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Unidentified immature stages

Caterpillar? No, Syrphid Larva. Larva Syrphid larva? strange larva 4 mm light green translucent caterpillar apx 6mm long green larvae Elm Grub Immature Syrphid?
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Diptera (Flies)
No Taxon ("Aschiza")
Family Syrphidae (Hover Flies)
No Taxon Unidentified immature stages
This section is a collection of unidentified syrphid larvae and pupae, but here are some of known genus:

Subfamily Eristalinae

Subfamily Microdontinae

Subfamily Syrphinae

Eupeodes (larva and puparium)

Eupeodes americanus (larva and puparium)

Lapposyrphus lapponicus

Ocyptamus fuscipennis (larva and puparium)

Pseudodoros clavatus (larva and puparium)

Scaeva pyrastri (larva and puparium)

Syrphus (larva and puparium)

Toxomerus geminatus (larva and puparium)

many larvae illustrated in(1)
See larvae and puparia of Syrphinae | Syrphini
Some larvae have been grouped by general looks here to help with IDs
Larvae of the three subfamilies of Syrphidae have distinct habitats. Syrphinae are predators found on plants. Microdontinae are in ant nests. Eristalinae are saprophagous in a variety of wet or rotting habitats (including rotting plants) and are occasionally found in nests of Hymenoptera other than ants.
Contributors are encouraged to photograph larval syrphids, then pickle in alcohol and send to Jeff Skevington. He says, "We have built a large DNA library to help with larval ID; we can identify them and build a much better larval photo library. Rearing is an option but it is slow and often without reward."
Internet References
Dipterist Forum. Colour Guide to Hoverfly Larvae (Diptera, Syrphidae) in Britain and Europe. Graham E Rotheray
Works Cited
1.The Syrphidae of Ohio
Metcalf C.L. 1913. Ohio State U. 122 pp.