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The Sack Spiders
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Jul 3, 2025
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Hi, Malcolm Walker again with Bug Facts.
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Today we re talking about a spider that
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s a nightmare for people who like to
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sleep with their mouths open. That's
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right, we're talking about sack spiders.
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And there's a few different species in
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this group that we were going to cover
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in this series. So, they're found all
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over the world except for Antarctica.
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But again, today we're just focusing on
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the southern sack spider. But today
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we're talking about one of the most
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common ones which is the southern sack
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spider also known as cheranththeium and
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clissum. They're also tan colored which
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helps them blend in with kind of the
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umber or the sienna tones of our walls
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and our floors and things like that. And
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those help them to sense vibrations and
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maybe even sense chemicals in the air.
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But you got to be really careful if
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you're trying to identify these guys. If
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you kill the spider, those hairs come
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off and it's really hard to get them to
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stick back on. So, if you can, you want
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to just observe these guys without
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killing them and then let them go on
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their merry way. So, it makes them
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really easy to hide. A lot of people
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mistake them for other house spiders,
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especially cobwebs. Cobwebs are a
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similar color and size. You might just
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be snacking on a nice little worm and it
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might not taste very good or you might
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just get a little bite that you don't
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expect. And although they do belong to
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the same order, they're not actually
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related super closely.
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They're in the same order, Arina.
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They're in the same class. They're in
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the same film, but they're not actually
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closely related. Now, these guys are in
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the family clubite. And in this family,
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you have about 2,000 species spread
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across six continents. If you happen to
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get bitten by a sac spider, you might
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notice some symptoms from the bite. It
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might be a little bit painful, and
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that's because their venom is cytotoxic.
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If you have any questions or comments,
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please put them below. We'd love to
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answer them for you. And if you have any
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suggestions for future videos, what bugs
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we should cover, what arachnids we
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should cover, anything like that, please
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let us know. We'll see you next time
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with another bug. So, it can actually
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destroy cells and cause lesions at the
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sight of the bite. So, if you get bitten
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by one of these, it might leave a lesion
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that's painful and it could even last
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for a couple of days. Now, thankfully,
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these are very, very rare. There's only
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been a handful of cases where somebody
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was severely affected by a sack spider
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bite. And it sounds like it's pretty
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rare even for them to get into your
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skin. They usually just kind of latch
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onto your skin and not actually inject
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any venom into you. But still, you might
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notice some pain or swelling or redness
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around the area of the bite. But it's
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not common for these to be
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life-threatening.
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So, if you do get bitten by one of these
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spiders, it's probably not going to be
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too serious, but it could be a little
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bit painful. As far as behavior goes,
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sack spiders aren't really aggressive.
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They're not going to seek you out, but
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they've been known to bite. Usually, it
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happens when they reined with you and
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you accidentally put your mouth open. Or
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you rewearing clothing made of natural
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fibers like cotton and the spider crawls
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up onto the fabric and then latches onto
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your skin. You feel that bite. It could
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be painful enough to wake you up, but
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most people just kind of brush it off
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and go back to sleep. And the spider
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will continue on its merry way. But
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yeah, they're not aggressive. They don't
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want to bite you. They read just kind of
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doing their thing and you happen to be
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in the wrong place at the wrong time. As
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far as appearance goes, these guys are
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pretty small. They're only about 3 mm in
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length. So, they're pretty tiny. And
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sack spiders are actually quite hairy.
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You look at them under the microscope
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and you can see that they have these
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little hairs all over their body. So,
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next time you're lying in bed, keep your
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mouth open. If you enjoyed this video,
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make sure to follow us here on YouTube
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for more bug videos like this
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