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Re: Flightless bat? Flightless pterosaur?



On the subject of flightless pterosaurs - considering the tendency for birds
to lose flight on islands, I would be surprised if flightless pterosaurs
didn't exist. However, the chances of finding one is very unlikely (IMHO),
considering they would most likely be found on "smaller" islands - not
exactly prominent in the geologic record. It was once suggested to me that
the coast of California, with its accreted terranes, would be the place to
look.
Peace,
Rob

Student of Biology
Northern Arizona University
400 E. McConnell Dr. #11
Flagstaff, Az. 86001
http://dinodomain.com
http://www.cafepress.com/robsdinos
----- Original Message ----- 
From: "David Peters" <davidrpeters@earthlink.net>
To: <qilongia@yahoo.com>; "dinosaur list" <dinosaur@usc.edu>
Sent: Monday, January 26, 2004 6:11 AM
Subject: Flightless bat? Flightless pterosaur?


> Jaime Headden wrote:
>
> Potentially, a flightless bat can occur, as much as a flightless
> pterosaur.
>
> >>>>>
>
> If bats and pterosaurs hatched from eggs, yes. They could walk out of
> the nest and fend for themselves after a suitable rearing period.
>
> But they don't.
>
> Both are born and hang on to their dear mother until mature enough, no
> sooner than 50 percent the size of the adult. More of the story will be
> out before summer.
>
> All putative pterosaur babies are tiny adults. They are the result of
> phylogenetic size squeezes (as in early mammals, birds, dinosaurs). At
> least that's what my good old single-tree cladogram tells me.
>
> You can tell the immature fenestrasaurs (including pterosaurs) from tiny
> adults because the tibiae are shorter than the femora in juvies. That
> helps them keep four on the floor, so to speak. Also, they don't ossify
> until independence. Ironically they have slightly smaller orbits. So
> they're not particularly "cute".
>
> It all goes back to Cosesaurus and Longisquama, as you'll see. They all
> go through a bit of metamorphosis when puberty kicks in.
>
> David Peters
> St. Louis
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