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@nev.flipping.rocks.ap.brid.gy Oct 7, 2026, 11:59 AM

#Arachtober 7: back in April I found a whole bunch of mesostigs just chilling with a rove beetle under a log.

Probably Parasitidae or something like that. Contrary to their name these mites are mostly soil-dwelling predators, like the ones in these photos. I […]

[Original post on flipping.rocks]

About ten oblong or oval golden-brown mites, as well as a larger glossy dark brown elongated-teardrop-shaped critter with very short golden-brown elytra, on the grimy underside of a log.

Close-up with one of the mites almost in focus, showing its longer, thin, antenna-like first pair of legs and its short, curved, almost claw-like second pair of legs. The smooth dorsal shield seems undivided.

Another group of mites near the first one; no doubt a nymphal stage. They are rounded and simpler-looking, with legs peeking out from underneath.

@rickmartin.bsky.social Oct 7, 2026, 11:38 AM

A cross orb-weaver spider on its web 🌱🕸

#WildWebsWednesday #Arachtober #Spiders #BugSky #Nature #Wildlife #EastCoastKin

@bugeric.bsky.social Oct 7, 2026, 3:53 AM

Apologies, yesterday’s wall spider was for #Arachtober 5th. Today, the 6th, features a female Western Black Widow guarding her egg sac in her silken tunnel retreat. Cottonwood Picnic Area, Cimarron National Grassland near Elkhart, Kansas, USA. #bugsky #bugwatching #spider

Round, jet black spider with beige egg sac inside silken tunnel retreat on outside of bathroom building.

@arachtober.bsky.social Oct 7, 2026, 2:02 AM

This is one of my recent favorites, a Crescent-eyed Spider in this genus, Selenops. The family is called ‘Flatties,’ and you can see why, they are extremely flat spiders. Their flat shape lets them squeeze under bark or hide perfectly against a wall.

#Arachtober #spider #macro #macrophotography

@jtkindt.bsky.social Oct 7, 2026, 12:52 AM

Fishing spider (Dolomedes tenebrosus, per #iNat) that appears to have regrown its right front leg. Black Rock Forest, 7/26.

#arachtober #bugsky #bugshot #inverts

Brown spider with long legs splayed out on mottled gray rock. Front right leg is shorter, redder, and less hairy than front left leg.

@nev.flipping.rocks.ap.brid.gy Oct 6, 2026, 7:51 PM

#Arachtober 6: a small running crab spider (_Philodromus_) releases a thread of silk on the wind, preparing to "balloon". Sometimes they do this to travel far distances, other times simply to cross a gap. Orbweavers can use this to lay down web frameworks […]

[Original post on flipping.rocks]

A small flattish brown spider perched on the plank of a picnic bench with its abdomen slightly raised. A fine, straight thread of silk can be seen coming from the spinnerets at the end of its abdomen.

@g-lau.bsky.social Oct 6, 2026, 7:24 PM

"Nice catch"
An appropriately spooky silhouette of a #Spider and its prey, for both #Arachtober and #Halloween!
Actual colors, minimal editing.
#Arachnids #Arthropods #Invertebrates #SciArt #Macrophotography

Photo of a small spider in silhouette against blue sky. The spider has caught a prey in its web and is in the process of "mummifying" it. Watermark identifying photographer as Geneviève Laurin.

@rickmartin.bsky.social Oct 6, 2026, 5:14 PM

A common candy-striped spider 🌱

#arachtober #spiders #arachnids #wildlife #nature

@suzannevtw.bsky.social Oct 6, 2026, 3:17 PM

A little garden helper! #Arachtober #Spider #AOFoto #Fall #VT #ECK #Photography

A pale yellow spider pauses on a rusty piece of edging in a garden.

@spidermax3000.bsky.social Oct 6, 2026, 3:13 PM

#arachtober
Spotted #orbweaver - Neoscona sp.
(Shot near Cincinnati 9-20-23) 🕸️🕷️ #photography #macrophotography #wildlifephotography #wildlife #nature #animal #invertebrate #spidersky #ento #arachnid #spider

A spotted orbweaver (Neoscona sp.) working on their web as we look at their dorsal side where they are pulling new silk out of their abdomen.

@rockinbones.bsky.social Oct 6, 2026, 3:09 PM

#Arachtober #Spider #Inverts 🕷️
Caption this .

@jencmars.bsky.social Oct 6, 2026, 2:30 PM

One time I got curious about a dried up gall, saw it had an exit hole so was likely empty, and wanted to know what the inside looked like. But... it turned out someone else had moved in

Apologies to this little Tutelina, I hope you found a new house to your liking

#Arachtober

Photo of a round woody dried up gall on stick with a small hole in one side. It's cracked on top and showing a lot of wear

Photo of a tiny gray jumping spider inside a webbed woody hole, which is actually the interior of the gall from the previous photo

Photo of the same spider perched on top of the broken gall shell

Now the spider is perched on a finger, but the finger is enormous like the size of a whale compared to the teeny spider

@crawlieswithcri.bsky.social Oct 6, 2026, 1:38 PM

#Arachtober Day 6

Ms. Mecaphesa crab spider looking seasonally elegant.

#inverts #becurious

macro photo of a mecaphesa crab spider upside down in a dew covered, bright orange marigold.

@cornjob.bsky.social Oct 6, 2026, 12:42 PM

The maternal side of a female Rabid Wolf Spider (Lycosa rabida) as she totes her babies around for #Arachtober.

Rabid Wolf Spider (Lycosa rabida) female carrying her young on her abdomen.

@nev.flipping.rocks.ap.brid.gy Oct 6, 2026, 5:50 AM

Slightly belated #Arachtober 5: for #MiteMonday, here's my favourite mite find of the year. Back in March, found a whole bunch of Erythracaridae racing around on pine trees.

These speedy predatory mites used to be part of Anystidae but were split off into […]

[Original post on flipping.rocks]

A small reddish-orange mite with longish translucent legs that have faint red-orange banding and lots of spiky hairs sticking out exactly perpendicular to the leg. It also has two dark red eyespots. It looks very similar to a whirligig mite if you stretched it out a bit and added lots more leg hair.

@bugeric.bsky.social Oct 6, 2026, 4:46 AM

My #Arachtober 4th spider is from yesterday at the Arizona-Sonora Desert Museum, west of Tucson, Arizona, USA. Wall spiders, family Oecobiidae, are very small, even as adults. #bugsky #bugwatching #spiders #arachnids

Very small, mottled spider with relatively short, banded legs, clinging to a stucco wall on the exterior of a building.