Brachydiplax denticauda is a species of dragonfly in the family Libellulidae known commonly as the palemouth. It is native to Australia, Indonesia, Papua New Guinea, and the Solomon Islands. It lives in habitat with still and slow-moving waters.

Males of this species are typical in colour for the genus, being bright powder blue on both the thorax and abdomen. The labrum is pale cream, thus giving the species its common name of palemouth. In northern Australia, it is found coastal and adjacent inland in an arc from the southern Queensland border to Broome, Western Australia.

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