Which shark order does the basking shark belong to, demonstrating convergent evolution with Rhincodon?
Answer
Lamniformes
The evolutionary relationship of the whale shark places it closer genetically to carpet sharks within the Orectolobiformes order. In contrast, the basking shark, which fills the same ecological role as a giant filter feeder, belongs to the Lamniformes order. The fact that two species from distinctly different shark orders achieved the massive size and planktivorous diet through filter feeding independently is a classic illustration of convergent evolution. This process was driven by the rich availability of planktonic food resources present in the open ocean environment across vast stretches of geologic time.
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