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RE: On the subject of mysterious absences...The Answer
David Marjanovic wrote:
>> wonder if Pterodaustro is the first known filter feeder to have evolved?
> Among reasonably big vertebrates, you mean? Leedsichthys is older (Middle
> Jurassic and later).
_Pseudocetorhinus_ is even older (Triassic). It was an elasmobranch (maybe a
Dan Varner wrote:
> << 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, as only they have seals that shut off the back of the throat (such as
> you use when you gargle) -- probably evolved in association with suckling.">>
> See: http://dml.cmnh.org/2008Feb/msg00330.html
(The filter-feeding croc _Stomatosuchus_ has already been mentioned.)
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