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Biol Bull 106: 15-20. (February 1954)
© 1954 Marine Biological Laboratory
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A NEW MARINE CERCARIA FROM THE WOODS HOLE REGION AND ITS BEARING ON THE INTERPRETATION OF LARVAL TYPES IN THE FELLODISTOMATIDAE (TREMATODA: DIGENEA)

R. M. CABLE 1

1 Department of Biological Sciences, Purdue University, Lafayette, Indiana, and The Marine Biological Laboratory, Woods Hole, Mass.

Cercaria laevicardii sp. nov. is described from the marine lamellibranch, Laevicardium mortoni. The cercaria develops in simple sporocysts and is similar to the larva of Bacciger bacciger. The excretory formula is 2 [(3 + 3) + (3 + 3)] and the structure and development of the excretory system is such that the larva is interpreted as having been derived from the furcocercous type. Various caudal modifications in fellodistomatid cercariae are discussed and the possible phylogenetic significance of some types is mentioned.






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