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Re: tibiofibular crests

For a functional perspective on the tibiofibular crest, check out:

G. B. Muller. 1990. Developmental mechanisms: a side-effect hypothesis; in M. H. Niteki (Ed.), Evolutionary Innovations.

For a popular account, read Carl Zimmer's excellent little book ... whose name I now forget! Arrg! Anyway, it is something like: Fish With Fingers and Mammals with Fins, or some such derivation. If someone on the list knows, please post. It is an excellent book.

Later for now,
Matt Bonnan

From: "John R. Hutchinson" <jrhutch@socrates.berkeley.edu>
Reply-To: jrhutch@socrates.berkeley.edu
To: dinosaur@usc.edu
Subject: Re: tibiofibular crests
Date: Mon, 14 Feb 2000 07:54:34 -0800

Best discussion of this is in Chiappe 1996 (Munchner
Geowissenschaftliche Abhandlungen Reihe A 30; specifically on pp.
233-234).  The TFC is a synapomorphy for Ornithothoraces at least,
but presence in recently discovered basal birds suggests that it is
more primitive (although Archaeopteryx lacks it, as do more basal
Maniraptora).  It's an interesting character whose functional
implications are poorly understood but may turn out to be very
interesting (evolution of knee flexion, etc.).  Ectocondylar tuber
"does not separate the lateral condyle into two surfaces for the
articulation of the tibia and fibula," unlike the TFC.

Date: Sun, 13 Feb 2000 01:00:57 -0800
From: "Mickey Mortimer" <mickey_mortimer@email.msn.com>
To: <dinosaur@usc.edu>
Subject: tibiofibular crests
Message-ID: <099844501090d20CPIMSSMTPU08@email.msn.com>

While I was adding to my character list for my upcoming coelurosaur
analysis, I came across the synapomorphy of a tibiofibular crest. I noticed
this is homologous to the ectocondylar tuber. Can anyone tell me when an
ectocondylar tuber becomes a tibiofibular crest? What is the characteristic
that distinguishes them? Thanks in advance.

John R. Hutchinson
Department of Integrative Biology               Phone:  (510) 643-2109
3060 Valley Life Sciences Bldg.                 Fax:    (510) 642-1822
University of California
Berkeley, CA 94720-3140

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