Specimen: Costa Rica, Prov. Heredia: La Selva (J. Longino 3202-s). INBIOCRI001237627. Image by J. Longino.
Specimen: Costa Rica, Prov. Heredia: La Selva (J. Longino 3202-s). INBIOCRI001237627. Image by J. Longino.
Dacetini, Myrmicinae, Formicidae, Hymenoptera, Insecta, Arthropoda, Animalia
John T. Longino, The Evergreen State College, Olympia WA 98505 USA.
22 April 1997
Specimen: Costa Rica, Prov. Heredia: La Selva (J. Longino 3202-s). INBIOCRI001237627. Image by J. Longino.
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Specimen: Costa Rica, Prov. Heredia: La Selva (J. Longino 3202-s). INBIOCRI001237627. Image by J. Longino. |
Identification
Apical fork of mandible with no intercalary teeth; mandible with two strong preapical teeth; eye bordered anteriorly by a deep notch, clearly visible in face view.
Head length 0.57-0.62mm, mandible length 0.30-0.34, CI 70-74, MI 53-55 (n=11 workers from 9 localities; Brown 1962).
Range
Pantropical tramp species originating in Africa (Brown 1954). New World distribution: Florida; widespread in West Indies, from Cuba to Trinidad; Guyana; Costa Rica (Atlantic lowlands).
Natural History
Brown and Wilson (1959) summarize the genus as follows:
"Widespread in tropics and warm temperate areas. Primarily forest-dwelling; some species occur in grassland and arid scrub. ... Nests mostly in soil and rotting wood; a few species live in arboreal plant cavities in tropical rain forest. Foraging hypogaeic to epigaeic-arboreal. Food: most species are collembolan feeders; a few are polyphagous predators or occasionally feed on sugary substances..."
rogeri is native to Africa but has spread, along with human commerce, to many parts of the globe. It occurs in Hawaii, Fiji, greenhouses in England and Scotland, Florida, and many islands in the Caribbean. In the mainland Neotropics, I know of records from Guyana and the ones reported here for Costa Rica. Nests are in and under dead wood on the ground. Workers preferentially prey on entomobryoid Collembola and Campodeidae, but also take a variety of other small arthropods (Brown 1954).
At La Selva Biological Station, rogeri occurs in leaf litter deep within mature rainforest. Thus, it appears to be one of the few exotics that can invade mature forest, rather than being restricted to synanthropic habitats.
Selected Records
Winkler and/or Berlese samples from La Selva.
Literature Cited
Brown, W. L., Jr. 1954. The ant genus Strumigenys Fred. Smith in the Ethiopian and Malagasy regions. Bulletin of the Museum of Comparative Zoology 112:3-34.
Brown, W. L., Jr. 1962. The neotropical species of the ant genus Strumigenys Fr. Smith: Synopsis and keys to the species. Psyche 69:238-267.
Brown, W. L., Jr., Wilson, E. O. 1959. The evolution of the dacetine ants. Quarterly Review of Biology 34:278-294.
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