The body wall is thick and leathery and contains ossicles, including some table-shaped ones.

The mesentery of the posterior loop of their gut is attached to the right ventral interradius.

The muscles that run longitudinally down the body are arranged into five double bands.

They can emit sticky white threads known as cuvierian tubules from their cloacas in order to distract or entangle predators.

[4] Their popularity as luxury seafood in some Asian countries poses a serious threat to the order.