Sphodros rufipes

Males readily identified by bright red-orange legs contrasting with darker body; females require examination of epigynum structure for definitive identification. Distinguished from congeneric species and Atypus by genital morphology: Sphodros males possess long curved embolus in matching conductor, while females display epigynum with four long coiled tubes. Size dimorphism pronounced with females substantially larger than males.

Associated with wooded environments where suitable structures exist for web construction. Constructs silk tunnels against tree trunks, rocks, or other vertical surfaces. Specific microhabitat requirements poorly documented but appears to favor forested or semi-forested settings with adequate vertical substrates.

Eastern and southern United States with confirmed records in Indiana, Missouri, New Jersey, West Virginia, Tennessee, Delaware, Louisiana, and Massachusetts (Tuckernuck Island). Photographed as far north as Minnesota. Documented in Canada with recent sightings confirming northern range extension. Westernmost confirmed record in Kansas.

Carnivorous; preys on insects and other arthropods that contact or land on the silk tunnel. Specific prey taxa not documented in available sources.

Developmental period extended; offspring require upwards of one year to fully mature and disperse from maternal webs. Females documented living up to 7 years. Males abandon webs to seek females for mating; females remain in webs, building nests in preparation for oviposition and egg protection.

Constructs distinctive silk tunnel (purseweb) against vertical surfaces such as tree trunks or rocks. Tunnel serves dual function as retreat and prey capture device. Spider waits within tunnel, detects prey contacting outer silk surface, then bites through silk to seize prey and pull it inside. Adults rarely leave webs except for mating. Males depart webs to search for females; females remain sedentary, maintaining and expanding webs.

Predator of small arthropods; specific ecological impacts unstudied. Serves as prey for various vertebrate and invertebrate predators. Web structure may provide microhabitat for associated organisms, though this has not been investigated.

Occasional subject of natural history observation and photography. Not medically significant; fangs oriented for downward strike rather than pincer-like action, with no documented serious bites to humans. May be encountered by hikers or naturalists in suitable forested habitats.

• Atypus speciesFormerly classified in same genus; distinguished by genital morphology—Sphodros males have long curved embolus in similarly shaped conductor, females have epigynum with four long coiled tubes versus different structure in Atypus. Also differs in web construction details and habitat preferences.
• Other Sphodros speciesCongeneric species distinguished primarily by male genitalia structure and geographic distribution; detailed examination required for identification.

• mygalomorph
• purseweb spider
• sexual dimorphism
• long-lived
• sedentary predator

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Vanquished vanishing columbines: Columbine sawfly, Pristiphora rufipes — Bug of the Week
• Cicindelidae | Beetles In The Bush | Page 7
• Fungus Manipulates Ants to Die Near their Nests, Ensuring New Hosts
• Bug Eric: More Beetles from Bones
• Working with Cerceris fumipennis—Part 2 | Beetles In The Bush
• Red-eyed poop! | Beetles In The Bush