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The spider that is black with a white crescent on its back is the Brown House Spider. This spider is often confused with the red-back spider.
If its black, has a large butt and there's a red shape on its back the resembles an hourglass, then its a black widow spider and they are very poisonous
The spider you are referring to is likely the marbled orb-weaver spider (Araneus marmoreus). This spider is known for its bright orange coloration with black spots or diamonds on its back. It is a common sight in many regions, including Texas.
Could be the arrowhead spider.
The American Black Widow should have nothing upon its back but the black color it is. Specfically, the hour glass is on the belly of the spider.
black widow
Your spider is a Heartstring spider the prettiest spider ever.
a garden spider
My guess is that this spider you saw was either a Jumping Spider (quite possibly a Daring Jumping Spider) or a Parson Spider.
A black widow spider is black with a red mark on it's abdomen; this might or might not be what you meant. The black widow sometimes has a red mark on her back, as well. The red backed spider of Australia, a relative of the black widow, has an orange red mark on the back.
i think it would b a tarantula
a wolf spider. they hurt but are not deadly to humans