Note on the Life History of Hemiurus communis Odhner

Abstract

In May 1921 and again in February 1923 a specimen of the copepod Acartia clausi Giesbrecht, from which was emerging a parasitic trematode, occurred in the townets. The first, taken between Rame Head and the Mewstone, outside Plymouth Sound, was a full grown female Acartia, nearly dead, which had the skin broken between the first and second segments of the metasome where the trematode was emerging. The second, taken close to the shore from near the mouth of the Cattewater, was a full grown male which was alive but the skin was broken between the cephalosome and metasome where the trematode was emerging in a similar way to the first.