Kauai cave wolf spider
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Order: Araneae
Suborder: Araneomorphae
Family: Lycosidae
Binomial name: Adelocosa anops

[Photo] Kauai Cave Wolf Spider (Adelocosa anops). Source: Source US Fish & Wildlife Service. Date March 03 2006. Author Gordon Smith

The Kaua‘i cave wolf spider, also known to local residents as the "blind wolf spider", is only known to occur in a few caves in a 10.5 km² lava flow in the Koloa-Poipu region of Kaua‘i, Hawaiian Islands , and only six populations are known to exist. While their nearest surface-dwelling relatives have large eyes, this species has completely lost its eyes. They reach a body length of about 20mm, are reddish brown and completely harmless to people. Unlike most wolf spiders, it produces only 15 to 30 eggs per clutch. The female carries the egg sac in her mouthparts until the spiderlings hatch.

One of its primary prey species is the Kaua‘i Cave Amphipod (Spelaeorchestia koloana), which is only known from nine populations and reaches about 10mm in length. These feed on decomposing plant matter. Like the wolf spider, they are blind, although they do have eyes. Both species were discovered in 1971. Counts have never documented more than 30 spiders or 80 amphipods.

http://en.wikipedia.org/wiki/Kauai_cave_wolf_spider

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