Home / Cheiracanthiidae / Yellow Sac (Cheiracanthium inclusum)

Yellow Sac (Cheiracanthium inclusum)

The yellow sac spider indigenous to Americas was initially a part of the Clubionidae and Miturgidae groups but at present belongs to the Eutichuridae family.

Scientific Classification

Yellow Sac Spider

Physical Description and Identification

Adults

Size: The females are 0.20 inches to 0.35 inches (5mm to 9 mm), while the males have a length of 0.15 inches to 0.31 inches (4mm to 8 mm).

Color: It has a pale yellow-beige body, while its palps, jaws and tip of the feet have markings of brown or black (which have earned it the name black-footed spider). There is also an orange brown stripe running through the top-centre part of its abdomen.

Yellow Sac Spider Size

Eggs

Females produce about two egg sacs in general that may even go up to five, with each sac containing approximately 30 to 50 eggs. Laid in small silk tubes, the eggs are small and round-shaped, covered in white silk, deposited at the bottom of the leaves or other foliage. The mother spider stays with the eggs and shields them against any predator.

Yellow Sac Spider Egg

Spiderlings

Approximately 40 spiderlings hatch from a single sac mostly in spring. The juvenile spiders remain the silken sac for a while after birth before being on their own completely. The mother spider stays with the spiderlings for approximately seventeen days, till they complete the first molt.

Yellow Sac Spiderling

The Web

The Yellow sac spider does not make webs, rather they build a sac or silken tube in protected places like beneath a leaf or at the meeting point of a ceiling and wall.

Yellow Sac Spider Web

Are Yellow Sac Spiders Poisonous and Do they Bite

The yellow sac spiders are venomous and their bites are said to contain cytotoxin, resulting in necrosis (cell injury where the cells in the living tissues die prematurely). However, this necrotic nature of the bite of this spider has been a subject of dispute. In fact, in one study conducted in Australia and the United States, it was seen that out of the 20 people bitten by this species, none of the bites had been of a necrotic nature.

There have also not been any reports of fatalities in humans from the bites of these spiders. Besides moderate pain, other common symptoms that the victim might suffer from include localized swelling and itching, while some could also encounter feelings of nausea and dizziness.

What does a Yellow Sac Spider Bite Look Like

The bite of these spiders look like a red welt and are often mistaken for that of a brown recluse, though the sting of the latter can be more painful and severe.

Black-Footed Yellow Sac Spider

Yellow Sac Spider Bite Treatment

Though the symptoms go away between seven and ten days, in case of severity a medical practitioner’s help needs to be sought. Some normal home remedies people mention include applying an ice pack and hydrogen peroxide on the affected area.

Quick Facts

Other names American yellow sac spider, Black-footed yellow sac spider, Northern Yellow sac spider
Lifespan Males: 1 year;
Females: 2 years or a little more
Distribution Parts of the New World (Northern, Southern and Central America as well as the West Indies)
Habitat Underground debris, forest floors, trees, fruit orchards as well as several manmade structures
Diet Their own eggs, other spiders bigger than their own size as well as a variety of insects
American Yellow Sac Spider

Did You Know

  • In 2011, March, and 2014, April, the famous automobile company Mazda recalled 65000 of the Mazda 6 cars since webs of this spider had clogged the fuel tank.
  • To get rid of the yellow sac spiders, you need use a vacuum to remove the silk sacs which may be spotted at the points where the wall meets the ceiling. Professional help can even be sought for this purpose.
Picture of a Yellow Sac Spider

Image Credits: Cdn.securesyte.com, Farm3.static.flickr.com, Forestryimages.org, Bugguide.net, Taeniatec.com, Creationwiki.org,
Farm5.staticflickr.com, Usaspiders.com

The yellow sac spider indigenous to Americas was initially a part of the Clubionidae and Miturgidae groups but at present belongs to the Eutichuridae family.

Yellow Sac Spider

Physical Description and Identification

Adults

Size: The females are 0.20 inches to 0.35 inches (5mm to 9 mm), while the males have a length of 0.15 inches to 0.31 inches (4mm to 8 mm).

Color: It has a pale yellow-beige body, while its palps, jaws and tip of the feet have markings of brown or black (which have earned it the name black-footed spider). There is also an orange brown stripe running through the top-centre part of its abdomen.

Yellow Sac Spider Size

Eggs

Females produce about two egg sacs in general that may even go up to five, with each sac containing approximately 30 to 50 eggs. Laid in small silk tubes, the eggs are small and round-shaped, covered in white silk, deposited at the bottom of the leaves or other foliage. The mother spider stays with the eggs and shields them against any predator.

Yellow Sac Spider Egg

Spiderlings

Approximately 40 spiderlings hatch from a single sac mostly in spring. The juvenile spiders remain the silken sac for a while after birth before being on their own completely. The mother spider stays with the spiderlings for approximately seventeen days, till they complete the first molt.

Yellow Sac Spiderling

The Web

The Yellow sac spider does not make webs, rather they build a sac or silken tube in protected places like beneath a leaf or at the meeting point of a ceiling and wall.

Yellow Sac Spider Web

Are Yellow Sac Spiders Poisonous and Do they Bite

The yellow sac spiders are venomous and their bites are said to contain cytotoxin, resulting in necrosis (cell injury where the cells in the living tissues die prematurely). However, this necrotic nature of the bite of this spider has been a subject of dispute. In fact, in one study conducted in Australia and the United States, it was seen that out of the 20 people bitten by this species, none of the bites had been of a necrotic nature.

There have also not been any reports of fatalities in humans from the bites of these spiders. Besides moderate pain, other common symptoms that the victim might suffer from include localized swelling and itching, while some could also encounter feelings of nausea and dizziness.

What does a Yellow Sac Spider Bite Look Like

The bite of these spiders look like a red welt and are often mistaken for that of a brown recluse, though the sting of the latter can be more painful and severe.

Black-Footed Yellow Sac Spider

Yellow Sac Spider Bite Treatment

Though the symptoms go away between seven and ten days, in case of severity a medical practitioner’s help needs to be sought. Some normal home remedies people mention include applying an ice pack and hydrogen peroxide on the affected area.

Quick Facts

Other names American yellow sac spider, Black-footed yellow sac spider, Northern Yellow sac spider
Lifespan Males: 1 year;
Females: 2 years or a little more
Distribution Parts of the New World (Northern, Southern and Central America as well as the West Indies)
Habitat Underground debris, forest floors, trees, fruit orchards as well as several manmade structures
Diet Their own eggs, other spiders bigger than their own size as well as a variety of insects
American Yellow Sac Spider

Did You Know

  • In 2011, March, and 2014, April, the famous automobile company Mazda recalled 65000 of the Mazda 6 cars since webs of this spider had clogged the fuel tank.
  • To get rid of the yellow sac spiders, you need use a vacuum to remove the silk sacs which may be spotted at the points where the wall meets the ceiling. Professional help can even be sought for this purpose.
Picture of a Yellow Sac Spider

Image Credits: Cdn.securesyte.com, Farm3.static.flickr.com, Forestryimages.org, Bugguide.net, Taeniatec.com, Creationwiki.org,
Farm5.staticflickr.com, Usaspiders.com

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