| These appendages in the Zoantharia never present the bipinnate arrangement which is observable in the Alcyonaria. |
| The latter are compound, bipinnate, and have fifty pairs of leaflets, which are linear and obtuse and of a grayish green. |
| Its leaves are hairy, bipinnate, with lobed and toothed, ovate or oblong leaflets. |
| Pinna, a primary division with its leaflets of a bipinnate or tripinnate leaf. |
| Some are bipinnate, triangular in shape and have finely cut or toothed leaflets. |
| Lepidopteris is a bipinnate frond whose pinnules resemble some species of Alethopteris. |
