Clown-beetles
Guides
Abraeini
Abraeini is a tribe of minute clown beetles within the family Histeridae, first described by MacLeay in 1819. Members of this tribe are among the smallest histerid beetles and are characterized by reduced elytra that expose several abdominal segments. They are primarily associated with decaying organic matter and have been observed in various microhabitats including dung, carrion, and fungal fruiting bodies. The tribe contains multiple genera, though species-level taxonomy remains incompletely resolved for many groups.
Anapleus
clown beetles
Anapleus is a genus of clown beetles in the family Histeridae, comprising approximately 16 described extant species. The genus was first described by Horn in 1873 and has been documented from the mid-Cretaceous period (ca. 99 Ma) through fossil specimens in Kachin amber, indicating an ancient origin. Extant species are distributed across Europe, Asia, North America, and Central America. The genus is characterized by an ovate body form, which has been hypothesized to represent a basal lineage within Histeridae.
Bacanius
clown beetles
Bacanius is a genus of clown beetles in the family Histeridae, established by John Lawrence LeConte in 1853. The genus contains more than 70 described species distributed across multiple continents. Members of this genus share the compact, rounded body form characteristic of histerid beetles.
Baconia
Baconia is a genus of clown beetles (family Histeridae) comprising 116 species, with 85 species described in a 2013 systematic revision. The genus is renowned for brilliant jewel-like coloration and bizarrely flattened body forms—traits rare and little-appreciated in the Histeridae. Species are primarily distributed across North and South America. Many species are known from extremely few specimens; nearly half are represented by only one or two specimens in museum collections.
Caerosternus
Caerosternus is a small genus of clown beetles in the family Histeridae, established by J.L. LeConte in 1852. The genus contains a single described species, Caerosternus americanus. As a member of Histeridae, it belongs to the group of beetles commonly known as clown beetles or hister beetles.
Dendrophilinae
clown beetles
Dendrophilinae is a subfamily of clown beetles (family Histeridae) established by Reitter in 1909. It comprises more than 30 genera and approximately 490 described species. Members of this subfamily share the compact, convex body form characteristic of Histeridae but are distinguished by specific morphological traits and ecological associations.
Epierus
clown beetles
Epierus is a genus of clown beetles in the family Histeridae, established by Erichson in 1834. The genus contains more than 50 described species. Members of this genus are classified within the subfamily Tribalinae. Like other histerid beetles, they are likely associated with decomposing organic matter, though specific ecological details for the genus remain poorly documented.
Euspilotus
clown beetles
Euspilotus is a genus of clown beetles (family Histeridae) containing more than 80 described species. Members of this genus are predatory beetles, with some species documented as predators of forensic importance at decomposition sites. The genus was established by Lewis in 1907 and is classified within the subfamily Saprininae.
Exosternini
clown beetles
Exosternini is a tribe of clown beetles (family Histeridae) containing at least 60 genera and approximately 800 described species. Members are predominantly small, predatory beetles with diverse body forms ranging from compact and rounded to bizarrely flattened. The tribe includes notable genera such as Baconia, known for brilliant metallic coloration, and Operclipygus, characterized by clamshell-like pygidia. Many species remain poorly known due to extreme rarity and tropical distribution.
Geomysaprinus
clown beetles
Geomysaprinus is a genus of clown beetles in the family Histeridae, established by Ross in 1940. The genus contains at least 20 described species, distributed primarily in North America. Members are small, compact beetles typical of the Saprininae subfamily. The genus name reflects an association with Geomyidae (pocket gophers), suggesting possible commensal or symbiotic relationships with mammal burrows.
Haeteriinae
Haeteriinae is a subfamily of clown beetles (Histeridae) comprising over 110 genera and 330 described species. Members are obligate myrmecophiles and termitophiles, specialized as social symbionts that infiltrate ant and termite colonies. The subfamily exhibits dramatic behavioral and chemical adaptations for colony integration, including mouth-to-mouth feeding with host workers, grooming behaviors, and chemical mimicry of host scents. A 99-million-year-old fossil from Burmese amber demonstrates that this symbiotic relationship originated in the Cretaceous period, contemporaneous with the earliest-known ants.
Halacritus
Halacritus is a genus of clown beetles (family Histeridae) established in 1893. The genus contains more than 20 described species. Members of this genus belong to the subfamily Abraeinae and tribe Acritini. These beetles are part of the diverse histerid fauna, though specific ecological details for the genus remain poorly documented.
Hippeutister
clown beetles
Hippeutister is a genus of clown beetles (family Histeridae) containing six described species. The genus was established by Reichensperger in 1935 and is classified within the subfamily Haeteriinae. Species in this genus are found in North and South America, with two species (H. californicus and H. solisi) described from California in 2008. Members of this genus, like other Haeteriinae, are likely associated with social insects.
