Strumigenys metopia

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Strumigenys metopia
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Strumigenys
Species: S. metopia
Binomial name
Strumigenys metopia
(Brown, 1959)

Strumigenys metopia casent0281983 p 1 high.jpg

Strumigenys metopia casent0281983 d 1 high.jpg

Specimen Labels

The two records of this species are from rainforest and a bamboo forest. Both were obtained via litter sampling.

Identification

Bolton (2000) - A member of the crassicornis-complex in the Strumigenys gundlachi group. The minute metopia is the only known species of the crassicornis-complex to possess flagellate hairs on the alitrunk.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Neotropical Region: Brazil, Colombia, Ecuador, Panama (type locality), Peru.


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 New General Catalogue, a catalogue of the world's ants.

  • metopia. Neostruma metopia Brown, 1959b: 11, fig. 2 (q.) PANAMA. Kempf, 1975a: 417 (w.). Combination in Pyramica: Bolton, 1999: 1672; in Strumigenys: Baroni Urbani & De Andrade, 2007: 124. See also: Bolton, 2000: 190.

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

Description

Worker

Bolton (2000) - TL 1.5-1.6, HL 0.40-0.41, HW 0.29-0.31, CI 72-75, ML 0.12-0.13, MI 30-31, SL 0.17-0.19, SI 60-63, PW 0.20-0.22, AL 0.38-0.40 (4 measured). Characters of crassicornis complex. Submedian tooth of mandible strongly developed; 3 minute denticles distal of submedian tooth and 2 proximal of it. Scape expanded at subbasal angle (similar to development seen in Strumigenys crassicornis but not as extensive), the scape distinctly broadest at this point, tapering to apex. Apicoscrobal hair curved and elongate. Pair of standing hairs on cephalic dorsum close to occipital margin may be only weakly differentiated from the conspicuous spatulate ground-pilosity. Pronotal humeral hair long and flagellate. Mesonotum with a single pair of long flagellate hairs. Postpetiole in profile swollen, subglobular; spongiform lobes very reduced.

Type Material

Holotype queen (dealate), PANAMA: Barro Colorado Island, 1938, no. 871 (N.A. Weber) (examined).

References

  • Baroni Urbani, C. & De Andrade, M.L. 2007. The ant tribe Dacetini: limits and constituent genera, with descriptions of new species. Annali del Museo Civico di Storia Naturale “G. Doria” 99:1-191.
  • Bolton, B. 1999. Ant genera of the tribe Dacetonini (Hymenoptera: Formicidae). J. Nat. Hist. 3 33: 1639-1689 (page 1672, Combination in Pyramica)
  • Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028. (page 190, redescription of worker)
  • Brown, W. L., Jr. 1959b. A revision of the dacetine ant genus Neostruma. Breviora 107: 1-13 PDF (page 11, fig. 2 queen described)
  • Kempf, W. W. 1975a [1974]. Report on Neotropical Dacetine ant studies (Hymenoptera: Formicidae). Rev. Bras. Biol. 34: 411-424 (page 417, worker described)