Lygromma anops is one of only three known eyeless spiders in the superfamily Gnaphosoidea

Gnaphosoidea

The Gnaphosoidea are a superfamily of araneomorph, mostly eight-eyed spiders, with seven families:* Ammoxenidae* Cithaeronidae * Gallieniellidae* Gnaphosidae* Lamponidae* Prodidomidae* Trochanteriidae...

, and one of only two known troglobite

Troglobite

Troglobites are small cave-dwelling animals that have adapted to their dark surroundings. Troglobite species include spiders, insects, fish and others. They live permanently underground and cannot survive outside the cave environment. Troglobite adaptations and characteristics include a heightened...

s (cave species). It is found in lava

Lava

Lava refers both to molten rock expelled by a volcano during an eruption and the resulting rock after solidification and cooling. This molten rock is formed in the interior of some planets, including Earth, and some of their satellites. When first erupted from a volcanic vent, lava is a liquid at...

 caves on Isla Santa Cruz, Galápagos.

It is possible that L. anops, like many inhabitants of lava caves, colonizes new caves through interconnecting cracks and crevices, and that these small spaces are in reality its main habitat.

Males reach a body length of about 3.4 mm.

L. anops seems to be closely related with L. senoculatum, L. valencianum and L. huberti from Venezuela

Venezuela

Venezuela , officially called the Bolivarian Republic of Venezuela , is a tropical country on the northern coast of South America. It borders Colombia to the west, Guyana to the east, and Brazil to the south...

.

Lygromma gertschi, a blind, cave-inhabiting species from 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...

is not a close relative of L. anops.