It was found in Houston, Texas, but I've never seen one before. Does anyone know what it is?
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Sub-adult tropical orb weaver spider. "Its range is largely circum-Caribbean, occurring in Florida, Louisiana, and Texas along the Gulf Coast of the United States."
Harmless to humans and considered beneficial.
Bites of this species are not known to cause serious effects to humans. ... The web probably catches many moths and other night flying insects; these spiders may be particularly beneficial along woodland borders of field agroecosystems and within orchards.