Luxembourg
Among the invertebrates known solely from Luxembourg are several springtails including Orchesella hoffmanni (p. 2 of Ferrantia pdf file), Superodontella euro (Bull. Soc. Nat. luxemb. pdf file), Hymenaphorura arantiana (Bull. Soc. Nat. luxemb. pdf file), and Kalaphorura ludzaki (isez.pan.krakow.pl pdf file). Other endemic invertebrates include a proturan Eosentomon luxembourgense (biol.uni.wroc.pl pdf file) and a non-biting midge Pseudorthocladius cristagus (UMMZ pdf file).
A vascular plant apparently known only from Luxembourg is a microspecies of dandelion Taraxacum leucosquameum (SEKJ pdf file).