Cholevinae

Kirby, 1837

small carrion beetles, round fungus beetles

Cholevinae is a of small within the (), containing more than 260 and over 1,100 described . The subfamily includes diverse ecological groups: species that feed on carrion and , mycophagous species associated with , and numerous troglobitic and troglophilic lineages adapted to subterranean . The tribe Leptodirini within Cholevinae represents one of the most diverse radiations of subterranean animals globally, with approximately 1,340 species and distributed from the Iberian Peninsula to Iran.

Cholevinae by (c) Nick Block, some rights reserved (CC BY), uploaded by Nick Block. Used under a CC-BY license.

Prionochaeta by (c) gonodactylus, some rights reserved (CC BY), uploaded by gonodactylus. Used under a CC-BY license.

Catoptrichus by no rights reserved, uploaded by Ben Keen. Used under a CC0 license.

Pronunciation

How to pronounce Cholevinae: /kɒˈlɛ.vɪ.iː/

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Identification

typically small (often 2–5 mm), with compact, rounded to elongate bodies. usually with 11 , often with weakly clubbed or gradually thickened segments. 55-5. through three ; first instar lacks secondary bristles present in later instars. Many subterranean show troglomorphic including depigmentation, reduced or absent , and elongated appendages. For species-level identification, examination of male () is typically required; some groups exhibit notable genitalic elaboration including asymmetric lobes.

Images

Habitat

Ecologically diverse: many are or in terrestrial including forests, grasslands, and semiarid environments from near sea-level to 3,050 m elevation. Numerous species are associated with subterranean environments—caves, hypogean habitats, and deep soil layers—ranging from troglophilic (facultative cave-dwellers) to troglobitic (obligate cave-dwellers). Some species are myrmecophilous or termitophilous, inhabiting or nests.

Distribution

Global distribution with centers of diversity in the Palearctic region, particularly Europe and the Mediterranean basin. The tribe Leptodirini is centered north of the Mediterranean from the Iberian Peninsula to Iran. Other occur across the Holarctic region, with records from North America (including Mexico with 18+ species of Dissochaetus), Central and South America, and various Pacific islands. Romanian fauna shows stronger affinity with Central Europe than the Balkan Peninsula.

Diet

feed on carrion; species feed on including bat guano in caves. Mycophagous species consume . Specific dietary habits for many subterranean species remain poorly documented.

Life Cycle

with , three larval , , and stages. Larval development has been studied in some : Sciodrepoides watsoni develops through temperaturedependent stages with thermal summation models established for 15–28°C regimes. First instar lack secondary bristles, which appear after the first . Development from egg to adult has been photographically documented in laboratory culture for some species.

Behavior

Many are active scavengers on carrion and . Subterranean species show reduced ability and high site fidelity. Some species exhibit phoretic or inquilinism in nests. When threatened, some related (and likely some Cholevinae) display (deathfeigning).

Ecological Role

and contribute to decomposition and . Subterranean species serve as indicators of cave health and paleoclimatic conditions. Some species have demonstrated utility in , though this application remains underdeveloped for the group. As for larger and small vertebrates in cave and soil ecosystems.

Human Relevance

Some have potential for estimating postmortem intervals. Subterranean species are used as bioindicators for cave and management. Taxonomic interest is high due to the group's exceptional subterranean radiation, with citizen science projects documenting new species. No significant agricultural or medical impacts documented.

Similar Taxa

Silphinae (Silphidae)Also contains ; distinguished by generally larger body size, different structure, and that often expose more of the .
StaphylinidaeSome share small size and similar ; distinguished by very short leaving most of exposed, and different tarsal formula.
Ptomaphagini (within Leiodidae)Closely related tribe within ; distinguished by subtle differences in mouthpart structure and male .

More Details

Taxonomic complexity

The contains the tribe Leptodirini, which has undergone extensive taxonomic revision with 20 new , 29 new , and multiple synonymies established in recent phylogenetic studies. The remains active with molecular reshaping generic boundaries.

Subterranean radiation

Leptodirini represents one of the most spectacular adaptive radiations of subterranean animals, with extensive morphological diversification including loss, depigmentation, and appendage elongation. The group has been used to study in cave environments.

Reproductive isolation

Experimental hybridization studies in troglobitic Ptomaphagus have demonstrated substantial reproductive isolation between morphologically distinct cave , supporting their recognition as full .