| order | extinct plants having tall arborescent trunks comparable to or more advanced than cycads |
|---|---|
| order | an order of insects: includes booklice and barklice |
| order | crocodiles |
| order | crocodiles |
| order | cuckoos |
| order | primitive tropical gymnosperms abundant in the Mesozoic, now reduced to a few scattered tropical forms |
| order | fossil gymnospermous trees or climbing plants from the Devonian: seed ferns |
| order | primitive jawless aquatic vertebrate: lampreys |
| order | ctenophores having two long pinnate tentacles |
| order | ctenophores having two long pinnate tentacles |
| order | ctenophores having two long pinnate tentacles |
| order | an order of animals including almost entirely freshwater fishes: characins |