On the evolution of lobe of Anomalocaris possible
morphological change could be classified into the
following three patterns as summarized in Fig. 4. Type
1: At first tiny thin appendage is generated perpendicular
to the body, and then its width increases through
evolution (Figs. 4A–C). Type 2: Primitive Anomalocaris
already had broad lobe (Fig. 4D), and then depth of
lobe gradually grows as Figs. 4(D)–(C). Type 3:
Primitive Anomalocaris had fewer lobes than the
completed form of 14 lobes (Fig. 4F). However, number
of lobes increases through evolution up to the final form
of Anomalocaris, whose evolutional pattern is similar
like trilobite development (Forty, 2001).
To judge fairly characteristics of these three, type 3
requires systematic genetic change compared to the
change of size of a organ in Types 1 and 2. So it might be
said that evolution by the pass of Type 1 or Type 2 is
plausible than the structural change of Type 3. In many