This parasitic amphipod that washed up on shore looks like it's made out of glass. This completely transparent creature is as small as the tip of your finger. As beautiful as it looks, this parasite ...

As the names suggest, the subdivision of annelids into the Errantia and Sedentaria matches their overall lifestyles (Fig. 1). Members of the Errantia are free to move about, and crawl, swim or burrow.