About Pseudagrion australasiae Selys, 1876
Pseudagrion australasiae Selys, 1876 is a medium-sized damselfly. Males have blue eyes that are dark on top, with a pale blue back of the head bordered in black. Their thorax is azure blue, marked with broad black dorsal and humeral stripes. Abdominal segments 1 and 2 are blue with black marks on the dorsum; the mark on segment 2 is vase-shaped, broadly expanded at the middle. Segments 3 through 7 are black on the dorsum and blue on the sides, and each of these segments has a narrow blue apical annule. Segments 8 and 9 are blue with a narrow black apical fringe. Segment 10 is blue on the sides, and has a broad X-shaped black mark on its dorsum. The superior anal appendages are black, diverging outward, and curving inward at their apices like hooks; they are bifid at the apices, and half the length of segment 10. The inferior anal appendages are the same length as the superior anal appendages. This species can be distinguished from Pseudagrion microcephalum, Pseudagrion spencei, and Pseudagrion malabaricum by its short anal appendages. It can be further distinguished from Pseudagrion malabaricum by the bifid apices of its superior anal appendages. Females have bluish green eyes and thorax, with the same marking pattern seen in males. Their abdomen shares the same color pattern as the male abdomen, but is paler overall. In females, segments 8 and 9 are black with fine apical blue rings, and segment 10 is pale blue. This damselfly breeds in ponds, lakes, paddy fields, and marshes.
