Somatiidae

Definition

A small family of acalyptrate brachyceran flies (Diptera) containing the single genus Somatia. These Neotropical flies are characterized by a stout rounded thorax with a distinct transverse suture, an elongated post-coxal bridge separating the legs from the body, a broad downcurved petiolate abdomen, and elbowed antennae with bipectinate arista. The enlarged pronotum and postcoxal bridge produce a superficial resemblance to Syringogastridae, from which they differ in abdominal structure.

Etymology

From the type genus Somatia (Greek sōma, body), referring to the compact, robust body form

Example

Somatiidae species such as Somatia sexpunctata display the family's diagnostic combination of black-and-yellow coloration, enlarged pronotum, and petiolate abdomen—features that distinguish them from the superficially similar Syringogastridae despite shared postcoxal bridging.

Related Terms

• Acalyptratae
• Brachycera
• Diptera
• Somatia
• Syringogastridae
• post-coxal bridge
• petiolate abdomen
• bipectinate arista

Usage Notes

Family rank is confirmed by GBIF and EOL sources; monotypic at the genus level with approximately seven described species, all restricted to the Neotropics. The resemblance to Syringogastridae represents convergent or symplesiomorphic morphology in postcoxal bridging, not close phylogenetic relationship. The petiolate (stalked) abdomen is the key character separating Somatiidae from Syringogastridae, which have a sessile abdomen.