Jam's Germs on Instagram: "This is a single-celled organism, a trachelocercid, and it’s spiralling the same way I do when I find a new topic to hyperfixate. 😂 . Trachelocercids can grow over half a centimeter in length, and I can see them easily with the naked eye. They live between sand grains in marine habitats and feed on smaller organisms, swimming by beating thousands of hair-like cilia along their cell surface. . Despite being single-celled, they can sense light, most likely through photo