Featherwing-beetles
Guides
Acrotrichinae
Acrotrichinae is a subfamily of featherwing beetles (Ptiliidae) first established by Reitter in 1909. Members of this subfamily include some of the smallest beetles known, with body lengths often under 1 mm. The subfamily contains the genus Phytotelmatrichis, which was discovered exclusively in phytotelmata of Zingiberales plants in southern Peru, suggesting specialized habitat associations within the group.
Cylindroselloides
Cylindroselloides is a genus of featherwing beetles (family Ptiliidae) established by Hall in 1999. It belongs to the tribe Nanosellini within the subfamily Ptiliinae. The genus is part of one of the most diverse families of Staphylinoidea, characterized by extremely small body size. As a recently described genus, it remains poorly known with limited published information available.
Motschulskium
Motschulskium is a genus of minute featherwing beetles in the family Ptiliidae, subfamily Nossidiinae. These beetles are among the smallest insects known, with most Ptiliidae measuring under 1 mm in length. The genus was established by Matthews in 1872 and is distinguished from related genera primarily by genitalic and antennal characteristics. Species within this genus are poorly known and rarely collected due to their minute size and cryptic habits.
Nanosella
Nanosella is a genus of featherwing beetles (family Ptiliidae) described by Motschulsky in 1869. Members of this genus are among the smallest known beetles, with body lengths often measuring less than 1 mm. The genus belongs to the tribe Nanosellini, which contains some of the most miniaturized insects in the world. These beetles inhabit decaying organic matter where they feed on fungal spores and hyphae.
Nephanes
Nephanes is a genus of minute beetles in the family Ptiliidae, established by C.G. Thomson in 1859. The genus contains at least two described species, including N. titan (Newman, 1834) and N. euphorbiicola Israelson, 1976. Members of this genus are among the smallest beetles known, characteristic of the featherwing beetle family.
Nossidium
Nossidium is a genus of minute featherwing beetles (family Ptiliidae) established by Erichson in 1845. It belongs to the subfamily Nossidiinae, one of the smaller lineages within this family of extremely small beetles. Members of this genus are among the smallest beetles known, with body lengths often below 1 mm. The genus has been documented from northern European localities.
Ptiliidae
Feather-winged Beetles, Featherwing Beetles
Ptiliidae is a family of extremely small beetles containing the smallest known free-living, non-parasitoid insects. Members range from 0.3 to 4.0 mm in length, with the smallest species, Scydosella musawasensis, measuring only 0.325 mm. The family has a cosmopolitan distribution and is characterized by distinctive narrow, feathery hindwings that give the group its common name. Their minute size imposes unusual biological constraints, including the production of very large eggs relative to adult body size.
Ptinella
Ptinella is a genus of minute featherwing beetles in the family Ptiliidae, characterized by extreme body miniaturization and reduced wing venation. The genus exhibits remarkable adaptive traits including wing polymorphism (presence of both winged and wingless morphs) and parthenogenesis in some species. These features appear to be evolutionary responses to the spatially and temporally heterogeneous subcortical habitat where members of this genus occur.
Staphylinoidea
Rove, Ant-like stone, and Carrion Beetles
Staphylinoidea is a large and diverse superfamily of beetles with worldwide distribution, encompassing approximately 58,000 described species across six families. Adults range from minute (Ptiliidae at 0.3 mm, the smallest non-parasitic insects) to moderately large (Staphylinidae up to 50 mm, Silphidae up to 45 mm). The superfamily is characterized by distinctive wing and abdominal morphology: hind wings lack accessory posterior ridges, medial loops, wedge cells, and apical hinges; the 8th abdominal segment is not fully invaginated within the 7th; and the head typically lacks a coronal suture. Larvae possess 3-segmented maxillary palps with distinct galea and lacinia, well-developed tergites and sternites, and annular or annular-biforous spiracles without epistomal lobes.