1) Arthropod family 2) Family mycetophylidae 3) Fungus gnats 
Mycetophilidae is a family of small flies, forming the bulk of those species known as fungus gnats. There are approximately 3000 described species in 150 genera but the true number of species is undoubtedly much higher. They are generally found in the damp habitats favoured by their host fungi and sometimes form dense swarms. Adults of this family...
[n] - fungus gnats
family Mycetophylidae noun fungus gnats