Wingless-insect
Guides
Allacrotelsa spinulata
silverfish
Allacrotelsa spinulata is a North American silverfish species in the family Lepismatidae. It belongs to the order Zygentoma, an ancient lineage of wingless insects. The species is relatively well-documented with over 800 iNaturalist observations. It is distinguished from other silverfish by specific morphological features including prominent spines on the caudal filaments.
Calx
Calx is a genus of springtails (Collembola) in the family Entomobryidae, first described by Kenneth Christiansen in 1958. The genus belongs to the subfamily Entomobryinae and tribe Entomobryini. Members of this genus are small, wingless hexapods with the characteristic furcula (springing organ) that defines the order. The genus has been recorded across multiple biogeographic regions including North America, the Caribbean, the Andes, and India.
Hypomachilodes texanus
Hypomachilodes texanus is a species of bristletail in the family Meinertellidae, first described by Silvestri in 1911. It belongs to the order Archaeognatha (also known as Microcoryphia), an ancient group of wingless insects with a fossil record extending back to the Devonian period. The species is known from North America, with records indicating presence in the region. Like other bristletails, it is a primitive hexapod with distinctive morphological features including large compound eyes that meet dorsally and the ability to spring-jump using its caudal appendages.
Petridiobius arcticus
Arctic Bristletail
Petridiobius arcticus is a species of jumping bristletail, an ancient lineage of wingless insects belonging to the order Archaeognatha. As a member of the family Machilidae, it represents one of the most primitive insect groups, retaining characteristics of early insect evolution. The species has a broad distribution spanning multiple continents, occurring in both the Palearctic and Nearctic regions. Despite its wide geographic range, detailed biological information remains limited.
Timema boharti
Bohart's timema
Timema boharti is a small walkingstick species in the family Timematidae, endemic to California. It inhabits xeric pinyon-juniper woodland with chaparral intrusions at elevations around 915 m. The species exhibits two distinct colour morphs—greyish and green—with assortative mating by colour phase. It is nocturnal and has been collected in late April, with both mating pairs and late-instar nymphs observed. Like other Timema species, it is wingless and feeds on host plants within its specialized habitat.
Trigoniophthalmus
Trigoniophthalmus is a genus of jumping bristletails in the family Machilidae, order Archaeognatha. The genus was erected by Verhoeff in 1910 and contains approximately 11-14 described species distributed across the Palaearctic region. Taxonomic revision in 2019 established two subgenera: Trigoniophthalmus s. str. and Silvestrius subgen. nov. Species within this genus are distinguished by morphological features of the compound eyes, ocelli, and ovipositor structure.
Trigoniophthalmus alternatus
Cave Bristletail
Trigoniophthalmus alternatus is a species of jumping bristletail, a primitive wingless insect in the order Archaeognatha. It is commonly known as the Cave Bristletail due to its association with subterranean and dark, moist habitats. The species has a broad distribution across Europe, Northern Asia (excluding China), and North America. It was originally described as Machilis alternatus by Silvestri in 1904 before being transferred to the genus Trigoniophthalmus.