Abstract
Summary Species of fungi assigned to the Harpellales, Trichomycetes, occur obligately associated with Insecta. Their possession of monosporous merosporangia (trichospores), zygospores, and crosswalls flared around a plugged central pore augurs for close phyletic affinity with the Kickxellales (Zygomycota). Somatic and reproductive thalli occur attached to the cuticle lining the mid- and hindguts of aquatic dipteran larvae and hindguts of ephemeropteran and plecopteran nymphs. This stage is considered commensalistic. In some species a pathogenic stage of the Harpellales is associated with the ovaries and reduces fecundity. At oviposition fungal spores are deposited by the imago at the sites of new larval populations and provide the primary inoculum.
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