Leptogenys

Roger, 1861

Razorjaw Ants

Species Guides

2

Leptogenys is the most diverse in the Ponerinae, with over 260 described distributed throughout tropical and subtropical regions worldwide. The genus exhibits remarkable morphological and behavioral diversity, ranging from large-eyed epigaeic species that forage above ground to small-eyed cryptobiotic species inhabiting soil and leaf litter. Many species possess distinctive falcate, bowed and specialize on isopod prey. Most species have ergatoid (-like) queens rather than typical winged queens.

Leptogenys manni by no rights reserved, uploaded by Lyn Roueche. Used under a CC0 license.Leptogenys by (c) Sam Kieschnick, some rights reserved (CC BY), uploaded by Sam Kieschnick. Used under a CC-BY license.Leptogenys by (c) Jake Nitta, some rights reserved (CC BY), uploaded by Jake Nitta. Used under a CC-BY license.

Pronunciation

How to pronounce Leptogenys: /ˌlɛp.toˈd͡ʒɛ.nɪs/

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Identification

can be distinguished by the pectinate (comb-like) margin of the tarsal claws, a diagnostic feature for the . Many have falcate, bowed that are highly modified compared to other ponerine ants. The genus shows extreme variation in size and body form correlated with : epigaeic species have large eyes and long legs, while cryptobiotic soil-dwelling species have reduced eyes and more compact bodies.

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Habitat

Occurs in tropical and subtropical forests from rainforest floor to . Epigaeic forage on the ground surface and in vegetation; cryptobiotic species inhabit soil layers and leaf litter. Some species conduct swarm raids across extensive areas of forest floor.

Distribution

Widespread throughout tropical and subtropical regions globally. In the continental United States, only two are documented: Leptogenys elongata (central and eastern Texas, southern Oklahoma, western Louisiana, and Mexico) and Leptogenys manni (Florida). Southeast Asian species documented from Cambodia, Malaysia, and Borneo.

Diet

Many are on isopod prey. Some species are taking spiders, , millipedes, earthworms, flatworms, insects, and occasionally small vertebrates including frogs and snakes.

Behavior

Some exhibit army ant-like swarm raids with tens of thousands of forming fan-shaped fronts spanning up to 300 square meters. Raids typically begin at dusk and continue through night. Workers use cooperative hunting: when prey is encountered, scores of workers rapidly attack, immobilizing victims with bites and stings. Large prey such as millipedes are subdued through repeated stinging, then dismembered and transported to the nest. Workers form living chains to drag heavy prey, similar to festooning . Colonies are nomadic, relocating every few days as prey is depleted; emigrations are orderly with pupae and larvae carried first, in entourage, and workers guarding the route.

Ecological Role

Major in tropical forest . Through swarm raiding, they regulate of soil and litter invertebrates including isopods, millipedes, and other arthropods. Their nomadic lifestyle creates disturbance regimes that may influence structure of competing and prey populations.

Similar Taxa

  • Eciton (army ants)Both conduct swarm raids with massive columns, but Leptogenys is in Ponerinae while Eciton is in Dorylinae; Leptogenys lacks the true army ant of complete loss and male-only mating .
  • Dinomyrmex gigas (Malaysian giant forest ants)Both are large-bodied ants in Bornean rainforests, but Dinomyrmex is in Formicinae, forages primarily at night for honeydew in , and does not exhibit swarm raiding .

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