Atlantic triton

The shell size varies up to 375 millimetres (14.8 in) The maximum recorded shell length is 374 millimetres (14.7 in) This conical shell has an elongated and sharply pointed spire without any knobs, but somewhat squatter than the spire of the Pacific Charonia tritonis. The lower whorls are unevenly swollen with a varix and bulge over the suture. The suture then descends in an uneven spiral. The parietal callus is lined with a narrow, dark inner lip, covered with regularly spaced, brown, rib-like plicae. The outer lip is scalloped but less projected and toothed with about 10 pairs of rib-like teeth superimposed on square, dark brown blotches. The color of the shell is mottled in shades of creamy white to yellow with brown markings. The inside of the large aperture is orange pink, and the interior is white. The species is highly variable and does not have any known geographic subspecies. The veliger larvae have a period of pelagic development of more than three months, drifting in the trans-Atlantic currents. These larvae are the largest known of any Ranellidae in the Atlantic; the larval shell reaches 5 millimetres (0.20 in) when fully developed.