Strumigenys marginiventris

Brown (1962) - Nests in the soil, often in paths or other openings, in rain forest or plantations, and the workers forage over the open ground among leaves or herbs by day as well as night. Common on Barro Colorado Island [Panama]. Longino (Ants of Costa Rica) - I have never encountered this species in Winkler samples from Costa Rica. My collecting is biased toward closed canopy mature forest, where there is a litter layer. This supports Brown's observations that this species prefers open areas and synanthropic habitats.

Identification
Bolton (2000) - A member of the Strumigenys marginiventris-group. The sharp lateral marginations of the first gastral tergite are unique and immediately diagnostic of this species. Within the group marginiventris is the only species to have a broad convex lamella on the propodeal declivity, all other known species have merely a narrow concave carina.

Longino (Ants of Costa Rica) - Apical fork of mandible without intercalary teeth; mandible with one strong preapical tooth; dorsum of gaster with raised lateral margins; gaster punctulate-striolate, opaque; gaster with long flagelliform setae.

Distribution based on Regional Taxon Lists
Neotropical Region: Colombia, Costa Rica, Honduras, Panama, Venezuela.

Nomenclature

 *  marginiventris. Strumigenys (Strumigenys) fusca st. marginiventris Santschi, 1931c: 275 (w.) PANAMA. Brown, 1958e: 127 (q.). Raised to species: Brown, 1958e: 126. See also: Bolton, 2000: 543.

Worker
Bolton (2000) - TL 2.8-3.1, HL 0.70-0.75, HW 0.55-0.59, CI 78-80, ML 0.54-0.56, MI 73-77, SL 0.53-0.60, SI 95-102, PW 0.30-0.35, AL 0.68-0.75. Preapical tooth small, slender and peg-like to tuberculiform, tending to arise from dorsum of mandible rather than from inner margin. Long flagellate hairs present: in apicoscrobal position; on pronotal humerus; a pair on mesonotum; several on dorsa of petiole and postpetiole; abundant on first gastral tergite. Cephalic dorsum with a single pair of erect simple hairs located near occipital margin. Propodeal teeth subtended by a broad lamella that has a shallowly convex posterior (free) margin. Petiole ventrally with a spongiform strip. First gastral tergite with a sharply raised longitudinal ridge or carina on each side that separates dorsal and lateral surfaces of tergite and extends almost entire length of sclerite. Head, alitrunk and waist segments reticulate-punctate, most surfaces usually also with some weak overlying low longitudinal rugulae. Behind basigastral costulae the first tergite punctulate-striolate, more posteriorly the sclerite densely punctulate; gastral sculpture variable in intensity.

Type Material
Bolton (2000) - Holotype worker, PANAMA: France Field (A. Bierig) [not seen].

References based on Global Ant Biodiversity Informatics

 * Achury R., and A.V. Suarez. 2017. Richness and composition of ground-dwelling ants in tropical rainforest and surrounding landscapes in the Colombian Inter-Andean valley. Neotropical Entomology https://doi.org/10.1007/s13744-017-0565-4
 * Adams B. J., S. A. Schnitzer, and S. P. Yanoviak. 2019. Connectivity explains local ant community structure in a Neotropical forest canopy: a large-scale experimental approach. Ecology 100(6): e02673.
 * Bolton, B. 2000. The Ant Tribe Dacetini. Memoirs of the American Entomological Institute 65
 * Brown W. L. Jr. 1958. The neotropical species of the ant genus Strumigenys Fr. Smith: group of marginiventris Santschi. Journal of the New York Entomological Society 65: 123-128.
 * Brown W. L. Jr. 1962. The neotropical species of the ant genus Strumigenys Fr. Smith: synopsis and keys to the species. Psyche (Cambridge) 69: 238-267.
 * Donoso D. A. 2014. Assembly mechanisms shaping tropical litter ant communities. Ecography 37 doi: 10.1111/j.1600-0587.2013.00253.x
 * Fernández, F. and S. Sendoya. 2004. Lista de las hormigas neotropicales. Biota Colombiana Volume 5, Number 1.
 * INBio Collection (via Gbif)
 * Kempf, W.W. 1972. Catalago abreviado das formigas da regiao Neotropical (Hym. Formicidae) Studia Entomologica 15(1-4).
 * Levings S. C. 1983. Seasonal, annual, and among-site variation in the ground ant community of a deciduous tropical forest: some causes of patchy species distributions. Ecological Monographs 53(4): 435-455.
 * Longino J. et al. ADMAC project. Accessed on March 24th 2017 at https://sites.google.com/site/admacsite/
 * Santschi F. 1931. Fourmis de Cuba et de Panama. Revista de Entomologia (Rio de Janeiro). 1: 265-282.
 * Sosa-Calvo J., S. O. Shattuck, and T. R. Schultz. 2006. Dacetine ants of Panama: new records and description of a new species. Proceedings of the Entomological Society of Washington 108: 814-821.