Orestes dittmari is a species of stick insects in the subfamily Dataminae (tribe Datamini).

In front of and behind the eyes there are usually paired, clear spines that show a species-specific expression (see also Acanthotaxy of Heteropterygidae).

The spines of the anterior coronal located behind are strongly flattened on the sides and rounded to the tip.

Behind the eye, a clear edge (postocular carina) extends backwards, where it leads to a conical tubercle.

In addition to the structures on the head, a clear expansion of the mesonotum to the rear is typical of the species.

[1][2] The nocturnal animals, like all members of the genus, are able to achieve an almost perfect phytomimesis by aligning legs and antennae along the body and so hardly from a short broken branch are to be distinguished.

'Tây Yên Tử' Orestes japonicus 'Okinawa' Orestes dittmari Joachim Bresseel and Jérôme Constant found a female on July 7, 2013 and a male of this species on July 13, 2013 in the bay of Hạ Long in the Cát Bà National Park.

The male was deposited as holotype, the female and two eggs as paratypes in the Museum of Natural Sciences in Brussels.

[3] The first and so far only breeding stock of this species in terrariums goes back to eggs laid by the female collected in Vietnam in 2013 by Bresseel and Constant.