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Re: New paper on fish fingers
Allen Hazen wrote:
> Comment: maybe we shouldn't be too surprised at that.
> There seems to be an analogous situation at the bottom of the mammal
> tree: Trithelodonts are more mammalesque in some features, Tritylodonts > in
> others, and then there's Brazilodon... (Key word: "mosaic
> evolution".) My impression is that dinosaur workers are finding
> something similar at the bottom of birds.
> Maybe it is to be expected that new clades with major
> morphological novelties will arise from "bushes" in which there
> has been extensive "experimentation."
Indeed. As another example... how else can you explain the situation in early
turtle evolution? You have two Late Triassic forms (_Odontochelys_ and
_Chinlechelys_) which show strikingly different morphologies of the dorsal
carapace, with both interpreted as incipient.