Strumigenys ruta

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

Strumigenys ruta casent0900480 p 1 high.jpg

Strumigenys ruta casent0900480 d 1 high.jpg

Specimen Labels

Nothing is known about the biology of Strumigenys ruta.

Identification

Bolton (2000) - A member of the Strumigenys silvestrii-group. Isolated from the same litter sample as the holotype of Strumigenys dyseides, the two are closely related but have different forms of gastral pilosity. S. ruta also differs from dyseides by having relatively shorter mandibles, a vestigial lateral spongiform lobe on the petiole, a reticulate-punctate postpetiole disc and a pair of standing hairs on the mesonotum. However, both belong to the same small complex of species, defined and differentiated under dyseides, where ruta appears to be the closest known relative of Strumigenys skia.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Neotropical Region: Brazil, Colombia (type locality).


Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

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.

Castes

Nomenclature

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

  • ruta. Strumigenys ruta Bolton, 2000: 557 (w.) COLOMBIA.

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

Description

Worker

Holotype. TL 1.5, HL 0.41, HW 0.32, CI 78, ML 0.21, MI 51, SL 0.26, SI 81, PW 0.22, AL 0.40. Spiniform preapical tooth of mandible separated from apicodorsal tooth by a distance at least equal to its own length. A tiny preapical denticle present just proximal of mandibular midlength. Scape with an obtuse but conspicuous subbasal bend; curved hairs on leading edge of scape spatulate, the longest of them about equal to the maximum width of the scape. Ground pilosity of cephalic dorsum narrowly spoon-shaped; close to occipital margin is a pair of slightly more erect straighter hairs but these are quite weakly differentiated from the ground-pilosity. Apicoscrobal hair very long, fine and flagellate. Pronotal humeral hair fine and flagellate; an erect pair of fine flagellate hairs on the mesonotum. Dorsum of first gastral tergite with widely spaced flagellate hairs that are much stouter than those on the head and alitrunk; these hairs do not arise from conspicuous pits. In structure the flagellate hairs of the first tergite appear thick or flattened to ribbon-like in their basal halves; slender and simple only in their apical sections. Similar but shorter, more flattened or ribbon-like, hairs present on dorsa of petiole and postpetiole. Surface of first gastral tergite between the flagellate hairs bare, without fine simple ground pilosity. Propodeum with a pair of small teeth, subtended by narrow lamellae. Petiole in profile without spongiform tissue ventrally and without a lateral spongiform lobe; node with height of anterior face greater than length of dorsal surface (discounting posterior collar). In dorsal view petiole node broader than long. Disc of postpetiole finely superficially reticulate-punctate. Basigastral costulae about as long as postpetiole disc.

Type Material

Holotype worker, Colombia: Putumayo, Villa Garzon, 23.vii.1977 (D. Jackson) (The Natural History Museum).

References

  • Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028. (page 557, worker described)

References based on Global Ant Biodiversity Informatics

  • Castano-Meneses G., R. De Jesus Santos, J. R. Mala Dos Santos, J. H. C. Delabie, L. L. Lopes, and C. F. Mariano. 2019. Invertebrates associated to Ponerine ants nests in two cocoa farming systems in the southeast of the state of Bahia, Brazil. Tropical Ecology 60: 52–61.
  • Sosa-Calvo J., T. R. Schultz, and J. S. LaPolla. 2010. A review of the dacetine ants of Guyana (Formicidae: Myrmicinae). Journal of Hymenoptera Research 19: 12-43.