Fissurellidea d'Orbigny 1839

This closeup of the aperture in a living individual shows the anus and papillae which could look like retracted gills inside the opening. The anterior end of the animal is to the left. In this view the mantle has been almost completely retracted from covering the shell.

Here is the same shell, dissected out of the animal. Anterior is to the left. There is not an obvious groove around the margin of this shell but there are a series of small concentric grooves, including on the margin. The anterior and posterior ends of this shell do not turn up but slope down less steeply than elsewhere on the shell.

This view of the mouth (left) and foot of the animal show that the mouth and head looks more like that of a typical limpet than of a nudibranch.

Fissurellidea bimaculata found at Cape Flattery, WA. The shell is almost completely exposed. in this view (Photo by: Dave Cowles July 2007)