Headshield Slugs; Cephalaspidea

These opisthobranchs spend more time under the sand than above, so are not often spotted when scuba diving. Note the common “headshield” front, used for cruising below the substrate.

Identifiable by the distinctive horizontal body stripes.

The headshield slug most often spotted when diving here. We have often seen them in large groups and even seen one swimming !

We first thought that this was Philinopsis lineolata until checking the photos after the dive...

The juveniles seem to have a darker colouration and a more simple patterning than the adults.

We thought it looked a bit like Philinopsis specios at first, but now we know that it is not.

Quite different from the Aglajids shown above, this Gastropterid moves surprisingly quickly (for its tiny size) over the sand.

This is a fairly obscure headshield slug, known as a bubble shell, due to its relatively large internal shell.

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