Tonyosynthemis ofarrelli, more commonly known as the slender tigertail,[4] is a species of Odonata from the family Synthemistidae.

[3] As an adult, Tonyosynthemis ofarrelli is a predator, feeding on smaller dragonflies and larvae.

[3] Samples of larvae and exuviae were collected at multiple sites in the 1990s in north-eastern New South Wales, Australia.

[5] The collected female specimen's hindwing was about 34.2 millimetres (1.35 in), with an abdomen measuring about 36.5 mm (1.44 in).

The female's head was dark brown in colour, with a small yellow spot below its eyes.