Nihoa is a genus of South Pacific brushed trapdoor spiders first described by Tracey Churchill and Robert Raven in 1992. It is named after the island Nīhoa, where the type species (N. mahina) is endemic.
Male N. hawaiiensis grow to almost 15 millimetres (0.59 in) long, including chelicerae. The females are larger, growing up to 21 millimetres (0.83 in).
Species
As of April 2019 it contains twenty-three species:
Nihoa annulata (Kulczyński, 1908) – New Guinea
Nihoa annulipes (Thorell, 1881) – New Guinea
Nihoa aussereri (L. Koch, 1874) – Palau Is.
Nihoa bisianumu Raven, 1994 – New Guinea
Nihoa courti Raven, 1994 – New Guinea
Nihoa crassipes (Rainbow, 1898) – New Guinea
Nihoa gressitti Raven, 1994 – New Guinea
Nihoa gruberi Raven, 1994 – Papua New Guinea (New Ireland)
Nihoa hawaiiensis (Raven, 1988) – Hawaii
Nihoa itakara Raven, 1994 – New Guinea
Nihoa kaindi Raven, 1994 – New Guinea
Nihoa karawari Raven, 1994 – New Guinea
Nihoa lambleyi Raven, 1994 – New Guinea
Nihoa madang Raven, 1994 – New Guinea
Nihoa mahina Churchill & Raven, 1992 (type) – Hawaii
Nihoa maior (Kulczyński, 1908) – New Guinea
Nihoa mambulu Raven, 1994 – Solomon Is.
Nihoa pictipes (Pocock, 1899) – New Guinea, Papua New Guinea (New Britain, New Ireland), Solomon Is.
Nihoa raleighi Raven, 1994 – New Guinea
Nihoa tatei Raven, 1994 – New Guinea
Nihoa vanuatu Raven, 1994 – Vanuatu
Nihoa variata (Thorell, 1881) – New Guinea
Nihoa verireti Raven, 1994 – New Guinea