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Fig. 1. Sonic mechanism of Carapus boraborensis. (A) Left lateral view of
the first five vertebrae (I-V) with the associated epineural ribs and
swimbladder plate. Numbers on the swimbladder plate indicate its thickness,
which decreases laterally and toward its posterior margin. (B) Schematic left
lateral view of the skeleton (epineural ribs and swimbladder plate removed),
sonic muscles and swimbladder. (C) Inset in B illustrates the helical
organisation of the myofibrils in a single sonic muscle fiber with straight
central myofibrils. SF, swimbladder fenestra; SM, sonic muscle; SP,
swimbladder plate, SW, swimbladder.