Triacanthagyna septima is a relatively small darner growing to a total length of 59 to 66 mm; and its thorax (the midsection or tagma of the insect body) is pale green with a brownish wash on the front.
Triacanthagyna septima is a relatively small darner growing to a total length of 59 to 66 mm; and its thorax (the midsection or tagma of the insect body) is pale green with a brownish wash on the front.