Clubiona – Leaf-Curling Sac Spider

Spiders of the genus Clubiona, commonly called leaf-curling sac spiders, can be found throughout the world and in every US state.

Clubiona Description

Clubiona spiders usually have light-brown legs and cephalothorax and a slightly darker abdomen. Their legs and head may even appear transparent at times due to the light color.

Clubiona - Leaf-Curling Sac Spider
Photography by: Ken Mirman – Machiasport, Maine


As with any sac spider, the bite of a leaf-curling sac spider may cause some minor pain but is not dangerous for humans or larger pets.

Leaf-Curline Sac Spider Scientific Classification

  • Kingdom: Animalia
  • Phylum: Arthropoda
  • Subphylum: Chelicerata
  • Class: Arachnida
  • Order: Araneae
  • Infraorder: Araneomorphae
  • Family: Clubionidae
  • Genus: Clubiona

Distribution of clubiona spiders in the USA

Clubiona spider leaf-curling sac spider range USA

Various species of the clubiona genus can be found in every US state – Alabama, Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, Florida, Georgia, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, Wyoming

Clubiona – Leaf-Curling Sac Spider

9 thoughts on “Clubiona – Leaf-Curling Sac Spider

  1. Hello John, thanks for getting in touch! I am not 100 % sure about the ID of this spider. It’s definitely not one of the few medically significant spiders found in your area. Our best guess is that this is a leaf-curling sac spider, Clubiona sp. Here is more information about them:
    Here is an image of a similar looking specimen in that genus (Clubiona riparia):
    Let us know if you think that it was not this spider. If you have another picture showing the eyes of cephalothorax, that might help too. Cheers!

  2. White/ Ever so slight shade of blue/green color. Body is somewhat smaller than or same size as a nickel. Large and round. No protrusions from the back of the body. Typical oval type of web, long singular strand webs attaching to trash can and fence.

  3. I found this spider in a wall inside the house and have seen it in the garden also in Ontario CA. It has a brown color with a darker reddish brown thorax. The leg span is around 0.5 inches.

  4. Boulder, Colorado, November, 2021, inside, on a window ledge. So far has resisted 2 runs through your identification algorithm. First time I have taken a picture that so clearly showed all 8 eyes, incidentally, tho it appears to have something in its eye, so to speak.

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