The tau emerald (Hemicordulia tau), is a species of dragonfly in the family Corduliidae. It is found in all parts of Australia except northern Queensland and north-western Western Australia. The species was first described by Edmond de Sélys Longchamps in 1871.
They are medium-sized dragonflies, reaching a body length of about 50 mm.
- Günther Theischinger and John Hawking (2006). The Complete Field Guide To Dragonflies Of Australia. Collingwood, Victoria: CSIRO Publishing. p. 249.
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