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Unidentified Sciarid Larvae and Pupae

strange larvae! Unknown worm/larvae Large groups of what I'm guessing are Larvea. Larvae flowing en masse.  Are these of the family Sciaridae – Dark-winged Fungus Gnats? larvae migration 3 swarms,   2. Fish shape  and a circle Sciaridae in standing dead herbaceous stem Sciaridae in standing dead herbaceous stem
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Diptera (Flies)
No Taxon ("Nematocera" (Non-Brachycera))
Infraorder Bibionomorpha (Gnats, Gall Midges, and March Flies)
Superfamily Sciaroidea (Fungus Gnats and Gall Midges)
Family Sciaridae (Dark-winged Fungus Gnats)
No Taxon Unidentified Sciarid Larvae and Pupae
Asked about the larvae that travel in large masses, sciarid specialist Rob Deady responded (9/23/2014):
"From what I gather there are several species that do this but the one I'm most familiar with is Sciara militaris (great species name) and S. thomae. See: As well as these species, apparently Cratyna perplexa, Ctenosciara hyalipennis, Bradysia bicolor and many other Sciara also may exhibit this behaviour. I wonder does Sciara humeralis exhibit this behaviour also. I found huge amounts of it in a boggy lakeside reed bed over the summer and apparently it always is found in extremely wet environments. It has to be a response to excess water logging I reckon, water is definitely the trigger but who knows.
"They generally crawl over a mucous that each larvae produces and they march in search of a drier area in which to pupate from little excerpts of work I have read and generally not to feed but this needs to be studied further. It has been suggested by some authorities that they migrate to avoid excess pressure from competition, another possibility perhaps."
See Also
Unidentified Immature Stages - Order Diptera - Flies
Fungus Gnats and Gall Midges:
Immature Stages and Wingless Adults - Superfamily Sciaroidea - Fungus Gnats and Gall Midges (Family unknown)