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Spider Photos -
Sac Spiders |
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Here's some photos of Sac
spiders.
Click here for a
report on a bite by a sac spider. Many thanks for
allowing us to use the photos sent in. All photos are copyright to their
owners and may not be reproduced without permission.
Please choose a
section.
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The venom of sac spiders
contains a cytotoxin—which means it kills cells—like the venom of a brown
recluse. Unlike brown recluse bites which can take 2-3 months to heal, most sac
spider bites heal much more quickly, although the reaction will vary greatly
from individual to individual. Typical symptoms of a sac spider bite include a
stinging sensation followed by redness and mild swelling. In a few cases, the
bite may blister and break, leaving a sore that can take several weeks to heal.
Sometimes the person will feel mildly ill. Sac spiders belong to the genus
Cheiracanthium and the family Clubionidae. They are quite small and easy to
overlook—about 1/4 - 3/8 inch long, with no conspicuous markings. The front legs
are longer than the other three pairs. Sac spiders are quite pale. A common
house species, the yellow sac spider is pale greenish, tan or straw coloured.
Other sac spiders are light brown. Sac spiders typically have darker mouthparts
and a faint dark stripe running lengthwise down the abdomen (photo right).
Normally, these are outdoor spiders, but sac spiders often invade structures.
Their numbers increase significantly in the fall when the weather turns cool and
their food supply disappears. If there are small insects available, sac spiders
can become established indoors. At night, sac spiders actively hunt their
prey—usually small insects. In search of prey, they run quickly waving their
forelegs before them. Indoors, they can be observed on walls and ceilings, but
drop to the floor to seek cover when disturbed. Sac spiders construct a silken
tube or sac in a protected area, such as within a leaf, under landscape timbers
or logs, or at the junction of a wall and ceiling, and they use this sac as
their daytime retreat. This is how the sac spider gets its name. These spiders
do not build webs. After mating, females lay 30 to 48 eggs and cover them in a
thin coat of loosely spun silk. The small, white, paper-like sacs are often
found in easily overlooked locations, along ceilings and corners, or behind
pictures and shelves. The female may guard these egg sacs and may produce
several egg masses during her lifetime. Inspect for sac spiders by looking for
sacs in upper corners of rooms, ceilings, behind pictures, on window moulding,
blinds or curtains. During the day, sac spiders may be inside these sacs so
vacuuming is an excellent method of control. Remove and discard vacuum cleaner
bags to prevent reinfestation.
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3 July, 2008:
This spider was crawling on the Bed last night. I would like to know what it is and if they are dangerous?
Thanks, Calvin
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30 June, 2008:
Hi Glen,
These are pictures of what may be a Yellow Sac Spider that was in our kitchen back in May. These things are turning up a lot, but that's not unusual. They appear every summer with no problems beyond a few family freak-outs. I'm the only member of my family that doesn't scream, jump, then attack when I see a spider. Feel free to use the pictures if you want.
--Damy
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10 May, 2008:
Hi Glen, I have a major infestation of this spider. I have removed
from my kitchen over 30 of them in the past week, by either removing
them and replacing them out doors .. well, that was at first when we
were being humane, then got freaked out and began vacuuming them up.
I've vacuumed at least 20 in the last 48 hours. Please let me know if
you have any insight for me on the type of spider and whether or not
they're dangerous and how to rid my home of them.
Sincerely, Sheila
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10 May, 2008:
Hi Glen, I think this may have been a Yellow Sac Spider. I know I've
already sent pictures of two different spiders that I thought were Sac
Spiders, but I'm pretty sure this is one. It looks very, very similar to
some of the Sac Spiders on your site. But I could be wrong. There is a
never-ending supply of spiders I can't ID around here. There are several I
can think of that I'm just waiting for an appearance from this summer. I
will certainly photograph them and send you the pics. Feel free to use the
pictures I've attached. --Damy
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10 May, 2008:
Hi Glen,
I think this may have been a Yellow Sac Spider that webbed down beside me
and started grooming itself while still dangling on a web. He finally
dropped down to the floor where I managed a few photos as he crawled
carefully around obstacles. I uploaded a video of this activity to Youtube:
http://www.youtube.com/watch?v=jIcwsSphExc. Attached are the best
pictures I snapped of him. Feel free to use them if you want. --Damy
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Click for
a larger view. |
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Reply:
Be careful, it looks like a yellow sac spider. I doubt that the little bites
would be from this spider though.
