Plectreuridae

Common Name

Plectreurid spiders

Overview

The Plectreuridae family, also known as plectreurid spiders, comprises a small group of primarily nocturnal arachnids. They are found mainly in the southwestern United States and Mexico.

Taxonomy

Key Characteristics

  • Two distinct rows of eyes with six or eight eyes in total.
  • Long, curved chelicerae adapted for catching prey.
  • Robust bodies and legs.
  • Most species present pale colors, often tan or light brown.

Life Cycle

Plectreurid spiders undergo complete metamorphosis which includes the stages of egg, spiderling, and adult. Females lay eggs in silk sacs, which they guard until the spiderlings emerge.

Behavior and Ecology

  • Primarily nocturnal hunters.
  • They spin irregular webs, often found in crevices or under rocks.
  • Known to prey on a variety of small insects and other arthropods.
  • Solitary and largely not aggressive towards humans.

Notable Species

  • Plectreurys tristis : One of the more frequently encountered species in this family, noted for its pale coloring and size.

Conservation

There are currently no species within the Plectreuridae family listed as endangered. Their habitats in desert and semi-desert regions provide relative stability, though habitat loss could become a concern.

Significance to Humans

Plectreurid spiders are not considered dangerous to humans. They can help control insect populations in their habitats.

Fun Facts

  • Plectreurid spiders are one of the few spider families with both six and eight-eyed species.
  • They have remarkably strong silk for their size.
  • These spiders are adept at hiding, often found under stones or within leaf litter.
  • Fossil records suggest the family dates back to the Jurassic period.