Sanguine Trivia Shell, Trivia sanguinea

Sanguine Trivia Shell, Pseudopusula sanguinea. Shell collected off the beach of Bahía Concepción, Baja California Sur, October 2019. Size: 1.0 cm (0.4 inches) x 0.7 cm (0.3 inches). Colllection and photograph courtesy of Bob Hillis, Ivins, Utah.

The Sanguine Trivia, Pseudopusula sanguinea (Gray, 1832), is a gastropod mollusk that is a member of the Triviidae Family of Trivia. They are also known as the Bloody Trivia and in Mexico as trivia mancha roja. The shells are small in stature that do not have a gap along the dorsal surface and have a narrow and curved aperture. They are brown, mahogany or purplish brown in color with a reddish stain on their dorsal surface and pale ribs. The Sanguine Trivia Shells reach a maximum of 1.5 cm (0.7 inches) in length and 1.0 cm (0.4 inches) in height.

Sanguine Trivia are found under rocks in the intertidal zone to depths up to 60 m (200 feet). They range from Magdalena Bay, Baja California Sur to Peru, including the Galapagos Islands and they are found in the southern half of the Sea of Cortez.