Spilodiscus gloveri

The combination of black body with two red elytral maculations distinguishes Spilodiscus gloveri from most other North American histerids. The genus Spilodiscus is named for this spotted pattern. Within the genus, S. gloveri can be separated from congeners by subtle differences in the size, shape, and position of the red maculations, as well as details of the pronotal and elytral sculpture. Examination of male genitalia may be required for definitive identification. The species is most likely to be confused with other Spilodiscus species, particularly S. fenestratus, which also has red elytral markings but differs in maculation pattern and geographic range.

Small to medium-sized histerid beetle with a compact, oval body form typical of the family. The body is predominantly black with two prominent red maculations (spots) on the elytra. The elytral spots are a diagnostic feature of the genus Spilodiscus. As with other Histeridae, the antennae are short with a distinct club, and the elytra are abbreviated, exposing one or two abdominal tergites. The overall body shape is convex and streamlined.

Found in open, dry habitats including prairies, sand dunes, and scrublands. Associated with sandy or hard-packed soils. One documented observation occurred in a sandy area near yellow flowers (Pyrrhopappus pauciflorus) at the entrance to a state park. The species appears to favor early successional or disturbed open habitats with exposed ground.

Documented from the south-central and south-western United States. GBIF records indicate presence in Arkansas, Colorado, Illinois, Louisiana, Oklahoma, and Texas. The species has been specifically recorded from northwestern Oklahoma (Beaver Dunes State Park area) and likely occurs throughout the southern Great Plains and adjacent regions.

Adults have been observed in early May in Oklahoma, suggesting spring activity. Based on related species and habitat type, the species likely has a spring to early summer adult activity period, with possible extension into late summer in southern portions of its range.

One individual was observed crawling on bare ground near flowers, suggesting ground-dwelling or cursorial habits typical of many histerids. Like other Histeridae, adults are likely predatory or scavenging, associated with decaying organic matter or other insects. The species has been found by visual searching rather than by beating vegetation, suggesting it may spend significant time on the ground surface.

As a member of Histeridae, likely functions as a predator of other insects or their eggs and larvae, or as a scavenger in decomposition food webs. Histerids are commonly associated with dung, carrion, decaying fungi, and other decomposing organic substrates where they prey on fly larvae and other invertebrates. The specific ecological role of S. gloveri has not been documented.

No documented economic or medical importance. Of interest to coleopterists and natural historians due to its distinctive coloration and relative rarity in collections.

• Spilodiscus fenestratusAlso has red elytral maculations but differs in the size, shape, and arrangement of spots; ranges further east
• Other Histeridae with red markingsSeveral other genera (e.g., some Hister species) may have red markings, but differ in body shape, elytral coverage, and antennal structure

• Coleoptera
• Histeridae
• clown beetle
• North America
• Great Plains
• red-and-black beetle
• ground beetle
• spring-active

• BugGuide
• Wikipedia
• GBIF taxonomy match
• Catalogue of Life
• Cerambycidae | Beetles In The Bush | Page 3
• Bug Eric: National Moth Week Recap for Colorado Springs