Page 346 - Introduction to Paleobiology and The Fossil Record
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SPIRALIANS 2: MOLLUSKS 333
1 coiled
gastropods cephalopods
10 2 planispiral forms
expansion rate (W) 10 4 bivalves brachiopods 0.6 0.8 1.0
10
curve from axis
0.4
0.2 distance (D) of generating
10 6
4 3 2 1 0
translation rate (T)
(a)
Buccinum Epitonium Ceratomya
Gryphaea Dactylioceras
(b)
Figure 13.4 Theoretical morphospace created by the computer simulation of shell growth (a) and
some computer simulations matched with reality (b). (a, based on Raup 1966; b, from Swan
1990.)
