The blue markings of the male individuals of Pseudagrion australasiae and Pseudagrion microcephalum are quite similar to each other. However, Pseudagrion australasiae is slightly larger than Pseudagrion microcephalum. Apart from that, their anal appendages are different as shown in the diagram below:
Anal appendages (left lateral view). Top is Pseudagrion australasiae and bottom is Pseudagrion microcephalum.
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