Hister
Clown Beetles
Hister is a genus of clown beetles in the family Histeridae, comprising small to medium-sized predatory beetles with distinctive compact, oval bodies and clubbed antennae. Members of this genus are typically shiny black or metallic in coloration and are found in diverse habitats worldwide. The genus is taxonomically significant as the type genus of the family Histeridae, with species identification relying heavily on elytral striae patterns and male genitalia characteristics. Some species exhibit morphological variability in dorsal elytral striae configuration, which has been documented in detail for H. shanghaicus.
Hololeptini
clown beetles
Hololeptini is a tribe of clown beetles (family Histeridae) comprising approximately 6 genera and more than 130 described species. Members are characterized by their compact, often flattened body form and association with decomposing organic matter. The tribe includes the genus Hololepta, which contains some of the largest histerid beetles. Hololeptini was established by Hope in 1840.
Hypocacculus
clown beetles
Hypocacculus is a genus of clown beetles (family Histeridae) established by Bickhardt in 1914. The genus contains more than 20 described species and is classified within the subfamily Saprininae. These beetles are part of the diverse Histeridae family, which are known for their association with decomposing organic matter.
Hypocaccus
clown beetles
Hypocaccus is a genus of clown beetles (family Histeridae) established by C.G. Thomson in 1867. The genus comprises more than 120 described species distributed across multiple continents. Taxonomic classification within the genus remains problematic, with several subgenera recognized but inter-relationships and diagnostic characters still under study. Species exhibit considerable morphological diversity, with some individuals showing atypical combinations of characters that complicate subgeneric assignment.
Hypocaccus propensus group
The Hypocaccus propensus group comprises a cluster of closely related species within the clown beetle family Histeridae. These small beetles are associated with decaying organic matter and are primarily distinguished by subtle differences in male genitalia and punctation patterns on the elytra. The group is taxonomically significant as it represents a challenging complex for identification, requiring dissection for definitive species determination.
Idolia
clown beetles
Idolia is a genus of clown beetles (family Histeridae) comprising six described species, all described by Lewis between 1885 and 1888 except I. laevissima, which was described by LeConte in 1852. The genus belongs to the subfamily Tribalinae and is characterized by features typical of histerid beetles, though specific diagnostic traits for the genus are not well documented in available sources. Species are distributed across North America.
Merohister
clown beetles
Merohister is a genus of clown beetles in the family Histeridae, established by Reitter in 1909. The genus contains approximately eight described species distributed across Europe and Asia. One species, Merohister ariasi, has been the subject of detailed biological study including descriptions of its larval and nymphal stages. Members of this genus are part of the diverse Histeridae family, which are generally associated with decomposing organic matter.
Neopachylopus
clown beetles
Neopachylopus is a genus of clown beetles in the family Histeridae, established by Reichardt in 1926. The genus contains six described species distributed across multiple continents. Species in this genus are part of the diverse saprinine lineage of histerid beetles, which are generally associated with decomposing organic matter.
Omalodes
clown beetles
Omalodes is a genus of clown beetles in the family Histeridae, comprising approximately 63-68 described species distributed across three subgenera. It represents the largest genus within the tribe Omalodini and has an exclusively Neotropical distribution, with some species extending into the southern United States. One species, Omalodes (Omalodes) fassli, has been reported on banana crops in Colombia where it may play a role in controlling the banana weevil. The genus is characterized by morphological features including complete apical stria on the elytra in some subgenera.
Omalodini
clown beetles
Omalodini is a tribe of clown beetles (family Histeridae) comprising at least two genera and more than 60 described species. The tribe was redefined in 2015 to include only the genera Ebonius and Omalodes. Members are distributed across Latin America with some species extending into the southern United States. Available ecological data are limited to a few species in the genus Scapomegas, which are associated with carrion and decomposing organic matter in forest biomes.
Paromalini
clown beetles
Paromalini is a tribe of small to medium-sized clown beetles within the family Histeridae, containing at least 270 described species across 13 genera. Members are characterized by their compact, oval bodies and clubbed antennae typical of histerid beetles. The tribe includes economically significant species such as Carcinops pumilio, which has been studied for its role in biological control.
Peploglyptus
clown beetles
Peploglyptus is a genus of clown beetles in the family Histeridae, established by J. L. LeConte in 1880. The genus contains three described species: P. belfragei, P. golbachi, and P. mulu. As members of the Onthophilinae subfamily, these beetles share the compact, rounded body form typical of histerid beetles. The genus is rarely encountered, with minimal observational records.
Phelister
clown beetles
A large genus of clown beetles (Histeridae) comprising over 90 described species. Members of the genus occupy diverse habitats including carrion, dung, and vertebrate nests. The P. panamensis species group is distinguished by unique hooks on the apex of the male 8th sternite.
