Trichomycetes refers to a group of fungi in the division Zygomycota that grow in the guts of arthropods living in aquatic habitats.[1][2] The name is obsolete, having not been validly published.[3] Species formerly placed in the Trichomycetes are now placed in the orders Harpellales and Asellariales, both in the subdivision Kickxellomycotina,[4] while Amoebidiales and Eccrinales are included in Opisthokonta.