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Ray spider
Ray spider A common eastern ray spider (Theridiosoma gemmosum) hanging from a web in England.

ray spider

arachnid
Also known as: Theridiosomatidae
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Taxonomy

See also list of spiders

ray spider, (family Theridiosomatidae), any of a family of around 175 species of spiders known for their conelike webs and unusual hunting practices. Most ray spiders are less than 3 mm (0.125 inch) in body length and are usually found near streams or in damp areas. The strands of the ray spider’s web extend outward in raylike groups of three or four. The web is pulled into a cone shape by a strand attached from the web center to a nearby twig. This strand, held taut by the spider, is released when an insect becomes caught in the web; the web snaps back, further ensnaring the insect.

Ready to slingshot
Ready to slingshotA common eastern ray spider (Theridiosoma gemmosum) holding its conical web taut with a silken thread at the apex. The spider will release the web like a slingshot to ensnare prey.
The Editors of Encyclopaedia BritannicaThis article was most recently revised and updated by Melissa Petruzzello.