40d:Phantom spider

Phantom spiders are vermin that occur in evil forest biomes. They are closely related to cave spiders; they produce webs that can be collected and woven into thread at a loom, and bite creatures to inject a venom. Note that stipping an area of available trees reduces the amount of webbing present; presumably they need the trees to hang the webbing, unlike cave spiders. They can be a danger to dwarves because their venom paralyzes, and since they are vermin they are very difficult to see. However, their venom wears off after some time^[Verify], and they are not unduly aggressive. Their extracts are phantom spider venom and antivenom, both worth 20 monies. The antivenom cannot actually be used to treat poisoned dwarves.^{v0.27.169.33c [Verify]}