27 January, 2008
Hi guys. Thought maybe you
could identify this spider. I could probably get a better photo if I try a bit
harder. We have them in our house in Champaign, Illinois. My wife has had
little bites before and we wondered if they were spiders. Generally we like
them but wanted to be sure it was nothing to worry about. Thanks a bunch. Jesse Click for
a larger view.
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3 September,
2006:
Hi, Just been looking at the website and it is very
impressive. The pictures I have attached are of a spider found
in a bedroom in my house in Poland. Being British, I have never
seen anything like it before and wondered if you could identify
it for me and let me know if it is dangerous. Many thanks
Regards, Sharon
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Reply:
Be careful it looks like a yellow sac spider.
28 August, 2007:
Hello! I've loved your site for a long time, but hadn't been able to find it
for awhile. Thankfully I found it again! I've done well at not killing
spiders in and around my house the past year or two. I've learned how to
co-exist with them nicely(they eat the earwigs and the flies, which I HATE,
so the spiders are now my friends). My main question(to make a
long email longer) is about a spider I found in my bathtub last night. After
looking on your site, I'm thinking that it could be a Yellow Sac Spider, and
if it is, I feel awefully silly about not trying harder to get it out of my
house at least. Just wondering if you could take a look for me and let me
know what you think? And, if I see it again, what would be the best course
of action... I'm assuming removal from the house- which I was going to do
last night, but got creeped out by the darn thing and by the time I went
back to try and capture it, it was gone. I have 4 kids and 2 dogs, and
wouldn't want anyone getting too close and getting hurt by it if it is a
Yellow Sac Spider (or any other harmful spider). Any help would be Greatly
appreciated!
Heather, Colorado Springs, CO
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Reply:
Be careful it looks like a yellow sac spider.
8 July, 2006:
Hi, My kids found this spider in the house and asked me to take it's
picture. I thought it would be neat for them to find out what kind of
spider it was. If it helps, we live in western Michigan. Thank you in advance
for any help you can give us. Kim Click for
a larger view.
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13 June, 2006:
I live in Plymouth, MA and I seem to have a spider problem. I see at
least one of these a day in my house. Sometimes 2 or 3 per day. One
morning there were 3 all within a ten foot radius at once. Is it normal to
see this many? I have done some research online and would
just like to get some sort of confirmation. I believe they are sac
spiders? To be honest this scares me because I have also read that
they are the most common cause of spider bites in the US. They seem
to confine themselves to corners and where the walls meet the ceilings,
but have also been caught crawling across walls and
ceilings. They also fall towards the floor when disturbed. Are these
dangerous and should I be concerned? How can I minimize their
existence inside my house?
Thanks,
Kevin Olson, Plymouth, MA |
Reply: Yes, that is
a Cheiracanthium
species sac spider, which ARE medically significant. Nathan
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Reply: First one could be a yellow
sac spider:
http://www.srv.net/~dkv/hobospider/yellosac.html
and they can cause a painful bite. the next one is a daring jumping
spider and they aren't dangerous. Last one could be a steatoda of
some sort:
http://www.nicksspiders.com/nicksspiders/steatodabipunctata.htm |
30 May, 2006:
Good morning, I live near Burlington, Vermont, USA. Love the sight, though it gives me the willies like you wouldn't
believe.
I found three spiders recently, and would like to know if anyone
can help with identifying them. (Please feel free to eliminate any pics you feel are
extraneous.) Sorry about the quality of these two, it was full dark, and I
was releasing the next spider, when I saw this one. Sitting on a
2x6 board ... .5" - .75" longish
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Reply: The closest match I could
suggest is the yellow sac spider. Check
this page
to compare.
