Ammopelmatus kelsoensis

Kelso Jerusalem Cricket

Family: Stenopelmatidae · Class: Insecta · Order: Orthoptera

Conservation status: G1G2 S1S2

The Kelso Jerusalem cricket is a flightless orthopteran insect endemic to the Kelso Dunes area of California's Mojave Desert. Like other Jerusalem crickets, this species possesses a large, rounded head with powerful mandibles, a robust amber-colored body, and strong legs adapted for burrowing. The body is segmented with a shiny, somewhat translucent appearance typical of the genus Ammopelmatus. Adults measure approximately 25-50 mm in length, though specific morphometric data for this species remains limited in the scientific literature. Ammopelmatus kelsoensis occurs exclusively in the Kelso Dunes system within the Mojave Desert of San Bernardino County, California (BugGuide). This extremely restricted range makes it one of the most geographically limited Jerusalem cricket species. The Kelso Dunes represent a unique habitat within the broader Mojave Desert ecosystem, characterized by active sand dune formations that create specialized microhabitats. This species inhabits the sandy substrate of the Kelso Dunes, where loose sand provides ideal conditions for its fossorial lifestyle. The dune environment creates temperature and moisture gradients that likely influence the cricket's distribution and behavior within this restricted habitat. The active nature of the dunes, with shifting sands and varying vegetation cover, creates a dynamic ecosystem to which this species has specifically adapted. As a member of the Jerusalem cricket family, A. kelsoensis is presumed to be omnivorous, feeding on organic matter including plant material, small insects, and detritus found within the sand substrate. The species likely exhibits the nocturnal, burrowing behavior characteristic of Jerusalem crickets, emerging at night to forage and remaining underground during daylight hours to avoid temperature extremes and predation. Specific details regarding reproductive biology, seasonal activity patterns, and life cycle duration have not been well documented for this species. The Kelso Jerusalem cricket carries a global rank of G1G2, indicating it is critically imperiled to imperiled, and a state rank of S1S2 in California, reflecting its extremely limited distribution and small population size. The species currently lacks federal listing status. The primary conservation concern stems from its highly restricted range within a single dune system, making the entire species vulnerable to habitat disturbance, climate change effects, or recreational activities that might alter the dune environment. The Kelso Dunes' location within the Mojave National Preserve provides some habitat protection, but the species' extreme endemism places it at considerable risk. Climate change poses particular concerns, as altered precipitation patterns and temperature regimes could significantly impact the specialized dune ecosystem upon which this species depends. Scientific documentation for this species remains extremely limited. The information presented here synthesizes available observations from taxonomic databases and community reports. We welcome contributions of verified scientific data, photographs, or field observations to enhance this species account.

Data from The California Species Project — 14,000+ California species with verified data from CNPS, CDFW, USFWS, and more.