Strumigenys quadrua

AntWiki: The Ants --- Online
Strumigenys quadrua
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Strumigenys
Species: S. quadrua
Binomial name
Strumigenys quadrua
Bolton, 2000

Strumigenys quadrua casent0900472 p 1 high.jpg

Strumigenys quadrua casent0900472 d 1 high.jpg

Specimen Labels

Nothing is known about the biology of Strumigenys quadrua.

Identification

Bolton (2000) - A member of the Strumigenys silvestrii-group. Despite the fact that both specimens are poorly mounted and have apparently suffered some abrasion, quadrua is easily recognised because of its 4-segmented antennae and extremely reduced preapical dentition. A few specimens of species in this group may show an apparently 5-segmented antenna, caused by the partial fusion of funicular segments 2 and 3, but in these individuals the fusion segment remains conspicuous, and they have at least one distinct preapical tooth on the mandible.

In the Neotropical Strumigenys fauna only the tramp species emmae also has 4-segmented antennae. The characters given in the key and under the species-group diagnoses quickly differentiate Strumigenys emmae from quadrua.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Neotropical Region: Brazil (type locality).

Distribution based on AntMaps

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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.
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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.
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Biology

Template:Strumigenys

Castes

Nomenclature

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

  • quadrua. Strumigenys quadrua Bolton, 2000: 557 (w.) BRAZIL.

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 0.38, HW 0.30, CI 79, ML 0.19, MI 50, SL 0.21, SI 70, PW 0.21, AL 0.40. Preapical armament of mandible of two minute vestigial denticles at least on right mandible, one just proximal and the other just distal of the mandibular midlength; denticles only properly visible at high magnification and with correct lighting so that in effect the mandible apparently lacks preapical dentition. Antenna with only 4 segments. Scape with an obtuse but abrupt subbasal bend, the hairs on the leading edge that curve toward the base of the scape longer than the maximum width of the scape. Ground-pilosity of head inconspicuous, simple to very narrowly linear-spatulate. Apicoscrobal hair apparently absent but specimens poorly mounted so this hair may have been dislodged. Pronotal humeral hair weakly flagellate; hairs on first gastral tergite flagellate. Sides of alitrunk smooth. Ventral surface of petiole without spongiform tissue; lateral spongiform lobe of petiole vestigial, scarcely more expanded than the posterior collar. Lamella on propodeal declivity narrow, angulate basally but not dentiform. Petiole node in dorsal view broader than long; disc of postpetiole and first gastral tergite smooth. Basigastral costulae at maximum longer than disc of postpetiole.

Paratype. TL 1.5, HL 0.38, HW 0.31, CI 82, ML 0.18, MI 47, SL 0.20, SI 65, PW 0.21, AL 0.41.

Type Material

Holotype worker, Brazil: Bahia, Ilheus, CEPEC-area Zoolog., km. 22 Ilheus-ltab., x.1986, no. 30 (J. Delabie) (Museu de Zoologia da Universidade de Sao Paulo).

Paratype. 1 worker with same data as holotype (The Natural History Museum).

References

  • Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028.