Apr 6
Today I found a spider I have never seen before…
Red-spotted Ant Mimic Sac Spider (Castianeira descripta), family Corinnidae, Conroe, TX, USA
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Today I found a spider I have never seen before…
Red-spotted Ant Mimic Sac Spider (Castianeira descripta), family Corinnidae, Conroe, TX, USA
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A female ant-mimic sac spider (Sphecotypus niger) prepares a cocoon in Bigal River Forest Reserve, Ecuador
by Arthur Anker
Orange ant-mimic sac spider (Castianeira amoena)?
Have you seen the orange ant-mimic sac spider (Castianeira amoena)?
I have now
Yes, in photos/videos
Yes, irl
I'm not sure
One of my favourite spiders, that I never get to see close up because they're so fast. This is a Spotted Ground Swift Spider, and even though she's missing a couple legs she was still living up to her name.
I was very lucky to get some decent photos, I dont know why this particular spider was so cooperative lol.
Spotted Ground Swift Spider, female (Nyssus coloripes).
Another sac spider I caught in the office and put outside; looks like genus Castianeira again.
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[VIDEO AND PHOTOS TAKEN: MAY 13TH, 2023 | Video and Image IDs: A video and two photos of an orange and black red-spotted ant mimic spider in the wet dirt, surrounded by green plants, as well as a comparatively large beige millipede and what appears to be the spider's small round web in the video and latter photo. In the video, the spider is standing on top of the web as the millipede crawls by, the spider touching the millipede a few times with its front legs as it watches it go, but otherwise not interacting much /End IDs.]
@rararazaquato submitted: found a little beast in the bathroom ([removed]). what is it? i'm assuming some sort of arachnid/spider because it has two body segments and eight leg joints (although it's missing two legs). but its mouth parts are so huge! who is this man...
(pssst if you could remove the location from the submission that'd be great but if not thats ok too)
Yes, it's definitely a spider. This is a male and those big things on the face are not mouthparts but rather pedipalps, which are used in reproduction. Females will have much smaller-looking pedipalps. Anyhoo this friend looks like Falconina gracilis, which as far as I know has no common name but it's in the family Corinnidae with the ground and ant-mimic sac spiders :)
Castianeira cf. longipalpa (Araneae: Corinnidae)
Ant-mimic sac spider
Araña de saco
30 of June 2023 — Maryland, USA
As their common name suggests, this friend belongs to a group of spiders that mimic ants for various reasons. While the resemblance is not as obvious in its appearance, their behavior of moving in short bursts of energy as well as tapping their front legs (in order to resemble antennae) clues us into their mimicry.
I absolutely adore the markings, I’ve always had a soft spot for monochromatic animals with bold contrast.