12
November, 2005:
Dear Glen, I have a little bit of a strange situation. It is going to
sound like a joke, but I promise it is not. I am in the Philippines and I have a
small baby monkey that was bitten by a spider. He was trying to catch it to eat
it and apparently the spider was not willing to go without a fight. It
definitely bit the monkey because the monkey rubbed his hand for several minutes
after the bite. I need your help in identifying the spider to know if there is
anything I can do or should do to minimize the effects of any venom that might
be involved. I really appreciate your help. Thank you, Robert Ross |
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Reply: Be careful with this one as
it resembles a yellow sac spider which can give a nasty bite.
Click here for more info.
23 October, 2005:
I found this spider above my fridge and I don't know what it
is? its about the size of a dime and very fast. please help.
Thanks, Josh. |
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Reply: That is
Cheiracanthium inclusum, the yellow sac spider, which is
medically
significant. - Nathan Hepworth
17 October, 2005:
PS. After seeing your site, I found the species of spider
that live all over our home. They appear to be sac spiders
(again, see photo), and it seems that maybe they aren't
necessarily the best candidates as roommates. |
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20
July, 2005:
Hi, is this spider a yellow sac spider? We live in
Philadelphia, Pa. Any help would be appreciated. Thanks, mike
Click for larger view. |
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Reply: This is a sac
spider, Cheiracanthium mildei. See this page:
http://www.bugguide.net/node/view/3366/bgpage Nathan Hepworth |
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23 June, 2005:
Ok I took some better pics little
boogers are hard to take pics of anyways maybe these will help I
live in Ottawa Canada maybe the region may help in determining
what type it is like I said I have never seen one like this before
Thanxs again!
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Reply: This picture has been posted
before, on this page:
http://www.spiderzrule.com/spiderphotos04.htm
And there is an ID , in red text, above the image. The spider
is Cheiracanthium inclusum, the yellow sac spider. Go to this
website for more info:
www.hobospider.org. A yahoo search on the scientific name should
give you some more pics and/or info.
- Nathan Hepworth. |
4 March, 2005:
Hi, my name is Sonia. I have attached a photo of the spider
that keep showing up in my basement. I'm just wondering if you can
tell me what kind they are and if they are dangerous. I'm concerned,
because I have a 1 1/2 year old daughter that had spotted the last
one and tried to pick it up. I searched up and down your website and
couldn't find anything that looked like this. It has a reddish clear
body.
Please Help!! |
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The broad face sac
spider, trachelas tranquillus, is often confused with
the woodlouse hunter, being similar in shape & colour. Its abdomen
is more sac shaped however
and is a light yellow/grey with a darker
marking on the
dorsal side.
Its cephalothorax is dark with enlarged chelicerae. Its
foremost legs are the darkest and get lighter towards the back legs
and th spider grows from 3 - 10mm. It is normally found Normally
found at the base of plants, in grasses and in ground debris. In the
United States is is found in New England and adjacent Canada south
to Georgia and Alabama and west to Kansas and Minnesota. This is a
hunting spider so it makes no web. However, it builds a sac like
tube to hid and rest in diurnally which is also used to protect its
eggs in autumn. This spider tends to forage on other dead arachnids
and insects which can cause its bite to be particularly unpleasant
due to infections. |
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15 July, 2007:
Hi, I was wondering if you could help identify this spider. We have
a cabin in the El Dorado forest near Lake Tahoe & these spiders
appear there a lot. We find them in the sinks & other areas around
the cabin. I have looked at pictures, but have not come across any
that look like it could be related to this spider. Thank you for any
help in you can provide me in figuring out what type of spider this
is.
Judy
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1
October, 2004:
We found this spider at our work on Martha's Vineyard Island,
Massachusetts. Please help us identify it! Thanks.
Kelley Debettencourt |
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