| In unstalked crinoids, the cirri are located on the end of the calyx opposite the mouth, and are used by the animal to grasp the substratum. |
| Unlike the situation with gastropods, sublethal damage is relatively easy to interpret in ophiuroids and crinoids. |
| Furthermore, physical damage was not an important cause of arm injury when the ophiuroids and crinoids were alive in the late Eocene. |
| Hans perhaps is best known for his work on crinoids and ophiuroids, but he has many titles on asteroids, echinoids, and holothurians as well. |
| Most fossil crinoids have the main visceral body raised above the sea floor by a stem, also called a stalk or column. |
| Equally well represented in these waters are invertebrates such as crinoids, nudibranchs and featherduster worms. |
