Diastatidae

Definition

A small family of true flies (order Diptera) comprising over 20 described species in three extant genera plus one fossil genus. Members are primarily distributed in the Holarctic Region, with some species extending into the Oriental, Neotropical, and Australasian regions. Diastatid flies are generally small and associated with decaying organic matter; their larvae develop in fermenting or decomposing substrates.

Etymology

From Greek diastatos 'standing apart' or 'separated', referring to the family's distinct morphological placement among acalyptrate flies.

Example

Diastata costata, a Holarctic species, is among the more frequently encountered diastatids in temperate North America and Europe.

Related Terms

• Diptera
• Acalyptratae
• Ephydroidea
• Ephydridae
• Curtonotidae

Usage Notes

Diastatidae is one of several small families historically grouped near Ephydridae (shore flies) within the superfamily Ephydroidea. The family's limited species diversity and scattered distribution make it a minor but phylogenetically informative lineage for studies of acalyptrate fly evolution. Identification to genus or species typically requires examination of male genitalia and chaetotaxy.