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4
votes
1answer
54 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?
4
votes
1answer
257 views

What did pangolin scales evolve from?

Were they developed anew or a heritage from fish?
13
votes
1answer
254 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
611 views

Did human hairs actually evolve from scales?

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