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Features/characteristics that are derived and novel to a particular species is being defined as an apomorphy.
Apomorphy of Planaxidae includes:
1. Rachidian tooth with medially placed cusps (Houbrick 1987) [Link]
2. Broad, flared snout (Houbrick 1987) [Link]
3. Smooth mantle edge (Houbrick 1987) [Link]
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