Haliotis madaka (Habe, 1977)
Distribution: In Japan, Honshu and Kyushu. Size up to 224mm.

20-30m deep, Chiba prefecture, Honshu, 143mm. The species is large, rounded, thin shelled,
with a heavy sculpture made of large ribs, folds on growth marks, and sparse bumps.
The brown surface seems covered with a kind of periostracum.
Wavy crown. The holes are strongly elevated, like the local stratovolcanoes.
At right, Fuji-San, or Klyuchevskaya Skopa.
The surface between the row of holes and the concave columella is large, wide, with a carina.
Spire not often visible in ventral view.

20m deep, Shimojima, Tsushima, Nagasaki prefecture, Kyushu. 144mm.

All pics © Olivier Caro