![]() The paler head-end extends forward, becoming as thin as the lead in a pencil. When it starts to move, it uncurls, at the same time as the circular muscles beneath the epidermal cells at the anterior end contract. triangulatus rolls itself up and can appear like a very tiny Swiss roll. One egg capsule is produced at a time with the bulge clearly visible in the dorsum of the adult worm. After an unknown incubation period, several pale, tiny flatworms hatch out of the brittle capsule. The capsules are shiny, flexible and cherry red in colour at first and later darken to black after several days. Reproduction involves the production of egg capsules of about 8 mm in length. They may also be found beneath the soil surface hunting for earthworms. Young flatworms vary in colour from white to pale orange and develop their adult colouration as they grow.ĭuring the day, flatworms can be found resting on the surface of soil underneath objects in close contact with the ground. The ventral surface of the flatworm is a pale buff colour while the dorsal surface is dark brown. This implies that this species cannot be imported, bred, transported, commercialized, or intentionally released into the environment in the whole of the European Union. ![]() ![]() This species is included since 2019 in the list of Invasive Alien Species of Union concern (the Union list). The New Zealand flatworm is considered an invasive species in parts of Europe. It can vary from 5 mm in length when hatched to approximately 17 centimetres (6.7 in) in mature adults. The New Zealand flatworm ( Arthurdendyus triangulatus) is a large land flatworm native to New Zealand.
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