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Re: On the subject of mysterious absences...The Answer



I wonder if Pterodaustro is the first known filter feeder to have evolved?

James

jrc wrote:
Unlike flamingos, Pterodaustro seems to have filter fed by swinging the lower mandible aftward through the water, creating a pair of counter-rotating eddies around the mandible that swirled water and particulates into position inside the filter -- and then swinging the lower mandible back forward, to expell the water through the filter while trapping the particulates. No gullet mechanism involved, whether they had one or not.
JimC


----- Original Message ----- From: <Danvarner@aol.com>
To: <dinosaur@usc.edu>
Cc: <danchure@easilink.com>
Sent: Saturday, April 19, 2008 7:23 PM
Subject: Re: On the subject of mysterious absences...The Answer


In a message dated 4/19/2008 8:00:38 PM Eastern  Daylight Time,
danchure@easilink.com writes:

<< Briefly: if you want to filter feed without gills, you need to take in a
large amount of water and then somehow stop it going down your gullet before
you spit it out past filtering surfaces such as baleen . Only mammals can do
this,