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Related Experiment Video

Updated: Jul 6, 2026

An Optimized Protocol for Rearing Fopius arisanus, a Parasitoid of Tephritid Fruit Flies
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A second contender for "world's smallest fly" (Diptera: Phoridae).

Brian V Brown1

  • 1Natural History Museum of Los Angeles County, Los Angeles, United States of America.

Biodiversity Data Journal
|February 9, 2018
PubMed
Summary

A new species of minute, limuloid phorid fly, Megapropodiphora arnoldi, has been discovered in Brazil. This tiny insect, measuring only 0.395 mm, is slightly smaller than the previously recognized smallest fly species.

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Area of Science:

  • Entomology
  • Insect Taxonomy
  • Biodiversity

Background:

  • The family Phoridae (Insecta: Diptera) represents a highly diverse group of flies.
  • Structural diversity within Phoridae includes the world's smallest fly, Euryplatea nanaknihali.

Purpose of the Study:

  • To describe a second minute, limuloid female phorid parasitoid fly.
  • To introduce Megapropodiphora arnoldi gen. n., sp. n. as a new species and genus.

Main Methods:

  • Morphological description based on a single female specimen.
  • Comparative analysis with known phorid species, including Euryplatea nanaknihali.

Main Results:

  • Megapropodiphora arnoldi is described from Brazil, measuring 0.395 mm in body length.
Keywords:
biodiversityparasitoidtaxonomytropical

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  • This new species is slightly smaller than Euryplatea nanaknihali.
  • Distinctive features include an enlarged head, mesothorax, scutellum, and extremely enlarged forelegs with reduced mid- and hind legs.

    • Conclusions:

    • Megapropodiphora arnoldi represents a new genus and species of minute phorid fly.
    • Its unique morphology distinguishes it from other described phorids.
    • The discovery highlights the continued exploration of insect diversity in regions like the Amazon.