Biology Reference
In-Depth Information
origin of flatfish asymmetry resembles its developmental origin, with increas-
ing degrees of orbital migration transforming a symmetrical precursor into a
fully asymmetric form” (
Friedman, 2008
)(
Fig. 6.10
). If modern flatfish on-
togeny also recapitulates other aspects of their phylogeny, then studying
the larval development and metamorphosis of these fascinating creatures
may further our understanding of their evolution. For example, it has been
shown for southern flounder that transitions to lateralized swimming postures
and initiation of benthic settling and hiding behaviors are initiated prior to eye
migration (
Schreiber, 2006
). These observations would support a hypothesis
that the bilaterally symmetrical flatfish ancestor was a benthic fish with already
established lateralized behavior (e.g., lying on one side and burrowing into the
substrate for ambush or shelter); eye migration and craniofacial asymmetry
may have evolved later to accommodate a preexisting lateralized behavior.
ACKNOWLEDGMENTS
The author is particularly grateful to the following for allowing reproduction of their
previously published figures: Dr. Tohru Suzuki (
Fig. 6.4
), Dr. Hisashi Hashimoto
(
Fig. 6.5
), Dr.
ivind Andersen (
Fig. 6.6
), Dr. Baolong Bao (
Fig. 6.8
), Dr.
ystein Sæle
(
Fig. 6.9
), and Dr. Matt Friedman (
Fig. 6.10
).
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