More ignorane. Natural selection is a process of selecting traits. The emergence of truly new traits is a proposed function of beneficial mutation (deformity doesnt count.) a single fossil or similar features does not inherently prove mutation and conmon ancestry. You would need to genetically map the lineage of the two organisms and determine that in fact they were related and that tge trait in question arose spontaneously from the pre existing gene pool and them facilitated reproductive isolation of the new subpopulation of organisms (speciation) "they look similar" was good enough in the 19th century.

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