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Re: Protopenguins and pterosaurs
David Marjanovic wrote-
On a wall in Paris VI, near the office of Armand de Ricqlès (one of the
many coauthors), there's a poster like what is presented on congresses.
This looks like it's safe for me to publicly mention what it says: an
enantiornithean from Las Hoyas grew fast when it was young. The only
difference to extant birds seems to be that instead of stopping completely,
growth just slowed down drastically, resulting in LAGs in the outer regions
of the bone... while the inner, older parts got remodeled and are thus
usually not available for study.
Cambra-Moo et al., in press. Histological observations of enantiornithine
bone (Saurischia, Aves) from the Lower Cretaceous of Las Hoyas (Spain).
Comptes Rendus Palevol.
The pdf is available online. The specimen is a partial leg.
Interesting how poorly supported most neoavian nodes are in the Waimanu
molecular tree. Basically tells us the unsurprising facts Neoaves,
Charadriiformes and Procellariiformes exist.
I was surprised to see just how poorly Waimanu was supported as a penguin-
"Waimanu is closer to penguins than to any other bird group in the following
combination of characters: some thoracic vertebrae are not heterocoelous;
synsacrum has 11-12 ankylozed vertebrae; hypotarsal crests and grooves of
the tarsometatarsus are not well-developed (but medial hypotarsal crest is
Those look like three plesiomorphic states to me.