Bowl and Doily Weaver

Frontinella communis — the bowl and doily weaver — is one of about 4,500 species in family Linyphiidae (the SHEET-WEB WEAVERS — distinct from the more familiar orb-web weavers in family Araneidae). The species is widespread across all of eastern and central North America from southern Canada south through the eastern US to Texas, especially in woodland habitats. Females are 3-4 mm body length (much smaller than the more familiar orb-weaving spiders), with the species' diagnostic features: dark brown body marked by white markings along the abdomen sides, and small body size relative to the elaborate web architecture the species constructs. The species' major significance is the EXTRAORDINARY WEB ARCHITECTURE — one of the most elaborate spider web designs in NA. The bowl and doily web consists of TWO SEPARATE SHEET-WEB STRUCTURES: (1) The 'BOWL' — a concave inverted-dome structure of densely woven silk that hangs in the middle of the web; (2) The 'DOILY' — a flat horizontal sheet of silk that lies just below the bowl. The bowl and doily are connected by VERTICAL SILK THREADS. Above the bowl, additional vertical silk threads (called 'KNOCK-DOWN THREADS') extend up to nearby vegetation supports. The spider hangs UPSIDE-DOWN at the center of the bowl, with the dorsal surface up and the ventral surface down. Prey-capture mechanism: flying insects (small flies, gnats, mosquitoes, moths) flying through woodland vegetation strike the vertical knock-down threads above the bowl, lose flight stability, and fall down into the bowl-shaped structure. The spider, hanging upside-down at the center of the bowl, immediately seizes the prey from below through the silk and injects venom from above. The doily structure below the bowl provides PROTECTION from the spider's own predators (parasitoid wasps, larger spiders) attacking from below — predators must penetrate or navigate around the doily before reaching the spider. The bowl-and-doily architecture is unique among spider webs and is one of the most-cited examples of complex web evolution in spider biology. The species is widespread in NA woodland understory vegetation — webs are typically constructed in shrubs, low tree branches, or grassy vegetation 30-100 cm above the ground. The species is harmless to humans (no medically-significant venom, no aggressive behavior) and is one of the most-photographed sheet-web spiders in NA macro nature photography.