Identification
Measuring a mere 2.5 to 3.5 mm, *Archeolarca aalbui* is a master of the miniature. This pseudoscorpion possesses a distinctively flattened, pear-shaped body, typically clad in shades of polished mahogany and deep amber. To the naked eye, it looks like a tiny, tail-less scorpion. Look closely for its exceptionally long, slender pedipalps (pincers), which it holds out front like a seasoned boxer. Unlike common garden varieties, *A. aalbui* is distinguished by its specific tarsal segments and its preference for the deep, arid interior of woodrat middens.
Habitat & Range
This species is a specialist of the Mojave Desert’s "subterranean apartments." It is almost exclusively found within the sprawling, ancient stick-nests (middens) of woodrats (*Neotoma*) in California. These middens provide a stable, humid microclimate amidst the harsh, scorching desert. While rare to encounter, they are most prevalent in rocky outcrops and desert scrub where woodrats thrive.
Behaviour
To see an *A. aalbui* is to witness a tiny tank in motion. They are surprisingly agile, often scuttling backward or sideways with their oversized pincers held aloft. They are solitary hunters of the shadows. Interestingly, they often engage in "phoresy"—hitchhiking on the legs of larger beetles or even the woodrats themselves to disperse to new nests, a daring feat for a creature the size of a sesame seed.
Diet
They are the apex predators of the midden’s micro-fauna. Using sensory hairs on their pincers to detect vibrations, they ambush collembolans (springtails), mites, and tiny insect larvae. Once caught, they inject a paralyzing venom through their pincers to liquefy their prey's insides.
Fascinating Fact
Despite lacking a spider’s spinnerets, *Archeolarca aalbui* is a gifted weaver! It produces silk from glands in its jaws (chelicerae) to craft a tiny, waterproof "igloo" used for molting or protecting its eggs.