H. rugosa. Mantle lobes sealed except for small opening for foot; sucker-like. Top left: tip of foot showing, and rounded anterior gape of shell resembles Zirfaea crispata. Bottom left; emitting milt as temperature rose during photography. Menai Strait.
H. rugosa. Mantle lobes sealed except for small opening for foot; sucker-like. Top left: tip of foot showing, and rounded anterior gape of shell resembles Zirfaea crispata. Bottom left; emitting milt as temperature rose during photography. Menai Strait.
H. rugosa. Mantle lobes sealed except for small opening for foot; sucker-like. Top left: tip of foot showing, and rounded anterior gape of shell resembles Zirfaea crispata. Bottom left; emitting milt as temperature rose during photography. Menai Strait.