Strumigenys paradoxa

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Strumigenys paradoxa
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Strumigenys
Species: S. paradoxa
Binomial name
Strumigenys paradoxa
(Bolton, 2000)

Strumigenys paradoxa inbiocri001259868 p 1 high.jpg

Strumigenys paradoxa inbiocri001259868 d 1 high.jpg

Specimen Labels

The single type specimen was collected at La Selva Biological Station. It was from a 10cm deep soil/litter core placed in a Berlese funnel. The soil core came from trap site 3 of the ALAS project, La Selva GIS 1498/1848 (along Hartshorn trail), a site with old-growth wet forest on alluvial soil (Longino, Ants of Costa Rica). Close to a dozen subsequent collections suggest this is a wet forest species that inhabits that leaf litter.


The only member of the Strumigenys paradoxa-group.

Longino (Ants of Costa Rica) - Mandible relatively short and curved downward; leading edge of the scape lacking projecting hairs; propodeum unarmed, although with a lamella extending up posterior face; face smooth and shining; color orange.

Keys including this Species


Distribution based on Regional Taxon Lists

Neotropical Region: Costa Rica (type locality), Honduras.

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb


Strumigenys were once thought to be rare. The development and increased use of litter sampling methods has led to the discovery of a tremendous diversity of species. Many species are specialized predators (e.g. see Strumigenys membranifera and Strumigenys louisianae). Collembola (springtails) and other tiny soil arthropods are typically favored prey. Species with long linear mandibles employ trap-jaws to sieze their stalked prey (see Dacetine trap-jaws). Larvae feed directly on insect prey brought to them by workers. Trophallaxis is rarely practiced. Most species live in the soil, leaf litter, decaying wood or opportunistically move into inhabitable cavities on or under the soil. Colonies are small, typically less than 100 individuals but in some species many hundreds. Moist warm habitats and micro-habitats are preferred. A few better known tramp and otherwise widely ranging species tolerate drier conditions. Foraging is often in the leaf litter and humus. Workers of many species rarely venture above ground or into exposed, open areas. Individuals are typically small, slow moving and cryptic in coloration. When disturbed individuals freeze and remain motionless. Males are not known for a large majority of species.



The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.

  • paradoxa. Pyramica paradoxa Bolton, 2000: 210, figs. 145, 183 (w.) COSTA RICA. Combination in Strumigenys: Baroni Urbani & De Andrade, 2007: 125

Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.



Holotype. TL 1.7, HL 0.44, HW 0.34, CI 77, ML 0.07, MI 16, SL 0.18, SI 53, PW 0.22, AL 0.44. Eye minute, of a single ommatidium. Dorsal surfaces of clypeus and head capsule smooth and shining. Alitrunk almost entirely smooth and shining, without sculpture except for propodeal declivity where some faint punctulation is visible. Dorsum of petiole node and disc of postpetiole glassy smooth. Basigastral costulae sharply developed and dense, arising across the whole width of the tergite and extending back over more than half the length of the sclerite. Spaces between costulae, and sclerite behind them, glassy smooth. Ground-pilosity of vertex sparse, of slender medially-curved small hairs that tend to be slightly flattened or splayed at their extreme apices. In full-face view some of these hairs project beyond the lateral outline of the occipital lobes and are curved anteriorly. With head in profile the dorsum with two pairs of much longer straight erect slender hairs; first pair arises on dorsum just behind level of scrobe apex, second pair arises more posteriorly and laterally. Dorsal alitrunk with ground-pilosity as head, promesonotum also with 6-7 pairs of erect fine straight hairs. First gastral tergite with short decumbent ground-pilosity that curves toward the midline, and with a number of longer fine erect simple hairs. Petiole node in dorsal view broader than long, the lateral spongiform lobes conspicuously projecting on each side. Disc of postpetiole with anterior margin almost transverse, the sides markedly convergent posteriorly behind the prominent anterolateral angles; posterior margin convex. Femoral and tibial glands reduced to small pale marks on the cuticle that are very difficult to discern.

Type Material

Holotype worker, Costa Rica: Heredia, Est. BioI. La Selva, 50-150 m., 10°26'N, 84°01'W, l.iii.1994, INBio-OET, bosque primario, B/03/41 1 (J. Longino) (The Natural History Museum).


  • Baroni Urbani, C. & De Andrade, M.L. 2007. The ant tribe Dacetini: limits and constituent genera, with descriptions of new species. Annali del Museo Civico di Storia Naturale “G. Doria” 99:1-191.
  • Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028. (page 210, figs. 145, 183 worker described)