About Trophon geversianus (Pallas, 1774)
The adult shell of Trophon geversianus ranges in size from 30 mm to 111 mm. The species shows very high morphological variability. The aperture accounts for more than half of the total shell length, and it always has a visible color, ranging from brown to violaceous. The exterior of the shell has strong lamellae. It may also feature spiral cords, which can occur alone, form a reticulate structure when combined with the lamellae, or the exterior can be smooth. The exterior shell color ranges from brown to whitish, with a dull finish. This species feeds on members of the Mytilidae family that live on intertidal rocks. It is distributed in the Atlantic Ocean, occurring off the coasts of Argentina, the Falkland Islands, Tierra del Fuego, and Chile.
