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5
votes
2answers
584 views
5
votes
1answer
1k views

Are fish and reptilian scales homologous?

Wikipedia: Fish scales are dermally derived, specifically in the mesoderm. This fact distinguishes them from reptile scales paleontologically. So aren't reptilia scales also dermally derived?
13
votes
1answer
417 views

Do the majority of fish lack scales on their heads?

Based on pictures, it seems to me that a vast majority of fish species that have scales do NOT have scales on their heads. Is that fact true? To make this properly answerable: lets' define a "...
8
votes
2answers
1k views

Did human hairs actually evolve from scales?

What is the evolution of hairs? Did they evolve from scales?