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The New Zealand flatworm (''Arthurdendyus triangulatus'') is a large land flatworm native to New Zealand. It can vary from 5 mm in length when hatched to approximately in mature adults. The ventral surface of the flatworm is a pale buff colour while the dorsal surface is dark brown. Young flatworms vary in colour from white to pale orange and develop their adult colouration as they grow. During the day, flatworms can be found resting on the surface of soil underneath objects in close contact with the ground. They may also be found beneath the soil surface hunting for earthworms. Reproduction involves the production of egg capsules of about 8 mm in length. The capsules are shiny, flexible and cherry red in colour at first and later darken to black after several days. After an unknown incubation period, several pale, tiny flatworms hatch out of the brittle capsule. One egg capsule is produced at a time with the bulge clearly visible in the dorsum of the adult worm. ==Invasive species== The New Zealand flatworm is an invasive species in Europe, feeding there almost exclusively on earthworms.〔Jones, H. D. 2005: Identification: British land flatworms. British Wildlife, 16, 189-194. (Full text )〕 This degrades soil quality. European earthworm predators are reluctant to eat it although cases of frogs and beetle larvae consuming flatworms have been recorded. It has been seen in England, Scotland, Northern Ireland and the Faroe Islands. It might have arrived in the early 1960s, being first recorded in Belfast in 1963. The New Zealand flatworm is easily transported accidentally in plant pots in adult or egg form. They tend to be common in garden centres and may have arrived in the UK with exotic plants. It has been suggested that they might thrive in parts of western Norway, southern Sweden, Denmark, Germany and northern parts of Poland, if they invade these regions.〔Boag, B., Evans, K.A., Neilson, R., Yeates, G.W., Johns, P.M., Mather, J.G., and Christensen, O.M. (1995). The potential spread of terrestrial planarians ''Artioposthia triangulata'' and ''Australoplana sanguinea'' var. ''alba'' to continental Europe. Annals of Applied Biology 127: 385-390.〕 Similar invasions of other terrestrial planarians are occurring in many other parts of the world.〔Ogren, R. E. and M. Kawakatsu. 1998. American Nearctic and Neotropical land planarian (Tricladida: Terricola) faunas. Pedobiologia 42 441-451.〕 For example, planarians of the genus ''Bipalium'' are widely distributed in North America,〔Ducey, P. K., L-J. West, G. Shaw, J. DeLisle. 2005. Reproductive ecology and evolution in the invasive terrestrial planarian Bipalium adventitium across North America. Pedobiologia 49:367-377.〕 and planarians of the genus ''Platydemus'' on many islands in the Pacific.〔Sugiura, S. 2010. Prey preference and gregarious attacks by the invasive flatworm Platydemus manokwari. Biological Invasions 12:1499-1507.〕 ''Platydemus manokwari'' has recently (2013) been found in Europe.〔 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「New Zealand flatworm」の詳細全文を読む スポンサード リンク
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