| Marine invertebrates include ammonites, echinoderms, bivalves and crustaceans, but infaunal elements are rare. |
| This study concerns all infaunal brachiopods that possess an inarticulate, organo-phosphatic, linguliform shell. |
| Why did some of them choose infaunal life at approximately the same time that other organisms developed mineralized skeletons? |
| Life habit categories included epifaunal, infaunal, shallow infaunal, and deep infaunal. |
| The remaining five deposit-feeding bivalves are infaunal burrowers. |
| Lingulids are shallow burrowing infaunal filter feeders of the shallow intertidal zone. |
