The variation in convexity of the valves and the development of the pedicle opening in M. echinata is described in shells from a length of 1·2 mm to 13·5 mm and it is concluded that the differences in shell shape and form of the pedicle opening between M. truncata and echinata are of no more than specific value and that the latter species should be transferred from Pantellaria back to Megerlia.
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D. Atkins (1961) studied this question.
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