure within the trunk of Acanthocephalus ranae have been described.

2. Internal pressure has been shown to be lowest when the trunk is fully contracted and the proboscis invaginated, and highest when the trunk is fully elongated.

3. A rapid rise of internal pressure occurs when the circular trunk muscles contract.

4. Overall internal pressure changes of up to 0.5 cm. Hg have been shown to occur in active specimens.

5. The body length when fully extended is only 40-50% greater than when contracted.

6. The correlation between muscular activity, body shape, and internal hydrostatic pressure in A. ranae is discussed

Submitted on January 25, 1966






© The Company of Biologists Ltd 1966