Segestriidae

Common Name

Tube web spiders

Overview

The Segestriidae family consists of medium-sized, crevice-dwelling spiders known for their unique tubular webs built in cracks and crevices, often in walls or under bark.

Taxonomy

• Kingdom: Animalia
• Phylum: Arthropoda
• Class: Arachnida
• Order: Araneae
• Family: Segestriidae

Key Characteristics

• Cylindrical body shape
• Six eyes arranged in three groups of two
• Long, cylindrical legs adapted for living in confined spaces
• Spin long silk tubes to serve as retreats
• Typically have a dark or muted coloration

Life Cycle

• Eggs are laid within a silk sac
• Spiderlings emerge and disperse
• Undergo several molts before reaching adulthood
• Lifespan can vary from one to a few years

Behavior and Ecology

• Nocturnal hunters that capture prey from the entrance of their tubular webs
• Use their long front legs to detect vibrations from prey
• They can be aggressive if provoked, although they are generally shy
• Found under bark, in rocks, and in man-made structures

Notable Species

• Segestria florentina: Known for its iridescent green chelicerae
• Segestria senoculata: A common species found across Europe, recognized by its distinctive patterns

Conservation

• Common in many habitats and generally not considered at risk
• Human activities, such as deforestation and urbanization, can impact their natural habitats

Significance to Humans

• Generally harmless to humans
• Can help control insect populations in their habitats
• Seldom seen due to their reclusive nature

Fun Facts

• Eyesight: Unlike most spiders with eight eyes, Segestriidae have only six.
• Web Structure: Their tubular webs can often be found in the crevices of old buildings.
• Coloration: Some species have strikingly iridescent green chelicerae, adding a dash of color to their otherwise drab appearance.
• Hunting Tactics: They do not leave their webs to hunt; instead, they wait for prey to come close enough to snatch.