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species and genus

species and genera have been known to last for much longer than the
0.5-1.5 Ma quoted in the a recent post.  only index fossil species 
generally evolve that rapidly.  for most of the paleontological 
record, species last much longer and genera even longer still.
look at the longevity of some molluscs and plants for example.

Bonnie A.B. Blackwell,                          bonn@qcvaxa.acc.qc.edu
Dept of Geology,                                off: (718) 997-3332
Queens College, City University of New York,    fax: (718) 997-3299
Dept of Earth \& Environmental Sciences,        fax: (718) 997-3349
The Graduate Center, CUNY,                      fax: (718) 997-3513
Flushing, NY 11367-1597                         messages: (718) 997-3300