| Predators mistaking the pinnule tips for the tegmen could take bites out of the distal parts of the pinnules. |
| The most common elements are parallel-veined leaves that resemble cordaites but that could be isolated pinnules of a pinnate leaf. |
| It has the same nodose and scaly root-stock, dark and polished stalk, glaucescent frond and mucronulate pinnules. |
| Fishelson and Nichols observed fish targeting organisms sheltering in the arms and pinnules of living crinoids. |
| Lepidopteris is a bipinnate frond whose pinnules resemble some species of Alethopteris. |
| The branchia is translucent white with brown spots and white-tipped brown pinnules. |
