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heterochthon
heterochthon n. 
/ˌhɛtəˈrɒkθɒn/, /ˌhɛdəˈrɑkˌθɑn/ that element of the fauna of a given region which is not indigenous to the region, but which is due to immigration.
Brit. /ˌhɛtəˈrɒkθ(ə)n/
, /ˌhɛtəˈrɒkθ(ə)n//ˌhɛtəˈrɒkθɒn/U.S. /ˌhɛdəˈrɑkθ(ə)n/
, /ˌhɛdəˈrɑkθ(ə)n//ˌhɛdəˈrɑkˌθɑn/ΚΠ
1903 Amer. Naturalist 37 350 The parasitic worms of the holarctic region are not found with the indigenous (autochthon) mammals or birds, but only with the strangers (heterochthon) that immigrated at a late period.
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