Neotridactylus apicialis

The combination of minute size (under 10 mm), enormously enlarged hind femora that conceal the wings, reduced leathery forewings, and habitat along sandy freshwater margins distinguishes this species from all other North American orthopterans. The only other North American tridactylid, Ellipes minuta, is smaller and has different wing proportions. True mole crickets (Gryllotalpidae) have fossorial forelegs modified for digging, which pygmy mole crickets lack.

Adults are minute, ranging 5.5–10 mm in length—approximately the size of a grain of rice. The hind legs are enormously developed relative to body size, with the hind femora typically concealing the folded wings when at rest. Forewings are leathery, reduced to short stubs. Hind wings are membranous, pleated, and extend slightly beyond the abdomen when folded. Body form is compact and somewhat cylindrical, adapted for burrowing in loose substrates.

Sandy or silty margins of streams, rivers, ponds, and lakes. The substrate must be sufficiently loose to permit burrowing. Observed in riparian zones with exposed sandbars and streamside boulders.

North America: extreme southern Ontario east to Massachusetts, south to Florida, and west to southern California. Also recorded in South America: Colombia, Ecuador, and Guatemala.

Active adults have been observed in December in Arizona, suggesting year-round activity in warmer regions. Seasonal patterns in temperate portions of the range are poorly documented.

Ingests sand particles together with algae and other organic matter adhering to them. Specific algal taxa or other dietary components have not been identified.

Females construct subterranean burrows extending 2–3 cm below the surface, with brood chambers created at the bottom of tunnels. Developmental stages and duration are undocumented.

Primarily fossorial, tunneling beneath sand along water margins. Moves slowly when undisturbed on the surface. When disturbed, executes powerful jumps that enable rapid escape; the physics of these jumps involve remarkable acceleration. Tolerates close approach when not threatened. Burrows are shallow and temporary structures.

Functions as a primary consumer in riparian ecosystems, processing algae and organic detritus in sandy substrates. Serves as prey for various predators, though specific predator relationships are undocumented. Contributes to nutrient cycling in the ecotone between aquatic and terrestrial habitats.

No documented economic importance. Occasionally encountered by naturalists and photographers due to its unusual morphology and jumping ability. The species cited in biomechanical research on insect jumping performance.

• Ellipes minutaThe only other North American tridactylid; smaller in size with different wing proportions.
• Gryllotalpidae (true mole crickets)Superficially similar common name and fossorial habit, but possess modified fossorial forelegs for digging and belong to a different superfamily; pygmy mole crickets lack digging forelegs and jump instead.

Despite the common name 'pygmy mole cricket,' this species and its relatives are not closely related to true mole crickets (family Gryllotalpidae). The name reflects convergent burrowing habits rather than phylogenetic affinity. They are more closely related to short-horned grasshoppers (Acrididae).

• fossorial
• riparian
• jumping
• minute
• sand-dwelling

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• Catalogue of Life
• Bug Eric: Pygmy Mole Crickets
• Bug Eric: December 2010