| The most common elements are parallel-veined leaves that resemble cordaites but that could be isolated pinnules of a pinnate leaf. |
| Predators mistaking the pinnule tips for the tegmen could take bites out of the distal parts of the pinnules. |
| Lepidopteris is a bipinnate frond whose pinnules resemble some species of Alethopteris. |
| Fertile fronds have clusters of elongate sporangia that partially replace pinnules. |
| If the primary pinnae are divided, then the individual divisions are known as pinnules. |
| Fishelson and Nichols observed fish targeting organisms sheltering in the arms and pinnules of living crinoids. |
