Currently viewing the category: "Cobweb Spiders"
What's That Bug? does not endorse extermination

Subject: Australian Redback in Louisiana?
Location: Leesville, Louisiana
May 4, 2017 8:35 pm
I’ve found several of these spiders over the last two years. They have red markings on the back unlike black widows that have a red hour glass on the abdomen. I also noticed some white markings as well. Curious if this could be an Australian Redback???
This one was released back to the woods this evening. May the 4th be with him.
Signature: Thanks, Lee

Immature Black Widow

Dear Lee,
This is an immature female Black Widow Spider.  When she matures, she will lose the red and black markings on the upper surface of the abdomen.  She should still have the red hourglass marking on the ventral surface.  Your confusion regarding the Australian Redback Spider is understandable as they are in the same genus as the Black Widow.  P.S.  Is your town named for you?

What's That Bug? does not endorse extermination

Subject: Spider ID please
Location: Cochise County, Arizona
April 25, 2017 4:55 pm
Hello Bugman,
I found this spider in a space between a door and the screen. It is shiny and I first thought of black widow but it doesn’t have the red hourglass on the abdomen. What it can be? I appreciate your help so that I can open that door again.
Signature: Kana

Immature Western Black Widow

Dear Kana,
This is definitely an immature Widow, probably a Western Black Widow.  Here is a matching image from BugGuide.

Dear Daniel,
Thank you so much for your quick reply. I have never seen a black widow spider and wanted to know where they live (to avoid them). Never imagined they live so close!
Kana
What's That Bug? does not endorse extermination

Subject: What spider is this?
Location: Minnesota
April 13, 2016 6:06 pm
Hello I found this spider in a crawl space in Minnesota, what spider is this?
Signature: Fog lifted

Cobweb Spider

Cobweb Spider

Dear Fog lifted,
We believe this is one of the Cobweb Spiders in the family Theridiidae, a group well represented on BugGuide.

What's That Bug? does not endorse extermination

Subject: good or bad spider?
Location: southern indiana
November 15, 2015 12:42 pm
Southern Indiana. November 15. In the house.
Signature: Niki

Immature Northern Black Widow

Immature Northern Black Widow

Dear Niki,
We don’t really like to think of spiders as good or bad, but without waxing philosophically on the matter, we can tell you that this is an immature Northern Black Widow, and that the bite of a Black Widow Spider is considered to be potentially dangerous, especially to young children and the elderly.  According to BugGuide:  “Caution: This spider is venomous and can harm people. However, the female injects such a small dose of venom that it rarely causes death. Reports indicate human mortality at well less than 1% from black widow spider bites. While Latrodectus variolus is not aggressive and does not have the instinct to bite, her venom is neurotoxic, which means that it blocks the transmission of nervous impulses. If the spider bites, most likely it has been pressed against human bare skin, and this causes a natural reaction, a bite in self-defense. For the most part, the black widow’s bite may be felt only as a pin prick, during which the spider’s fangs inject a minute amount of highly toxic venom under the skin. The severity of the victim’s reaction depends on his or her age and health, and on the area of the body that is bitten. Local swelling and redness at the site may be followed in one to three hours by intense spasmodic pain, which can travel throughout the affected limbs and body, settling in the abdomen and back (intense abdominal cramping, described as similar to appendicitis), and can last 48 hours or longer. Elderly patients or young children run a higher risk of severe reactions, but it is rare for bites to result in death; only sixty-three having been reported in the United States between 1950 and 1959 (Miller, 1992). Other symptoms can include nausea and profuse perspiration. If left untreated, tremors, convulsions and unconsciousness may result. When death does occur, it is due to suffocation.”  There should be a telltale red hourglass mark on the ventral surface.

What's That Bug? does not endorse extermination

Subject: What Spider Is This
Location: South Africa
February 5, 2015 2:05 am
Hi There,
Hoping you are able to identify this spider? – Wanted to know it it is poisonous to humans as some one at work got bitten by it?
Signature: Spider

Possibly Immature Widow Spider

Possibly Immature Widow Spider

Dear Spider,
This looks to us like an immature Widow Spider in the genus
Latrodectus.  You can compare your individual to this image posted to iSpot.  Some species of Widow Spiders are considered venomous and potentially dangerous to humans who are bitten.

What's That Bug? does not endorse extermination

Subject: Whats that bug! Spider!
Location: Las Vegas, Nevada
September 13, 2014 6:22 pm
I found the super cool spider that I have never seen before in Southern Nevada! Could you help me identify it?
Signature: Thanks bunches! Victoria Rebholz

Immature Western Black Widow

Immature Western Black Widow

Hi Victoria,
This is an immature Western Black Widow,
Latrodectus hesperus, and you can compare your image to this image posted to BugGuide.  According to BugGuide:  “Caution: Anyone bitten by a western black widow spider should receive prompt and proper medical treatment. While the black widow is considered the most venomous spider in North America, death from a black widow spider bite is highly unlikely.  For the most part, the black widow’s bite may be felt only as a pin prick, during which the spider’s fangs inject a minute amount of highly toxic venom under the skin. The severity of the victim’s reaction depends on his or her age and health, and on the area of the body that is bitten. Local swelling and redness at the site may be followed in one to three hours by intense spasmodic pain, which can travel throughout the affected limbs and body, settling in the abdomen and back (intense abdominal cramping, described as similar to appendicitis), and can last 48 hours or longer. Elderly patients or young children run a higher risk of severe reactions, but it is rare for bites to result in death; only sixty-three having been reported in the United States between 1950 and 1959 (Miller, 1992). Other symptoms can include nausea and profuse perspiration. If left untreated, tremors, convulsions and unconsciousness may result. When death does occur, it is due to suffocation.

What's That Bug? does not endorse extermination