You could be forgiven for thinking this was a snapshot of Cthulhu himself but in fact it is a free swimming Actinotroch larva of a phoronid worm. They’re marine animals that filter-feed on plankton, build upright tubes of chitin to support and protect their soft bodies and have a ‘crown’ of tentacles called a lophophore– which is what gives this one his distinctly Lovecraftian appearance.