The Duchy was one of the smallest European nations to colonize overseas territories, establishing short-lived outposts on the Caribbean islands of Tobago and Trinidad and at the mouth of the Gambia River in Africa.
During the following year he was tasked by the colonial governor to recognize the sources of the Senegal and Gambia rivers.
It was described by Gustafsson in 1972 and is endemic to Gambia where it was discovered in Gambia River which flows between Basse Santa Su and Banjul.
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Although Mandinka-speaking Africans always referred to the state along the north bank of the Gambia River's estuary as Niumi, not everyone did.
It is found exclusively in swamps and near vegetated edges in the Nile, Turkana, Chad, Niger, Volta, Senegal, and Gambia basins.