Abstract
AbstractLimonia (Idioglochina) marmorata (Osten Sacken) is the only intertidal tipulid along the entire west coast of North America. The pupae have prominent prothoracic respiratory horns which are modified to form plastron-bearing spiracular gills. Examination of these gills by both light and scanning electron microscopic methods reveals that they resemble the spiracular gills of the intertidal Limonia (Geranomyia) in general form, but in fine detail they more closely resemble those of the intertidal species of Limonia (Dicranomyia). Using the fine structure of the spiracular gills as a classificatory feature along with larval and adult characters, it is suggested that there is little distinction between Idioglochina and Dicranomyia at the generic level. This confirms the contention of Hinton and also lends weight to the classificatory scheme of Alexander, who distinguishes Idioglochina and Dicranomyia only at the subgeneric level.
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