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RE: Coelacanth article in current NatGeo
> From: owner-DINOSAUR@usc.edu [mailto:owner-DINOSAUR@usc.edu]
> On Behalf Of Erik Boehm
> > > Maybe my understanding of
> > their diversity is wrong, but it seems odd
> > > that at one point there were so many fleshy
> > finned fish, and now
> > > there are almost none.
> > A couple of mass extinctions.
> Of course, but prior to those, the lobe fins were not
> restricted to bottom/river dwellers correct? if so, what
> purpose did those fleshy fins serve?
> Its my understanding the basal lobe fins did not live in
> rivers, or along the sea floor, where such fins may have been
> useful for holding the fish against a surface. What was the
> original use?
While it is true that ancestral sarcopts were likely marine, that doesn't mean
that they weren't demersel (near-bottom swimmers).
Many modern fish are prefectly good swimmers but hang around rocky or muddy
surfaces, if for no more reason than nutrients tend to
Thomas R. Holtz, Jr.
Email: email@example.com Phone: 301-405-4084
Office: Centreville 1216
Senior Lecturer, Vertebrate Paleontology
Dept. of Geology, University of Maryland
Faculty Director, Science & Global Change Program, College Park Scholars
Mailing Address: Thomas R. Holtz, Jr.
Department of Geology
Building 237, Room 1117
University of Maryland
College Park, MD 20742 USA