Unidentified Larva - Diptera?

I found this little squirmy fella under a log in a mixed forest. It was anchored to a stick with silk. It was mostly translucent with a reddish "stripe", which may have just been the digestive tract. It also *may* have had some headgear, but I didn't get a good look because as soon as I touched it, it curled up in the position seen in this photo. It clearly didn't like me, so I snapped a couple shots and put it back under the log.

I suspect that it could be a nematode. Or, perhaps a fungus gnat larva (Mycetophilidae) because of the silk attaching it to the stick. Maybe a planarian as well.

Habitat: Mixed forest