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Biol Bull 58: 274-280. (June 1930)
© 1930 Marine Biological Laboratory
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DISTRIBUTION OF SETÆ IN THE EARTHWORM, PHERETIMA BENGUETENSIS BEDDARD

P. B. SIVICKIS 1

1 From the Zoölogical Laboratories, University of the Philippines, Manila and Lietuvos Universitetas, Kaunas, Lithuania

The numbers of setæ on particular segments of Pheretima benguetensis vary in definite directions in different regions of the body. The number is lowest on the most anterior segments, increases posteriorly to a maximum at a level just posterior to the reproductive organs, and then decreases gradually to the posterior end. A relation between this course of variation and the physiological gradients is suggested. The standard deviations for corresponding segments indicate that the number of setæ on a particular segment should be used for determination of species only in connection with other characters.






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Copyright © 1930 by the Marine Biological Laboratory.