February 8, 2007: Thousands of daddy-long-leggers

[LabRat]

Daddy-Long-Legs
HYG-2060B-04
Susan C. Jones, Ph.D.
Assistant Professor of Entomology
Extension Specialist, Household & Structural Pests


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Daddy-long-legs, also known as harvestmen, are very commonly confused with spiders due to their general appearance and eight legs. However, these tan to brown creatures belong to the order Opiliones and are not spiders, all of which belong to the order Araneae. Although they are close relatives of spiders, daddy-long-legs do not bite humans, and they are not poisonous (they lack venom glands). They do not construct webs.


Class: Arachnida
Order: Opiliones
Common name: Daddy-long-legs or harvestmen Identification
Daddy-long-legs have eight very long, slender legs, although some species have shorter legs. They have an oval, compact, small body (1/16 to 1/2 inch long) that is held well above the ground by the thread-like long legs. Their body appears to be a single unit because the cephalothorax (combined head and thorax) and abdomen are broadly joined (no narrow waist), whereas spiders have a constriction between the cephalothorax and abdomen. Daddy-long-legs should not be confused with cellar spiders, which are found in cobwebs in dark, damp basements, cellars, and crawl spaces. Although cellar spiders have long legs, their body has a constricted waist (see HYG-2060).