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Fig. 3. Detailed ventral view of the internal surface of the Anax junius
dorsal thorax at the base of the forewing, showing the location of the basalar
muscle apodeme (Ba) and the wing fulcrum (Wf) of the forewing (FW). The
distance between these two structures is the muscle apodeme-to-wing fulcrum
lever arm length (d1). All muscle tissue has been removed.
Scale bar, 1 mm. A portion of the wing is drawn to orient the reader; this
wing is not to scale.