Strumigenys infidelis

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Strumigenys infidelis
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Strumigenys
Species: S. infidelis
Binomial name
Strumigenys infidelis
Santschi, 1919

Strumigenys infidelis casent0178643 profile 1.jpg

Strumigenys infidelis casent0178643 dorsal 1.jpg

Specimen labels

Known from a cloud forest and plantain planting.


Bolton (2000) - A member of the Strumigenys louisianae-group. Material of this species is sparse. S. infidelis has the same preapical dentition and the deep narrow postbuccal groove seen in Strumigenys louisianae, but lacks the flagellate humeral hairs of that species. For this reason I have revived infidelis from the synonymy of louisianae where Brown (1962b) left it.

Keys including this Species


Latitudinal Distribution Pattern

Latitudinal Range: 10.35722222° to -64.3°.

Tropical South

Distribution based on Regional Taxon Lists

Neotropical Region: Argentina (type locality), Bolivia, Brazil, Venezuela.

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb

Countries Occupied

Number of countries occupied by this species based on AntWiki Regional Taxon Lists. In general, fewer countries occupied indicates a narrower range, while more countries indicates a more widespread species.

Estimated Abundance

Relative abundance based on number of AntMaps records per species (this species within the purple bar). Fewer records (to the left) indicates a less abundant/encountered species while more records (to the right) indicates more abundant/encountered species.


Explore-icon.png Explore Overview of Strumigenys biology 
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 Online Catalogue of the Ants of the World.

  • infidelis. Strumigenys infidelis Santschi, 1919f: 48 (w.) ARGENTINA. Junior synonym of louisianae: Brown, 1953g: 28; revived from synonymy: Bolton, 2000: 523.

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



Bolton (2000) - TL 2.0-2.2, HL 0.50-0.54, HW 0.44-0.46, CI 85-88, ML 0.28-0.29, MI 52-56, SL 0.29-0.31, SI 66-67, PW 0.24-0.27, AL 0.52-0.55 (3 measured).

Mandible without a denticle proximal to the preapical tooth. With head in profile postbuccal groove narrow and deeply incised. Apicoscrobal hair short and stiff, remiform. Cephalic dorsum with a single pair of short standing hairs, close to occipital margin. Pronotal humeral hair narrowly remiform; mesonotal standing hairs remiform, broader than humeral hairs. Ventral surface of petiole without trace of spongiform tissue.

Type Material

Bolton (2000) - Syntype workers, ARGENTINA: La Plata (Bruch) (Museu de Zoologia da Universidade de Sao Paulo) [examined].


References based on Global Ant Biodiversity Informatics

  • Bolton, B. 2000. The Ant Tribe Dacetini. Memoirs of the American Entomological Institute 65
  • Fernandes I., and J. de Souza. 2018. Dataset of long-term monitoring of ground-dwelling ants (Hymenoptera: Formicidae) in the influence areas of a hydroelectric power plant on the Madeira River in the Amazon Basin. Biodiversity Data Journal 6: e24375.
  • Fernández, F. and S. Sendoya. 2004. Lista de las hormigas neotropicales. Biota Colombiana Volume 5, Number 1.
  • Rodriguez E. R., and J. E. Lattke. 2012. Diversidad de hormigas en un gradiente altitudinal de la cordillera de la Costa, Venezuela. Boletín de la Sociedad Entomológica Aragonesa (S.E.A.) 50: 295?304.
  • Silva T. S. R., and R. M. Feitosa. 2019. Using controlled vocabularies in anatomical terminology: A case study with Strumigenys (Hymenoptera: Formicidae). Arthropod Structure and Development 52: 1-26.