Shell globose, solid, with stout conical spire. Sculpture of broad, flat spiral cords with narrow interspaces. Aperture ovate, with outer lip somewhat thickened inside, hardly denticulated. A shallow, small siphonal notch at the anterior end of the aperture.
dark brown, nearly black, showing through as bands inside the aperture.
common size :
The related species Planaxis sulcatus (Born, 1780) is larger (up to 35 mm) with more separated and higher cords, and a more variable color pattern of flames. This species differs from P. punctostriatus in having heavier cords, a stouter profile, and in lacking the distinct tooth bordering the siphonal notch.
BIOLOGY / ECOLOGY
This species differs from the related P. sulcatus in lacking planktotrophic larvae.
on rocks of the shore.