Mollusc eye

The molluscs have the widest variety of eye morphologies of any phylum,[1] and a large degree of variation in their function.

Compound eyes are present in some bivalves, and reflective 'mirrors' have been innovated by other lineages such as scallops.

[1] As well as varying in complexity, the eyes of molluscs span a huge range in size; they may be from 20 μm (0.0008 in) to 27 cm (11 in) across.

Consequently, many molluscs may have a multitude of eyes in more unlikely places, such as along the edge of their shell.

[1] Media related to Mollusca eyes at Wikimedia Commons