Planolinus

Planolinus species are small aphodiine dung beetles, generally 4-8 mm in length. They can be distinguished from related genera by the combination of: clypeus with distinct marginal teeth or angles; pronotum with characteristic lateral marginal setae arrangement; and elytra with reduced or absent striae. The mesosternum is typically not elevated between the mesocoxae. Species-level identification requires examination of male genitalia and detailed microsculpture patterns.

Found in habitats with mammal dung, including pastures, grasslands, forest edges, and agricultural areas. Often occurs in moist, organic-rich soils. Some species have been recorded from sandy substrates.

Palaearctic, Oriental, and Nearctic regions. Records extend from Europe and North Africa through Asia to North America.

Activity patterns vary by species and region. Most species are active during spring and summer months in temperate zones, with some extending into autumn.

Dung-feeding; adults and larvae consume mammal dung, particularly from herbivores.

Complete metamorphosis with egg, larva, pupa, and adult stages. Larvae develop within or adjacent to dung pats. Development time varies with temperature and substrate quality.

Adults are active during daylight hours and at dusk. They tunnel beneath dung pats to feed and oviposit. Some species are known to fly to fresh dung. Burrowing behavior creates vertical tunnels in soil beneath dung sources.

Contributes to dung decomposition and nutrient cycling in grassland and pastoral ecosystems. Tunneling activity aerates soil and facilitates dung incorporation. Serves as prey for birds and small mammals.

Beneficial in agricultural systems through dung removal, reducing pasture fouling and pest fly breeding. Occasionally referenced in biodiversity assessments of grazed landscapes.

• AphodiusClosely related and sometimes synonymized; Planolinus differs in clypeal structure and pronotal setal patterns. Historically treated as a subgenus of Aphodius by some authorities.
• MelinopterusOverlapping size range and habitat; Melinopterus species typically have more strongly convex elytra and different pronotal marginal structure.
• TeuchestesSimilar small aphodiines; Teuchestes species generally lack the distinct clypeal teeth characteristic of Planolinus.

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life