Page 334 - Introduction to Paleobiology and The Fossil Record
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SPIRALIANS 1: LOPHOPHORATES 321
0.08
Genus extinction standing diversity (myr) 0.04
0.06
0.02
0
125 100 75 50 25 0
Time (Ma)
(a)
encrusting genera
erect genera
0.05
Genus extinction standing diversity (myr) 0.03
0.04
0.02
0.01
0
125 100 75 50 25 0
Time (Ma)
(b)
Figure 12.19 Distribution of (a) cyclostome and (b) cheilostome bryozoans across the Mesozoic–
Cenozoic boundary: the cheilostomes suffered the heaviest losses while the erect genera of both
groups suffered more than the encrusters. (Replotted from McKinney & Taylor 2001.)
