Olios Giganteus – Giant Crab Spider

Olios giganteus giant crab spider in California

Olios Giganteus, the giant crab spider, belongs to the family of Sparassidae spiders, which are commonly called huntsman spiders. As other crab spiders, they have curved legs which gives them a crab-like appearance. However, the giant crab spider can reach a leg span of up to 6 inches (15 cm) – making them much larger than the normally small crab spiders. The giant crab spider like a warm and dry climate and can be found in the Western and Southern United States.

Giant Crab Spider Description

The body and the legs of the giant crab spider is covered with small hairs. It is mostly a light brown while the color gets darker towards the end of the legs. The spider has a black marking on its back that looks somewhat like a stretched letter “Y”.

Giant Crab Spider
Can you see the “Y”-shape on its abdomen? This photo was sent to us by Barbara from Scottsdale, Arizona.

Giant crab spiders are very fast runners, climbers, and they can also jump to reach any target.


As mentioned above, the giant crab spider is one of the largest spiders found in the United States. Their bodies can reach a length of up to 0.8 inches (2 cm) and their total leg span can reach up to 6 inches (15 cm).

Olios giganteus giant crab spider in California
A giant crab spider showing its full leg span. Photo: Wikipedia


Huntsman spiders are, as their name suggests, hunters. They do not spin webs to catch their prey. They only use their abilities to wrap their eggs in egg sacs.


The giant crab spiders can be classified as a rather aggressive species. Especially female specimen with an egg sac react very protective for their offspring and often attack any potential threat. This can also be humans.

Due to the speed and the abilities to climb over any obstacle, it can be hard to shake off a giant crab spider once it walks on a human being. The spider may consider these attempts as hostile and go into attack mode.

The bite of a giant crab spider can be quite painful – more painful than most other spider bites and mostly more severe than a bee sting. The venom of the spider often causes some nausea, headaches and local swellings.

However, these symptoms usually wear off with a couple of hours and hospital treatment is usually not required.

Olios giganteus scientific classification

  • Kingdom: Animalia
  • Phylum: Arthropoda
  • Subphylum: Chelicerata
  • Class: Arachnida
  • Order: Araneae
  • Infraorder: Araneomorphae
  • Family: Sparassidae
  • Genus: Olios
  • Species: Olios giganteus

Giant Crab Spider Range in the US

Olios giganteus giant crab spider range

The giant crab spider can be found in the western and southern states of the US. Namely, these are: Washington, Oregon, California, Nevada, Arizona, New Mexico and Texas.

Olios Giganteus – Giant Crab Spider

24 thoughts on “Olios Giganteus – Giant Crab Spider

  1. Is this a crab spider? Male or female? It is living in my covered outdoor swing on my patio. The markings lead me to think it is a giant crab spider and it is very fast. I do not plan to kill it unless it is dangerous. We are elderly and I have several health issues, mainly diabetes.

  2. I found this in our back yard near Phoenix, AZ. Looks like a giant crab spider to me, but the body was more greenish than brown, like most photos seem to show.

  3. Found this spider under my camper when I was packing to leave. Southern part of New Mexico at Leaseburg State park NM. I was in a hurry to leave and used my phone with max zoom for the picture. My guess would be the body was about an inch

      1. I found this one coming out of an outdoor shower in Three Points, AZ (SW of Tucson). She caught my attention, that’s for sure!

  4. Spider found in Mesa, AZ. It was uniformly tan or light brown. Leg tip to leg tip about 2 inches. Not extremely active told it was soft and fuzzy feeling.
    Is it dangerous to people and pets.

  5. I found this spider under the cushions n my patio furniture in Tucson AZ. It was around 2 inches in size with body and legs.

  6. Super was in Mesa Az . Light tan in color about 2 inches leg to leg, fuzzy feeling. Not very active or fearful. Scooped up with sheet of paper and relocated to grass garden area. Did not see evidence of web on patio table near pool mid march.

  7. This is my pest control and bathroom buddy. I’m in and out all night so I get bugs in the house. His name is Steve. I wet down the shower. He spends just enough silk that he can get up and down the shower ball and not slip. I’ll leave the light on at night so the bugs will go in there instead of the bedroom. In the morning, when I need to shower, he heads for the vanity ceiling. I will send a picture of the beginning of his day and where he sleeps.

  8. This was under a pillow on the outdoor couch I sat on in Carefree AZ. Now I’m scared to sit on my patio. 😵‍💫😝

  9. I came outside to do the last check on the cats and go to bed. Found this guy waiting just outside the door. Not a fan of spiders and he is quite big! We live in Bandera, TX. His color is very light almost grey. I’m thinking a huntsman spider but is it a giant crab spider?

  10. Was trimming my Kalanchoe plant and was ready to grab next stem when I went…ooohhhhh. He or she matches some of the dried leaves perfectly. Thanks to your article feel confident it is a Giant Crab Spider. Spring day in Tucson AZ

  11. Found one hiding today while I was setting up the automatic sprinkler system for my mini garden. I am not a spider fan, but I wasn’t about to move it and it stayed crouched there as I worked, definitely watching me. I hope it enjoys the water it’ll have available, and the garden is a wonderful place for it to kill the bugs there. I’ll just remember to check before I grab things go… and I’m glad I didn’t look it up until I was done… the description here isn’t helpful to calm the anxiety.

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