Lygromma is a spider genus of Central

Central America

Central America is the central geographic region of the Americas. It is the southernmost, isthmian portion of the North American continent, which connects with South America on the southeast. When considered part of the unified continental model, it is considered a subcontinent...

 and South America

South America

South America is a continent situated in the Western Hemisphere, mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere. The continent is also considered a subcontinent of the Americas. It is bordered on the west by the Pacific Ocean and on the north and east...

. There are species with eight, six (eg., L. senoculatum, L. valencianum) and no eyes. The eyeless L. anops is endemic to Galapagos, while the not closely related blind L. gertschi is found only on Jamaica

Jamaica

Jamaica is an island nation of the Greater Antilles, in length, up to in width and 10,990 square kilometres in area. It is situated in the Caribbean Sea, about south of Cuba, and west of Hispaniola, the island harbouring the nation-states Haiti and the Dominican Republic...

.

The Mexican genus Tivodrassus, and Tricongius have been suggested as sister groups of Lygromma.

Species reach a body length from about 2 to 4.6 mm.

Species

• Lygromma anops
  Lygromma anops
  Lygromma anops is one of only three known eyeless spiders in the superfamily Gnaphosoidea, and one of only two known troglobites . It is found in lava caves on Isla Santa Cruz, Galápagos.It is possible that L...
  
  Peck & Shear, 1987 — Galapagos Islands
• Lygromma chamberlini Gertsch, 1941 — Panama, Colombia, Cuba
• Lygromma domingo Platnick & Shadab, 1981 — Ecuador
• Lygromma dybasi Platnick & Shadab, 1976 — Costa Rica, Panama
• Lygromma gasnieri Brescovit & Höfer, 1993 — Brazil
• Lygromma gertschi Platnick & Shadab, 1976 — Jamaica
• Lygromma huberti Platnick & Shadab, 1976 — Venezuela, Brazil
• Lygromma kochalkai Platnick & Shadab, 1976 — Colombia
• Lygromma peckorum Platnick & Shadab, 1976 — Colombia
• Lygromma peruvianum Platnick & Shadab, 1976 — Peru
• Lygromma quindio Platnick & Shadab, 1976 — Colombia
• Lygromma senoculatum Simon, 1893 — Venezuela
• Lygromma simoni (Berland, 1913) — Ecuador
• Lygromma taruma Brescovit & Bonaldo, 1998 — Brazil
• Lygromma tuxtla Platnick, 1978 — Mexico
• Lygromma valencianum Simon, 1893 — Venezuela
• Lygromma volcan Platnick & Shadab, 1981 — Panama
• Lygromma wygodzinskyi Platnick, 1978 — Colombia
• Lygromma ybyguara Rheims & Brescovit, 2004 — Brazil