J. David Archibaldn
and Norman MacLeodw
San Diego State University and w
Natural History Museum
I. Yet Another Dante's Inferno
II. Multiple Causes
III. Long-Term Trends in Dinosaur Diversity
IV. Short-Term Trends in Dinosaur Diversity
V. Out with a Whimper, a Bang, or Both?
ammonites Shelled group of invertebrates related to
octopus, squid, and nautilus.
amniota Taxon of vertebrates including mammals
and reptiles (including birds).
archaic ungulates (or condylarths) Extinct group or