[1] Haaniella grayii has the genus-typical sharp spines distributed over the body and legs in both sexes.

Also typical of the genus are the strongly shortened forewings, developed as tegmina, which completely cover the short hindwings, which have been transformed into stridulation organs.

The spine shaped ovipositor is formed dorsally by the supraanal plate, which corresponds to the eleventh tergum.

Unlike the other Haaniella species native to Borneo, it is longer than the lower part of the ovipositor, which is called the subgenital plate and consists of the eighth sternite.

In the latter they stand in addition to other green areas in the ventral head and the meso- and metasternum in contrast to the red-brown colored sternite edges and the coxae themselves.

The defensive behavior typical of the subfamily, consisting of spreading the held up, spiked hind legs and closing them when touched by an attacker, can also be observed in H. grayii.

The male from the London Natural History Museum, which also belongs to this series, shows the spines typical of H. grayii and otherwise corresponds to Westwood's illustration contained in the description.

Medium-sized to large terrariums with suitable hiding places are required to keep Haaniella grayii.

For laying eggs, the floor of the terrarium should be covered with an 8 to 10 centimetres (3.1 to 3.9 in) thick layer of a suitable, always slightly moist substrate.

Diet is not a problem, because they eat leaves of bramble, elderberry, ivy, oak, hawthorn and firethorn, eucalyptus, salal and other plants.