Nanahughmilleria

Nanahughmilleria Temporal range: Llandovery-Eifelian, 435–387.7 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Carapace of N. prominens
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Subphylum:	Chelicerata
Order:	†Eurypterida
Superfamily:	†Adelophthalmoidea
Family:	†Adelophthalmidae
Genus:	†Nanahughmilleria Kjellesvig-Waering, 1961
Type species
†Nanahughmilleria norvegica Kiær, 1911
Species
†N. clarkei Kjellesvig-Waering, 1964 †?N. lanceolata Salter, 1856 †N. norvegica Kiær, 1911 †N. notosibirica Shpiney, 2012 †?N. prominens Hall, 1884 †N. pygmaea Salter, 1859 †?N. schiraensis Pirozhnikov, 1957

Nanahughmilleria ("dwarf Hughmilleria") is a genus of eurypterid, an extinct group of aquatic arthropods. Fossils of Nanahughmilleria have been discovered in deposits of Devonian and Silurian age in the United States, Norway, Russia, England and Scotland, and have been referred to several different species.

Nanahughmilleria is classified in the family Adelophthalmidae, the only clade in the superfamily Adelophthalmoidea. This clade was characterised by their small size, their parabolic (approximately U-shaped) carapaces and the presence of epimera (lateral "extensions" of the segment) on the seventh segment, among others. Nanahughmilleria was different from its relatives by the presence of more spines in its appendages (limbs) and by its genital morphology. The largest species confidently assigned to the genus was N. norvegica at 10 cm (3.9 in), making it a comparatively small eurypterid.