Aphodiinae

Leach, 1815

Small Dung Beetles

Tribe Guides

7

is a large and diverse of Scarabaeidae comprising more than 3,500 described across over 380 and 12 tribes. Members are commonly known as small dung beetles, though not all species are associated with . The subfamily exhibits varied life strategies including , detritivory, saprophagy, , inquilinism in or nests, and sand-dwelling habits. Aphodiines are found worldwide in diverse from temperate rainforests to alpine zones and coastal dunes.

Psammodius pierottii by no rights reserved, uploaded by Nick Bédard. Used under a CC0 license.Stenotothorax badipes by (c) jimeckert49, some rights reserved (CC BY). Used under a CC-BY license.Tetraclipeoides anomaliceps by (c) Elliott Gordon, some rights reserved (CC BY), uploaded by Elliott Gordon. Used under a CC-BY license.

Pronunciation

How to pronounce Aphodiinae: /ˌæfoʊdiˈaɪniː/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

Distinguished from Scarabaeinae (true dung beetles) by smaller body size, widened covering reduced , and generally less robust build. Separation from other scarabaeid requires examination of tarsal structure, clypeal , and overall body proportions. -level identification often requires dissection of male genitalia and examination of spermathecal structure in females.

Images

Appearance

Small scarab beetles, most less than 8 millimeters in length. typically small and concealed beneath a widened , the exoskeletal plate above the mouth. with clawed feet. Body form compact, consistent with scarabaeoid but generally more diminutive than Scarabaeinae.

Habitat

Ecologically diverse; includes temperate rainforests, high-elevation Andean grasslands, Patagonian steppe, coastal sand dunes, subantarctic beech forest, and alpine zones above 1600 m elevation. Some are in or nests. Sand-dwelling species occur in coastal and arid environments.

Distribution

Worldwide distribution. Documented from all major biogeographic regions including Australian, Oriental, Palearctic, Nearctic, Neotropical, and Afrotropical regions. Specific records include: North America (Kansas prairie), South America (Colombia, with 76 and 30 ), mainland Southeast Asia (Malaysia, Thailand, Laos, Vietnam, China), Northern Caucasus (Karachay-Cherkessia, Kabardino-Balkaria, North Ossetia, Dagestan), and Baltic amber deposits (Eocene fossil species).

Diet

Varied feeding strategies documented: ( feeding), detritivory, saprophagy (dead plant and animal matter), and . Carrion has been observed as a secondary food resource. Some tropical forest are primarily necrophagous where large herbivore dung is scarce.

Host Associations

  • Ants - Some live in nests
  • Termites - Some live in nests

Life Cycle

Complete with , larval, pupal, and stages. Third instar larvae and pupae described for some ; pupal size ranges 9-12 mm in documented examples. Preimaginal provides diagnostic characters for species separation.

Behavior

Many are 'dwellers' that crawl into rather than rolling or tunneling. Research on elephant dung in Africa found that 98% of dung beetles active at night were aphodiine dwellers, versus only 9.2% during daytime. Aphodiines are reportedly stronger fliers than tunneling or rolling dung beetles, potentially leading to underestimation of their abundance in trap-based studies. Attraction to carrion has been demonstrated; some species show preference for cranial () end of carcasses over caudal (tail) end, suggesting direct attraction to carrion rather than to exposed gut contents.

Ecological Role

removal and nutrient cycling in terrestrial . Role in dung removal has been suggested as underestimated due to capability and trap avoidance. Contribution to carrion decomposition documented but extent varies by and .

Human Relevance

Used in for estimating circumstances of death, though less reliable than necrophagous beetles due to non-exclusive carrion feeding. Potential utility in forensic applications may improve with further research on carrion feeding .

Similar Taxa

  • ScarabaeinaeTrue dung beetles; distinguished by larger body size, more robust build, and different -processing (tunneling, rolling) versus the dwelling behavior typical of many aphodiines
  • GeotrupidaeDor beetles; similar -associated but distinguished by tarsal structure, body form, and burrowing

More Details

Taxonomic Diversity

Comprises 12 tribes, more than 380 , and over 3,500 described according to Catalog of Life and World Scarabaeidae Database (2023). Tribes include Aphodiini, Corythoderini, Eupariini, Hornietiini, Odochilini, Odontolochini, Psammodiini, Rhyparini, Stereomerini, Termitoderini, Thinorycterini, and the extinct †Psammaegialiini.

Fossil Record

Eocene Baltic amber preserves at least three aphodiine including Airapus lithuanicus and previously described Saprosites succini and Ataenius europaeus.

Tags

Sources and further reading