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- Geologic time scale (26014 bytes)
92: ...leost]] fish appear, as do many modern [[insect]] clades. - Lepospondyli (3903 bytes)
21: ...to early [[Permian]] [[tetrapod]]s. Six different clades are known, the [[Acherontiscus|Acherontiscidae]],...
25: ...mmon ancestors are known, since each of the known clades are already highly specialised when they first ap... - Brittle star (5616 bytes)
- Ornithopod (3077 bytes)
- Ornithopoda (3077 bytes)
- Linnaean classification (11503 bytes)
53: ...ation. In this approach taxa are identified with clades, i.e., they can only be monophyletic. In these a...
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