Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Upcoming Events

Interested in a 2022 BugGuide gathering in New Mexico?

Photos of insects and people from the Spring 2021 gathering in Louisiana, April 28-May 2

National Moth Week 2020 photos of insects and people.

Photos of insects and people from the 2019 gathering in Louisiana, July 25-27

Discussion, insects and people from the 2018 gathering in Virginia, July 27-29

Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

Photos of insects and people from the 2014 gathering in Virginia, June 4-7.

Previous events


Family Sciomyzidae - Marsh Flies, Snail-killing Flies

Swamp fly - Limnia - female I haven't got a clue what this guy is... - Sepedon Sciomyzidae, dorsal - Limnia I think it is a Marsh fly, but... - Sepedon Fly - Limnia loewi - female Diptera? - Sepedon Sciomyzoidea? - Sepedon Dictya
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Diptera (Flies)
No Taxon ("Acalyptratae")
Superfamily Sciomyzoidea
Family Sciomyzidae (Marsh Flies, Snail-killing Flies)
Synonyms and other taxonomic changes
northeastern fauna reviewed in (1)
Explanation of Names
Sciomyzidae Fallén 1820
almost 200 spp. in >20 genera in our area(2), all in the nominate subfamily; ~620 spp. in 66 genera total(3)
5-10 mm
body yellowish, brownish, or grayish; antennae extend forward noticeably, a distinctive feature; wings often spotted or otherwise marked
northeastern spp., in (1); CA spp., in (4); Indiana spp., in (5)
throughout NA and the world
adults around marshes, lakes, ponds, or wooded areas; larvae are aquatic
larvae parasitize or prey on freshwater or terrestrial snails(6)
See Also
Dryomyzidae are similar but have a well-developed clypeus
Works Cited
1.Sciomyzidae of northeastern North America
Schorno S., Marshall S.A., Murphy W.L., Muzzatti M. 2019. Canadian Journal of Arthropod Identification 35: 1-331.
2.Nearctic Diptera (Discover Life's IDnature guide)
3.Order Diptera Linnaeus, 1758. In: Zhang Z.-Q. (ed.) Animal biodiversity: An outline of higher-level classification...
Pape T., Blagoderov V., Mostovski M.B. 2011. Zootaxa 3148: 222–229.
4.The marsh flies of California: (Diptera, Sciomyzidae)
Fisher T.W., Orth R.E. 1983. Bull. Cal. Insect Survey 24, vii+117 pp.
5.Comprehensive taxonomic, faunistic, biological, and biogeographic inventory and analysis of the snail-killing flies...of Indiana
Murphy, William L. 2021. Proceedings of the Indiana Academy of Science, Vol. 129 (2), p143-265. 123p. .
6.American Insects: A Handbook of the Insects of America North of Mexico
Ross H. Arnett. 2000. CRC Press.