Curated Tumblr

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What’s in a name? (i.imgur.com)

submitted 11 months ago by [email protected] to c/[email protected]

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[–] [email protected] 1 points 11 months ago (1 children)

Yes, fish would be a morphology that includes gills, fins, streamlined body shape for swimming, etc. But there is no good phylogenetic definition because all the animals we call "fish" do not form a monophyletic group. The monophyletic group encompassing all fish would include also mammals, reptiles including birds, and amphibians because these all have fish ancestors

[–] [email protected] 1 points 11 months ago (1 children)

But there is no good phylogenetic definition because all the animals we call “fish”

The challenge was to come up with a group "which includes both trout and sharks but not humans". It seems like "gills" satisfies that pretty well.

[–] [email protected] 1 points 11 months ago

Animals with gills do not form a monophyletic group.