The appendages of wingspanroaches and turtles are modified for creeping movements, but their internal structures are completely different from each other's. What could be the possible interpretation for this similarity?

Question

anonymous · Answer

Convergent evolution - these species probably developed from different ancestors, meaning most of their internal structures developed independently. However, they probably live in similar environments, and so developed similar adaptations for it.

Similar idea to bird wings vs bat wings - different ancestors, but same environment/function.