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5
votes
1answer
98 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
266 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
648 views

Did human hairs actually evolve from scales?

What is the evolution of hairs? Did they evolve from scales?
4
votes
1answer
268 views

What did pangolin scales evolve from?

Were they developed anew or a heritage from fish?