Velvet Worm - Slime Guns

Velvet Worm - Slime Guns
Velvet worms (Onychophora) are old. They were one of the first groups of animals to come on land, and have been crawling in that super creepy way over the ground for the past 500 MILLION YEARS. Must be a pretty effective model. They're not insects, really, when they are placed in evolutionary trees, they are often wedged between the arthopods (insects), and the annelids (worms). And well, that's basically what they look like, right?

But what's really interesting about these dudes is that they are carnivores. And they have a REALLY weird way of capturing prey.
Anyway, the velvet worm captures its prey by using two squirt guns on either side of its head to squirt sticky stuff onto the prey object. The object is immobilized and the velvet worm digs in. But what is the stuff that comes out from the slime glands? It's not silk like comes out of spiders (and I should hope not, cause those slime shots would make Spiderman a LOT less romantic). The protein content of the slime is known, but how the slime formed up? Was it in strands like silk? Or was it...something else?

Whatever it is, it'd better be good at its job. Slime methods of capture need to be effective, because producing slime is expensive. It takes a lot of energy and a lot of resources.

Know more:
http://bogleech.com/bio-velvety.html
Watch the video:
World's Deadliest - Bizarre Slime Cannon Attack
Gif via Scince Llama