Distribution of the Parasitic Isopod Hemioniscus balani with Special Reference to the East Coast of North America

Abstract

Hemioniscus balani Spence Bate, a parasitic isopod with a world-wide distribution in temperate waters, was not found among intertidal populations of Balanus balanoides examined between 1959 and 1965 on the east coast of North America from Newfoundland to Cape Hatteras, except for a small area near Halifax, Nova Scotia.The North American variety of Balanus balanoides, when transplanted from Woods Hole to North Wales, was found to be much more susceptible than the European variety to parasitisation by H. balani.