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'The most common of [green rhabdocoels] is generally attributed to Shaw (1791) who described it under the name Hirudo viridis and gave some colored figures. Some workers, however, were of the opinion that Shaw's species was identical with Fasciola helluo 0.F. Muller, 1774, and hence they applied the name Dalyellia helluo to the species. It was pointed out by Sekera (1912), however, that Muller refers to spherical capsules, whereas the common species has distinctly oval capsules, as is also shown in Shaw's figures. It thus appears that Muller's species cannot be identified with certainty and that one may safely apply the name Dalyellia viridis to the commonest of the European green species of Dalyellia, distinguished by its oval capsules.' (Hyman, 1955, p. 10) |
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