Fungus Gnat Larvae, La Isla Escondida, Colombia

Here comes a puzzling observation. On our path we found a giant fallen tree that was overarching the path diagonally, and looked like it had been in that position for years. On the backside of this fallen tree, we saw clusters of silk wires hanging down. Like singular silk lines in a vertical orientation joining up into a horizontal lines above it.

At the end of each cluster, we found some weird predatory worm-like creatures. After some research, these are likely the larvae of a specific species of Fungus Gnats (which are small flies). This particular hunting behavior is documented for this Australian/NZ genus:

https://en.wikipedia.org/wiki/Arachnocampa

This cool illustration does a creative job of documenting their way of life:
http://photos1.blogger.com/blogger/4869/2549/1600/bugfinalweb.0.jpg

They glow to attract prey, hang out lures, then pull up the wire to feed on the prey, which may include themselves (cannibalism). They are typically found in caves or deeply into the rain forest as their web structures cannot tolerate any wind.

What we found seemed extremely similar to the description of Arachnocampa, but we're obviously way out of range. Another known case closer to Colombia is the North American species Orfelia fultoni. I haven't found much else yet on South American species.

Here's a video of the initial discovery:

I don't know what's up with the sound. My smartphone led a creepy life of its own in this jungle, including recording videos I didn't even initiate.

The larvae are tiny and light, partly translucent. In the series you can see a pure white individual as well as an individual with dark bulbs. I don't know what the bulbs are, theory for now is digestion.

And finally, you absolutely MUST watch this video of the New Zealand species: