Ornate  Auger Shell, Terebra ornata

Ornate  Auger Shell, Terebra ornata. Shell collected off the beach at Punta Chivato, Baja California Sur, February 2025. Size:  6.7 cm (2.6 inches) x 1.6 cm (0.6 inches). Collection, photograph and Identification courtesy of Colin Campbell, DVM, Punta Chivato, Baja California Sur.

Ornate  Auger Shell, Terebra ornata. Shell collected off the beach at Punta Chivato, Baja California Sur, February 2025. Size:  8.4 cm (3.3 inches) x 2.4 cm (0.9 inches). Collection, photograph and Identification courtesy of Colin Campbell, DVM, Punta Chivato, Baja California Sur.

Phylogeny: The Ornate Auger Shell, Terebra ornata Gray, 1834,  is a gastropod mollusk that is a member of the Terebridae Family of Auger Shells. The Terebra genus is one of nineteen genera in the Terebridae Family, and there are one hundred eighteen species in the Terebra genus. They are known in Mexico as Taladro Ornado.

Description: Ornate Auger Shells are solid, with a short body whorl and a very high spire. Overall, they are narrow and elongate, but some individuals are more slender or broad than others. They consist of around fifteen fairly flat-sided whorls. Each whorl has a groove above its center line.  The whorls are sculpted with fine axial striae. They have a small, elongate, aperture. The columella is recurved and has two folds. The exterior of the shell is beige in color, with squarish brown spots. There are four rows of spots on the body whorl and two or three on the other whorls. They do not have a periostracum. Ornate Auger Shells reach a maximum of 11.0 cm (4.3 inches) in length.

Habitat and Distribution: Ornate Auger Shells are found on mud, rubble and sand substrates. They live in the intertidal zone, and to depths up to 85 m (279 feet). They are a subtropical to tropical Eastern Pacific species that are found in all Mexican waters of the Pacific Ocean, including the Tres Marias Islands, with the exception that they are absent from north of Bahía San Luis Gonzaga, Baja California, in the Gulf of California, and along the west coast of the Baja Peninsula.

Ecology and Behavior: Ornate Auger Shells are a poorly studied and understood species. There is very limited documentation of their diet, predation, reproduction or ecosystem interactions. Other species in the Terebridae Family are predators that feed primarily on polychaete worms. Their predators include crabs and other gastropods. They are gonochoric and reproduce sexually, with internal fertilization. The eggs are laid in protective capsules. Their engagement in any type of commensal, parasitic, or symbiotic relationship has not been formally documented. From a conservation perspective the Ornate Auger Shell has not been formally evaluated.

Synonyms: None