"jthread" wrote in message ...
And here is a picture of a sea cucumber:
http://scilib.ucsd.edu/sio/nsf/fguid...dermata27.html

it knid of looks like a worm. and it does burrow back in the sand.

Are its tentacles/antennas branched liek in cucumber
or long and single like in case of the spaghetti worm ?

are sea cucumbers harmfull?

No, they are also beneficial.