A fully executed contract date begins once both parties signed it. In your case, since you signed them first, the date begins when the seller/affixes his signature. However, the delivery of the ratified contract should also be considered. Consult your realtor and a lawyer.
A group of spiders is called a cluster or clutter. Spiders belong to the group of animals called arachnids.
You may have heard about Spiders called the Sun Spider or the Wind Scorpion. However, their popular name is the Camel Spider. Yet the debate continues by experts about them.