Context: Steatoda nobilis has a brown bulbous abdomen with cream coloured markings that are often likened to the shape of a skull. The legs are reddish-orange. Females range in size from about 9.5 to 14 mm in size, while males are 7 to 11 mm. Males are able to produce stridulation sounds during courtship, by scraping 10-12 teeth on the abdomen against a file on the rear of the carapace.\n\nQuestion: a spider with a skull on its back?
Steam of consciousness below:

User
The relevant information to answer the above question is: Steatoda nobilis has a brown bulbous abdomen with cream coloured markings that are often likened to the shape of a skull.
So, the answer is Steatoda nobilis.
Assistant