Tanypezidae

Definition

A small family of acalyptrate Diptera, commonly called the stretched-foot flies, comprising approximately 28 species in two genera: Tanypeza (primarily Nearctic with one species extending into the Palaearctic) and Neotanypeza (Neotropical, including one fossil species from Dominican amber). The family is characterized by elongated legs and is sister to the Strongylophthalmyiidae, with which it shares a complementary geographic distribution.

Etymology

From Greek tanys (stretched, long) + peza (foot, leg), referring to the family's distinctive elongated legs.

Example

Tanypeza longimana, the type species of Tanypezidae, ranges across eastern North America and extends into the Palaearctic region, while the extinct Neotanypeza dominicana is known only from 17–20 million year old Dominican amber.

Synonyms

• stretched-foot flies

Related Terms

• Acalyptratae
• Strongylophthalmyiidae
• Diptera
• Neotropical region
• Dominican amber

Usage Notes

The family is distinguished from its sister group Strongylophthalmyiidae primarily by distribution (New World versus East Asian) and subtle morphological differences in leg proportions and wing venation. The common name 'stretched-foot flies' directly translates the etymology and refers to the conspicuously elongated legs characteristic of adults. When referring to the family in formal taxonomic contexts, Tanypezidae is treated as a plural noun (e.g., 'Tanypezidae are rare in collections').