Hello. I've been unable to find anything definite on this question, and will be the first to admit that it is somewhat silly, but anything I seem to be able to find on the topic seems to be allowing it. These seem to be the relevant passages:
School transmutation; Level alchemist 2, bloodrager 2, druid 2, magus 2, sorcerer/wizard 2, summoner 2
CASTING
Casting Time 1 standard action
Components V, S, M (a live spider)
EFFECT
Range touch
Target creature touched
Duration 10 min./level
Saving Throw Will negates (harmless); Spell Resistance yes (harmless)
A material component consists of one or more physical substances or objects that are annihilated by the spell energies in the casting process. Unless a cost is given for a material component, the cost is negligible. Don't bother to keep track of material components with negligible cost. Assume you have all you need as long as you have your spell component pouch.
A spider the size of a man crawls silently from the depths of its funnel-shaped web.
Can someone please point out to me what I'm missing?
I would totally allow that, even though it's a bit silly, and I think it is technically RAW. Technically.
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You can't sacrifice something you don't have possession of. Otherwise you can use it to kill the enemy or allied spellcasters spider familiar/animal companion.
You could also cast spells using another mages spell components while still in their possession.
I know as vermin, spiders are mindless, but if you could summon them or dominate them I would allow it.
I could see one argue that you need to possess the material component.
"A spell's components explain what you must do or possess to cast the spell."
These Giant Spiders, do you possess them? Do you own or have them?