Strumigenys subedentata

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Strumigenys subedentata
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Strumigenys
Species: S. subedentata
Binomial name
Strumigenys subedentata
Mayr, 1887

Pyramica subedentata casent0178121 profile 1.jpg

Pyramica subedentata casent0178121 dorsal 1.jpg

Specimen labels

Synonyms

A wet forest species that has been sampled many hundreds of times from leaf litter samples. Occurring in both Central and South America and known to be common in the better sampled region from southern Mexico to Costa Rica.

Identification

A member of the gundlachi-complex in the Strumigenys gundlachi group.

Longino (Ants of Costa Rica) - Mandibles in full-face view linear, elongate and narrow; ventral surface of petiole without spongiform tissue; leading edge of scape with freely projecting hairs, these relatively spatulate and not strongly curved; inner margin of mandible without a tooth or distinctly enlarged denticle at or near the midlength; labral lobes short, trigger hairs at apices of lobes long; outer margins of mandibles relatively straight; mandibles thick, with inner margin convex; close to the apical fork is a small preapical tooth, followed closely by 3-5 smaller denticles; ground pilosity conspicuous and abundant, particularly on head; hairs on head spoon-shaped and reclining; in profile dorsal mesosoma with 4-6 pairs of stout remiform standing hairs (in addition to those at humeri); first gastral sternite finely reticulate to reticulate-punctate at least basally. Similar to: Similar to: Strumigenys cascanteae, Strumigenys oconitrilloae, Strumigenys paniaguae, Strumigenys gundlachi, Strumigenys eggersi and Strumigenys trieces.

Longino (2006) - Intensive collecting at La Selva Biological Station and the Barva Transect has revealed a complex of five closely similar but consistently separable species related to Strumigenys subedentata. Strumigenys subedentata occurs throughout the Neotropics, usually in lowland wet to somewhat seasonal sites, in both mature and second growth forests. It is often collected in samples of litter and rotten wood from the forest floor. Strumigenys trieces occurs on the Atlantic slope of Central America from Nicaragua to Panama, from sea level to 1100 m elevation. It occurs most abundantly in mature wet forest where, like S. subedentata, it inhabits leaf litter and rotten wood on the forest floor. The three new species described here – Strumigenys oconitrilloae, Strumigenys cascanteae, and Strumigenys paniaguae – occur as a graded series of elevational specialists, with S. oconitrilloae occurring at La Selva and the 300 m site on the Barva Transect, S. cascanteae occurring at the 300 m site and at a 600 m site in the nearby Arenal National Park, and S. paniaguae occurring at the 500 m, 1100 m, and 1500 m sites on the Barva Transect. These three all show a tendency to be arboreal, nesting under bark flaps or epiphytes and rarely occurring in samples of litter and rotten wood from the forest floor. A sixth species in this complex, Strumigenys connectens (Kempf, 1958), occurs in Colombia and Ecuador.

Bolton (2000) - Within the gundlachi-complex four species (Strumigenys connectens, Strumigenys decipula, subedentata, Strumigenys trieces) share the following characters.

1 Mandibles relatively stout, MI 43 - 56. In full-face view the mandibles broaden markedly near the midlength. The inner margins are strongly convex and touch at the point of maximum convexity when the mandibles are fully closed; proximally and distally of this point the inner margins diverge, leaving distinct spaces between the mandibles.

2 Between the apicodorsal and apicoventral teeth of the apical fork are 2 - 3 minute intercalary denticles that arise from the space between the two teeth.

3 Preapical teeth or denticles are restricted to the distal third of the mandible, are 3 - 7 in number and may be conspicuous or minute and difficult to see.

4 Flagellate hairs are absent; hairs on the leading edge of the scape are coarse and broad , flattened or spoon-shaped.

5 Postpetiole is always densely reticulate-punctate.

Of the four species decipula lacks standing hairs anywhere on the dorsal surfaces of the head and alitrunk (abundant reclinate short spatulate ground-pilosity is present), and has a very broadly lobate short scape. In subedentata paired stout standing hairs are very conspicuous on the dorsal alitrunk, where 4 - 5 pairs are obvious, and at least the base of the first gastral sternite is strongly sculptured. Both connectens and trieces have a single, mesonotal, pair of standing hairs, have the first gastral sternite smooth basally, and lack a prominent lobe on the scape; the characters noted in the key will separate these two species.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Neotropical Region: Argentina, Belize, Brazil (type locality), Colombia, Costa Rica, Ecuador, French Guiana, Grenada, Guadeloupe, Guatemala, Honduras, Mexico, Nicaragua, Panama, Paraguay, Peru, Suriname, Trinidad and Tobago, Venezuela.


Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Brown (1960) - Primarily a species of the leaf litter and upper soil layers in mesic tropical forest. Nests have been found on the underside of a small log buried in leaf litter, in a small pocket in the soil, and among rotting leaves and twigs. In life, the workers are active huntresses. E. O. Wilson (unpubl. notes) kept a colony from Veracruz alive and gave them a variety of small arthropods, among which they accepted as prey entomobryoid Collembola, while ignoring over two days small millipeds, Reticulitermes nymphs, a small isopod, and an undetermined soft-bodied mite. The colonies so far found have contained from about 20 to 90 workers and one or more queens.

Longino (Ants of Costa Rica) - In Costa Rica this species appears relatively common in lowland moist to wet forest.

Castes

Nomenclature

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

  • subedentata. Strumigenys subedentata Mayr, 1887: 575 (w.) BRAZIL. Brown, 1960b: 49 (q.m.). Combination in Pyramica: Bolton, 1999: 1673; in Strumigenys: Baroni Urbani & De Andrade, 2007: 128. Senior synonym of clavata, tristani: Brown, 1960b: 48; of kiranae: Bolton, Sosa-Calvo, et al. 2008: 62. See also: Bolton, 2000: 193.
  • tristani. Strumigenys tristani Menozzi, 1931b: 273, fig. 8 (w.) COSTA RICA. Junior synonym of subedentata: Brown, 1960b: 48.
  • clavata. Strumigenys (Strumigenys) clavata Weber, 1934a: 32, fig. 8 (w.) GUATEMALA. Junior synonym of subedentata: Brown, 1960b: 48.
  • kiranae. Pyramica kiranae Makhan, 2007a: 4, figs. 7, 8 (w.) SURINAM. Junior synonym of subedentata: Bolton, Sosa-Calvo, et al. 2008: 62.

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

Description

Worker

Brown 1960 Fig 5-9

Bolton (2000) - TL 1.9-2.4, HL 0.48-0.57, HW 0.40-0.47, CI 82-87, ML 0.26-0.30, MI 49-54, SL 0.23-0.28, SI 55-60, PW 0.24-0.32, AL 0.47-0.60 (20 measured). Characters of gundlachi complex. Inner margins of mandibles strongly convex in full-face view, at full closure touching at about the midlength and diverging both proximally and distally. Apex of mandible with 2 minute intercalary denticles between apicodorsal and apicoventral teeth. Preapical denticles restricted to distal third or less of mandible, 4 – 7 (usually 5) in number and minute; distal most denticle the largest, located close to the apicodorsal tooth. Scape relatively slender, its anterior margin convex but not expanded forward into a large convex lobe; SL more than 4 times the maximum scape width. Eye moderate, with 5 - 7 ommatidia in the longest row. Metanotal groove distinct. Spongiform lobes of postpetiole small but obviously present; base of first gastral sternite usually without spongiform tissue. Apicoscrobal hair short and stout, remiform or flattened and expanded apically; a similar hair present at pronotal humerus. Dorsum of head with conspicuous curved spatulate ground-pilosity and with 2 pairs of longer, somewhat stouter, more erect hairs; one pair close to occipital margin, the other close to highest point of vertex. Promesonotal dorsum with coarse curved spatulate ground-pilosity and with 4 – 5 pairs of weakly curved stout standing hairs that are clavate or flattened and expanded apically. Entirety of head , ali trunk and waist segments reticulate-punctate; often a small clear patch on katepisternum. At least base of first gastral sternite reticulate to reticulate-punctate, frequently the sculpture more extensive. First gastral tergite reticulate, reticulate-punctate or even finely longitudinally costulate on the basal third to half; the sculpture sometimes extends to the apex of the sclerite.

Male

Brown (1960) - (taken from nest series with workers, Mixco, Guatemala): TL 2.2, HL 0.43, WL 0.65, greatest diameter of compound eye 0.20, forewing L 1.9 mm. Mandibles vestigial, not opposable, with truncate apices. Notauli indistinct. Propodeal teeth well-developed and acute. Petiole slender, with a long, low node. Gaster and mesokatepisternum smooth and shining, body otherwise densely punctulate, opaque. Fine slender erect hairs corresponding in large part to the erect hairs of worker and female, but only some of those on the alitrunk are broadened at their apices. Head blackish-brown; body ferruginous brown; mouthparts and appendages brownish-yellow.

Venation of forewing as in Smithistruma pergandei, shown in Wheeler’s "Ants," fig. 11D. Hind wing with 5 submedian hamuli. Volsella of genitalia shown in Figure.

Type Material

Syntype workers, BRAZIL: Santa Catarina (Hetsclw) (Naturhistorisches Museum Wien, Vienna, The Natural History Museum) (examined).

Strumigenys tristani Menozzi, 1931: 273, fig. 8. Syntype workers, COSTA RICA: Orijuaco (F. I. Tristan) (BMNH) (examined).

Strumigenys (Strumigenys) clavata Weber, 1934a:32, fig. 8. Syntype workers, GUATEMALA: Alta V. Paz, Cacao Trece Aguas (Schwarz & Barber) (American Museum of Natural History) (not seen).

References

References based on Global Ant Biodiversity Informatics

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