Belgium
A grass unique to
Belgium, the Brome of the Ardennes Bromus
bromoideus (Wikipedia),
apparently extinct in the wild has been successfully germinated at
Kew's Royal Botanic Gardens (European
Research Headlines).
Among the invertebrate species described from Belgium and not known
from elsewhere are a parasitic wasp Cleruchus
raignieri (Universal Chalcidoidea Database) and a sheetweb spider Diplocephalus caecus (araneae).
Two freshwater diatoms, Eunotia belgica and Encyonopsis horticola, were recently described from Belgium (IngentaConnect).