A rare spider discovered at a construction site in San Antonio has shut down a $15 million project as federal and state officials consider ways to continue without disrupting the arachnid’s natural habitat.

The spider, identified as a Braken Bat Cave Meshweaver, is an endangered, non-venomous species that lives in caves, has no eyes and is virtually translucent. Josh Donat, a spokesman for the Texas Department of Transportation, said the recent discovery is only the second time the species has been spotted in more than 30 years.