editted post. this isnt a nudibranch. its a flatworm. Thanks to R for pointing out.
but im still writing abt nudibranches. 🙂 often are mistaken for sea slugs. seems that there are many many (many) forms of sea slugs, and ppl do get confused. ive seen a sea slug before. some gooey substance oozing on the rock on low tides. pity i didnt have a camera in 2005.
seems that some nudibranches have toxic stuff on their sides. defense mechanism. definitely needed, because they appear in really bright colours. check out the pics on google images. they are beautiful. some are well camouflaged. some, like this one, is clearly a stand out. hence the need for toxic stuff to ward of predators.
This is a fan worm. my first sighting of such a creature. never knew it existed.
it wont be right to say that its an animal. its annelid. its not exactly mobile. cos they are attached to rocks or stones or some sort of base. they feed on whatever the tide brings along their way. and they retract when they sense danger. feels somewhat similar to hermit crabs. like they run into a shell.
the video is on my VodPod. i dont have a water resistant camera, so i could only take the pic from the surface. you’ll have to wait till abt 12 sec into the video to realise whats happening.
on doing my research, found out that there’s feather duster worm, spiral fan worm, peacock fan worm. go check it out..
i love inter tidal marine organisms.