Studies on the Dung-breeding Flies in Japan : III. The Larvae of the Genus Myospila RONDANI, with Remarks on Some Significant Features in Relation to Feeding Habits (Diptera, Muscidae)

概要

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The larvae of five species belonging to the genus Myospila RONDANI, namely M. meditabunda (FABRICIUS), M. japonica SHINONAGA et IWASA, M. laevis (STEIN), M. bina bina (WIEDEMANN) and M. lauta (STEIN), were described and some significant features in relation to their feeding habits were discussed. The larvae of M. japonica hatched from eggs in second instar, and the third instar larva was obligately carnivorous like those of M. meditabunda and M. bina bina. On the other hand, the larvae of M. laevis and M. lauta were proven to hatch from eggs in third instar whose food habits were carnivorous and coprophagous, respectively. The discovery of monomorphic coprophagous larva indicates that the monomorphism is not necessarily correlated with the carnivorous mode of life. Dental sclerites were joined by a median ventral arch in both larvae of carnivorous and coprophagous. Posterior spiracles were characteristic in some species, but didn't give an indication of relationship among the species. Four obligatory carnivorous larvae have the ventral pharyngeal ridges which are incomplete and disappear in posterior part of pharyngeal floor. These pharyngeal ridges were completely developed in a coprophagous larva of M. lauta. It is suggested that the shape and structure of pharyngeal sclerites including ventral pharyngeal ridges are closely correlated with feeding habits.
日本昆虫学会の論文
1984-09-25