Pinaxister
clown beetles
Pinaxister is a genus of clown beetles in the family Histeridae, established by Reichensperger in 1939. The genus contains four described species distributed in North America: P. decipiens, P. henricischmidti, P. peninsularis, and P. setiger. Members of this genus belong to the subfamily Haeteriinae, a group known for their associations with social insects.
Platylomalus
clown beetles
Platylomalus is a genus of clown beetles (family Histeridae) comprising at least 60 described species. The genus was established by Cooman in 1948 and belongs to the tribe Paromalini within the subfamily Dendrophilinae. Species in this genus share the compact, often oval body form characteristic of histerid beetles.
Platysoma
clown beetles
Platysoma is a genus of clown beetles (family Histeridae) comprising over 80 described species. Members are small, compact beetles that inhabit subcortical environments beneath tree bark. They are predatory throughout their life cycle, specializing in bark beetle prey. The genus is notable among Histeridae for exhibiting facultative egg predation behavior in adults.
Platysomatini
clown beetles
Platysomatini is a tribe of clown beetles (family Histeridae) established by Bickhardt in 1914. The tribe contains at least 30 genera and approximately 380 described species, making it one of the more species-rich tribes within Histerinae. Members are found across multiple continents and are documented in over 1,000 iNaturalist observations.
Plegaderus
clown beetles
Plegaderus is a genus of small clown beetles in the family Histeridae, established by Erichson in 1834. The genus contains more than 30 described species. These beetles belong to the subfamily Abraeinae and tribe Plegaderini. Members are found primarily in the Northern Hemisphere, with records from Denmark, Norway, and Sweden.
Pseudepierus
clown beetles
Pseudepierus is a genus of clown beetles (family Histeridae) established by Casey in 1916. The genus contains at least two described species: P. gentilis and P. italicus. Like other histerids, these beetles are likely associated with decomposing organic matter, though specific ecological details remain poorly documented.
Renclasea
clown beetles
Renclasea is a genus of clown beetles (family Histeridae) erected by Tishechkin and Caterino in 2009. The genus comprises six described species, all described in the same 2009 publication. All species within the genus share the same authorship and year of description. As a member of subfamily Haeteriinae, it belongs to a group of histerid beetles often associated with social insects.
Reninus
Reninus is a genus of clown beetles (family Histeridae) established by Lewis in 1889. The genus contains approximately 13 described species, all classified within the subfamily Haeteriinae. Members of this genus are small beetles associated with the broader ecological habits of histerid beetles, though specific biological details for the genus remain poorly documented in available literature.
Saprininae
clown beetles
Saprininae is a subfamily of clown beetles within the family Histeridae, comprising over 50 genera and approximately 800 described species. The group is globally distributed but shows notable biogeographic variation, with particular diversity in arid and coastal habitats. Members exhibit diverse ecological associations, including free-living predators, myrmecophiles, and termitophiles.
Saprinus
clown beetles
Saprinus is a genus of clown beetles in the family Histeridae, containing more than 200 described species. Members are found on every continent except Antarctica. The genus includes species associated with carrion, dung, and other decaying organic matter, where they function as predators of other small insects. Some species have specialized associations with ants or termites.
Saprinus orbicularis
Saprinus orbicularis is a species of clown beetle in the family Histeridae, subfamily Saprininae. Members of this genus are typically small, spherical, highly polished beetles associated with carrion, dung, and other decomposing organic matter. The species is predatory on other small insects found in these habitats. Like other histerids, it exhibits defensive behaviors including playing dead when disturbed.
Stictostix
Stictostix is a genus of clown beetles (family Histeridae) established by Marseul in 1870. It belongs to the subfamily Tribalinae within the diverse beetle superfamily Histeroidea. The genus contains relatively few documented species and remains poorly studied compared to more speciose histerid genera. Species in this genus are associated with forest floor and decaying wood habitats, where they function as predators of other small invertebrates.
Strigister
Strigister is a genus of clown beetles in the family Histeridae, erected in 2013. The genus contains two described species: Strigister simoni and Strigister tecolotito. Like other histerids, members of this genus are likely associated with decomposing organic matter, though specific ecological details remain limited.
Teretriosoma
clown beetles
Teretriosoma is a genus of clown beetles in the family Histeridae, established by Horn in 1873. The genus comprises approximately 11 described species distributed primarily in the Americas. One species, Teretriosoma nigrescens, has been extensively studied as a biological control agent against the larger grain borer Prostephanus truncatus, a major pest of stored maize and cassava in Africa and Latin America. Members of this genus are small predatory beetles associated with decomposing organic matter and stored products.
Xestipyge
clown beetles
Xestipyge is a genus of clown beetles in the family Histeridae, established by Marseul in 1862. The genus contains at least 10 described species distributed across North America, Europe, Asia, and Africa. Species in this genus are small histerid beetles associated with forest and woodland habitats.