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external parasites of fislies -wliicli are claf=sed iu a family called the TristomidEe. 

 Most of these forms possess a small sucker on either side of the anterior end of the 

 body as well as one large posterior sucker, hence the name of the family. The 

 glandular areas described on the anterior end of Phyllunella represent the anterior 

 suckers. The Tristomidte belong to the order Trematoda. 



