Solenopsis leptanilloides

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Solenopsis leptanilloides
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Solenopsidini
Genus: Solenopsis
Species complex: pygmaea
Species: S. leptanilloides
Binomial name
Solenopsis leptanilloides
Santschi, 1925

Solenopsis leptanilloides casent0103202 p 1 high.jpg

Solenopsis leptanilloides casent0103202 d 1 high.jpg

Specimen Labels

Nothing is known about the biology of Solenopsis leptanilloides.


A New World thief ant that is a member of the pygmaea species complex.

Pacheco and Mackay (2013) – Worker This is a very small concolorous pale yellow species. The head is elongate with coarse punctures. The lateral clypeal teeth are angular and the extralateral teeth are absent. The clypeal carinae are nearly absent in this species. The notopropodeal suture is weakly depressed. The postpetiole is oval-shaped when viewed dorsally. Solenopsis leptanilloides could be confused with Solenopsis pygmaea (North America) but can be distinguished by its more elongate head. Additionally S. pygmaea has more developed, sharp lateral clypeal teeth that extend past the anterior clypeal margin, which is easily distinguished from the short, angular clypeal teeth with S. leptanilloides.

Solenopsis leptanilloides may be confused with Solenopsis westwoodi (southern South America), but can be distinguished as it is pale yellow, not medium dark brown as S. westwoodi. Moreover, although S. westwoodi has coarse cephalic punctures, they are scattered and smooth and shiny between, compared to the numerous punctures present in S. leptanilloides. Solenopsis leptanilloides is also similar to Solenopsis dysderces as both species have noticeably elongate heads. Close comparison reveals that S. dysderces has a larger head, in length, width and when measured from the dorsal to ventral surface. Additionally, S. leptanilloides has a noticeably slender body compared to the more robust S. dysderces. Solenopsis dysderces is only known from the mountains of Chile, while S. leptanilloides is found in northeastern Argentina.

Keys including this Species


Santa Fe, Rosario, Argentina.

Distribution based on Regional Taxon Lists

Neotropical Region: Argentina (type locality).

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb



Known only from the worker caste.



The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.

  • leptanilloides. Solenopsis (Diplorhoptrum) leptanilloides Santschi, 1925e: 159, fig. 4 (w.) ARGENTINA. See also: Pall & Quirán, 2009: 381.

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



Pacheco and Mackay (2013) - Measurements (n=6). TL 0.960-l.20 (l.06); HL 0.312-0.360 (0.335); HW 0.240; EL 0.012; ED 0.012; SL 0.180-0.198 (0.183); FSL 0.060-0.066 (0.061); CI 66.7-76.9 (71.9); SI 50.0-60.0 (54.8); PL 0.060-0.084 (0.070); PW 0.072-0.084 (0.077); PI 83.3-100.0 (90.7); PPL 0.066-0.078 (0.072); PPW 0.072-0.102 (0.085); PPI 76.5-92.3 (85.3); WL 0.210-0.240 (0.224); PSL 0.018; PSW 0.018.

Small, concolorous pale yellow; head much longer than wide, with coarse cephalic punctures; lateral clypeal teeth angular, extralateral teeth absent; clypeal carinae nearly absent; scape short, reaches about ¾ length of head; minor funicular segments 3-8 short; mesopleuron smooth and shiny; notopropodeal suture weakly depressed, mesonotum and propodeum on straight line at dorsal mesosomal margin; propodeal spiracle small; posterior propodeal margin rounded; petiole slightly wider than postpetiole viewed laterally, postpetiole oval viewed dorsally.

Not very pilose; head with short (0.006-0.010 mm) erect and suberect hairs; scape pilose with suberect hairs; most suberect hairs on mesosoma, petiole and postpetiole curve posteriorly.

Type Material

Argentina, Santa Fe, Rosario (Hubrich), Sammlung, Dr. F. Santschi, Kairouan (lectotype worker and 5 paralectotype workers [here designated] Naturhistorisches Museum, Basel). M.C.Z. Cotype 1-2 21914, Wm. M. Wheeler (2 cotype workers [seen] Museum of Comparative Zoology). Rosario, Argentina, Hubrich (1 cotype worker [seen] Los Angeles County Museum of Natural History).


References based on Global Ant Biodiversity Informatics

  • Cuezzo, F. 1998. Formicidae. Chapter 42 in Morrone J.J., and S. Coscaron (dirs) Biodiversidad de artropodos argentinos: una perspectiva biotaxonomica Ediciones Sur, La Plata. Pages 452-462.
  • Kempf, W.W. 1972. Catalago abreviado das formigas da regiao Neotropical (Hym. Formicidae) Studia Entomologica 15(1-4).
  • Kusnezov N. 1978. Hormigas argentinas: clave para su identificación. Miscelánea. Instituto Miguel Lillo 61:1-147 + 28 pl.
  • Pacheco J. A., and W. P. Mackay. 2013. The systematics and biology of the New World thief ants of the genus Solenopsis (Hymenoptera: Formicidae). Lewiston, New York: Edwin Mellen Press, 501 pp.
  • Pall J. L. M., and E. M. Quiran. 2009. Redescripción de la obrera de Solenopsis leptanilloides (Hymenoptera: Formicidae) y primera cita de la provincia de La Pampa (Argentina). Revista de la Sociedad Entomológica Argentina 68: 381-383.
  • Santschi F. 1925. Fourmis des provinces argentines de Santa Fe, Catamarca, Santa Cruz, Córdoba et Los Andes. Comunicaciones del Museo Nacional de Historia Natural "Bernardino Rivadavia" 2: 149-168.
  • Ulyssea M. A., C. R. F. Brandao. 2013. Catalogue of Dacetini and Solenopsidini ant type specimens (Hymenoptera, Formicidae, Myrmicinae) deposited in the Museu de Zoologia da Universidade de Sao Paulo, Brazil. Papies Avulsos de Zoologia 53(14): 187-209.
  • Vittar, F. 2008. Hormigas (Hymenoptera: Formicidae) de la Mesopotamia Argentina. INSUGEO Miscelania 17(2):447-466
  • Vittar, F., and F. Cuezzo. "Hormigas (Hymenoptera: Formicidae) de la provincia de Santa Fe, Argentina." Revista de la Sociedad Entomológica Argentina (versión On-line ISSN 1851-7471) 67, no. 1-2 (2008).