Can someone help ID this hitch hiker? It seems to be something longish .... what is shown is perhaps the head .... or whatever. It moves very much like how a sea cucumber or slug moves. Any info is appreciated.
That is a Chiton. It's a relative of snails. They usually feed on films of algae on rocks. I have (or at least had) one of this species or a very similar sp. in my tank and I used to know the name of the genus. I might have it on my home computer somewhere.
Chitons come in several different shapes from round to oval to elongate. The mantle on this one mostly covers the 8 plates. It's in the genus Cryptoplax, possibly species larvaeformis. The plates are reduced in size so the animal is far more flexible and sluglike than other chitons.
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