![Tanaid parasite living inside holothurian skin of a sea cucumber](http://static.sciencelearn.org.nz/images/images/000/001/501/full/Tanaid-parasite20160726-1248-ajhcmn.jpg?1674166348)
In the first picture is possible to spot (arrows), thanks to the transparency of the holothurian skin (sea cucumber), two specimens of the tanaid – small, bottom-dwelling marine crustaceans, living inside the holothurian. Here they use their claws to feed on the host skin. In some cases the parasites excavated ‘tunnels’, (picture on the right).