|image by Alexander Semenov|
|Note: this image probably does not accurately represent the feeding biology of dorid nudibranchs|
5. Echinoderms (such as brittle stars)
I begin with that most sinister of predatory nudibranch: the echinodermativore! To be sure, the number of sea slugs that are known to feed on echinoderms is a relatively short list-but probably one of the most gorgeous is this Indo-Pacific one: Kalinga ornata!
Here's a nice pic, for example, of a dorid nudibranchOnchidoris muircata feeding on a bryozoan colony. Bryozoans aka "lace animals" are a phylum of colonial invertebrates that form very delicate skeletons. They are fairly common in many areas as encrusting, colonial forms.. MANY nudibranch species seem to feed on them...
Not sure which species this is..but you can see they've pretty efficiently cleared off the living tissue from the bryozoan skeleton
This species, Crimora coneja was imaged in Oregon feeding on the bryozoan colony here. You can see the stark white regions around the nudibranch where it has fed, versus the lighter, fuzzier areas around the edges.
Nudibranch feeding on sponge from BIOPIXEL on Vimeo.
Its always interesting how many people are fascinating not just by predation but "cannibalism" which when applied to the animal world seems to mean when one "type" of animal feeds on the same or similar "type" of animal. (i.e. sea stars that feed on sea stars) and not just one species feeding on itself (as it does in humans).
Its not as common but there are several noteworthy nudibranch predators that feed on OTHER nudibranchs...
The formidible Navanax from the North Pacific for example.. They seem to be quite effiicient at swallowing their prey whole! If these were the size of say, a dog or a wolf we would be VERY afraid of them!
I've always loved the name of this nudibranch. It has a nice ring to it!
1. SLUG EAT FISH!
This really WAS the most amazing thing to discover. It turns out there's a dorid nudibranch called Gymnodoris nigricolor (name translates into the "black Gymnodoris) which attacks and EATS the FINS of certain FISH!
These slugs basically crawl onto a goby and begin to eat their way down a fin spine, gnawing off the meat on the fin. Some have called this behavior parasitc but I think of it as more predatory. I suppose its really kind of both.
My friends over at BlennyWatcher have a nice little account of this with links, etc. here. I've included a VIDEO of this behavior at the bottom!