Acanthoxyla prasina

Acanthoxyla prasina, the prickly stick insect, is a stick insect in the order Phasmatodea and the family Phasmatidae. It is native throughout New Zealand, although it is less frequently reported than "common" stick insect species. It has been introduced to Britain, predominantly Cornwall and Devon, and to the south-west region of the Republic of Ireland. It has a thorny skin, which is used as camouflage.

Description
Acanthoxyla prasina occurs in both green and brown colour morphs, displaying an array of black-tipped spines along its body. The species typically measures between 8 cm and 10 cm in length. Acanthoxyla prasina exclusively consists of females. Reproduction occurs without males through a mechanism called obligate parthenogenesis, which is a form of asexual reproduction. Eggs will hatch during the spring and summer and the nymphs undergo multiple molts until they reach adulthood.

Native range
Acanthoxyla prasina can be found throughout New Zealand, where it was originally endemic.

Introduced range
Acanthoxyla prasina has been introduced to the United Kingdom, predominantly Cornwall and Devon, and to the south-west region of the Republic of Ireland. No male had ever been seen within the species or genus Acanthoxyla until 2016 when one was discovered within the introduced population from Cornwall. This single male individual was the result of a rare mutation. It is unknown if the male was capable of producing sperm or inseminating females as the specimen was killed, dried and added to part of the collection at the Natural History Museum in London.