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Re: AW: Heterodontosaurid with protofeathers
What about ophiacodonts - they had dermal belley scales at least right?
Were these homologous to the scales on a fish? such as a Queensland lungfish?
Is there any evidence that can give us an insight into when tetrapods lost
their "fish scales"?
Might it have happened independently in saurodsids and synapsids?
I once had a leopard gecko - the skin under its throat was really soft, and
whatever scales it had must have been really small- it didn't look obviously
scaly/bumpy like its back - how certain is it that these skin impressions show
naked skin, as opposed to skin with really really small and thin/flexible
Since scales and fur are both subdermal - I can't help but think they may be
--- On Tue, 3/31/09, K and T Dykes <email@example.com> wrote:
> From: K and T Dykes <firstname.lastname@example.org>
> Subject: Re: AW: Heterodontosaurid with protofeathers
> To: email@example.com
> Cc: firstname.lastname@example.org
> Date: Tuesday, March 31, 2009, 11:21 PM
> <<We have evidence of fur in
> _Docodonta_ and (of course) in _Mammalia_, so it probably
> existed in some common ancestor of those two clades, but not
> prior to the sauropsid-synapsid split. In fact, since
> _Estemmenosuchus_, a dinocephalian stem-mammal, is supposed
> to have been scaly, it may have been after the
> dinocephalian-neotherapsid split (see:
> /Castorocauda/ was "scaly", Mike. The scales are on
> the tail. Ask a mouse about synapsid scales.