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Biol Bull 153: 113-120. (August 1977)
© 1977 Marine Biological Laboratory
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DWARFISM IN A SABELLID POLYCHAETE, A STUDY OF AN INTERSTITIAL SPECIES

N. J. BERRILL

The anatomy and behavior of a species of the sabellid polychaete subfamily Fabricinae, is described. Mature individuals are virtually microscopic and represent the extreme degree of dwarfism apparently possible for a sabellid. Eggs are matured and liberated unilaterally, one at a time, from a single thoracic segment. Dwarfism in this species is essentially a cessation of body growth at a juvenile stage, accompanied by precocious sexual maturity, as an adaptation to persistent occupation of an interstitial detrital habitat.






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Copyright © 1977 by the Marine Biological Laboratory.