What do you get when you cross a Cockroach with a Spider?

In a recent dream, evolution took a strange twist. The giants insects that invaded my house were half spider and half cockroach. Imagine a cockroach that could spin a web. Unfortunately, this evolutionary change was not such a good one for the poor roach, because half the bug wanted to hide when it sensed danger, while the spider half really didn't care. So, whenever I entered a room, the cockroach side tucked itself away, leaving the spider half exposed. So, I was able to easily step on the enormous bugs, leaving a gelatinous bloody pool on the floor.

Dream interpretations are welcome.

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