Tetradonia

Wasmann, 1894

Species Guides

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Tetradonia is a of rove beetles (Staphylinidae: Aleocharinae) that are obligate of army ants in the New World. These beetles are the only described symbionts known to regularly prey on army ant , primarily targeting dying or injured individuals. specificity varies considerably among , ranging from that associate with multiple Eciton species to restricted to single host species. The genus was established by Wasmann in 1894 and currently contains at least five described species, with ongoing research revealing additional diversity through integrative .

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Pronunciation

How to pronounce Tetradonia: /ˌtɛtrəˈdoʊniə/

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Identification

Tetradonia can be distinguished from other army ant-associated rove beetles by morphological features detailed in species-level keys, including antennal proportions and elytral surface texture. Tetradonia laselvensis has longer than the combined length of , pronotum, and , while T. cf. marginalis has shorter antennae with segments IX and X almost as long as wide and weakly granulate-punctate elytra. Accurate identification requires examination of these subtle morphological characters combined with association data.

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Habitat

Strictly associated with army ant colonies in tropical rainforest environments. Found during colony emigrations, raids, and at refuse deposits. Documented from lowland tropical forest at La Selva Biological Station, Rica (elevation 67 m).

Distribution

New World tropics. Documented from Rica (La Selva Biological Station) and Colombia (Parque Nacional Natural Serranía de Chiribiquete). Associated with army ant across the Neotropical range of Eciton and Neivamyrmex .

Diet

of army ant . Unlike most army ant myrmecophiles, Tetradonia beetles regularly kill and feed on adult workers, primarily targeting dying or injured individuals.

Host Associations

  • Eciton burchellii foreli - such as T. laticeps parasitize this
  • Eciton hamatum - for both and Tetradonia
  • Eciton vagans angustatum -
  • Eciton dulcium crassinode -
  • Eciton mexicanum -
  • Eciton lucanoides conquistador -
  • Neivamyrmex gibbatus -
  • Neivamyrmex pilosus mexicanus -

Behavior

Attacks army ant during colony emigrations. Exhibits varying degrees of specificity: some are associating with all six local Eciton species, while others are primarily restricted to E. hamatum.

Ecological Role

Myrmecophile and within army ant - . Occupies a unique trophic position as the only described symbiont that regularly preys on army ant .

Similar Taxa

  • Other Aleocharinae myrmecophilesTetradonia is distinguished by its unique predatory on army ant ; most other army ant-associated beetles are commensals or scavengers rather than active of adult ants.

More Details

Taxonomic History

Originally described by Wasmann in 1894. A 2016 integrative taxonomic study using and (COI, wingless, and CAD genes) identified five at La Selva Biological Station, including two new to science.

Research Significance

The discovery of Tetradonia's predatory on army ants challenges the paradigm that army ant myrmecophiles are universally non-lethal commensals. This makes the important for understanding the evolution of - relationships in social insect colonies.

Sources and further reading