Strumigenys doriae

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

Strumigenys doriae casent0217948 p 1 high.jpg

Strumigenys doriae casent0217948 d 1 high.jpg

Specimen Labels

Strumigenys doriae group

Synonyms

Known from savanna and rainforest litter samples.

Identification

Bolton (2000) - A member of the doriae complex in the Strumigenys doriae-group. The three species of the magnifica complex (Strumigenys gloriosa, Strumigenys magnifica, Strumigenys superba), as well as having the mandibular apex as described above, are also the most luxuriantly hairy in the group, their main pilosity being much longer and more widely distributed than elsewhere. In species of the doriae-complex the pilosity, although about as dense as in the magnifica-complex, is nowhere near as long.

Within the doriae-complex two species, Strumigenys bryanti and Strumigenys hekate, have the lateral spongiform lobe of the petiole node relatively small. In profile or in dorsal view the lobe is more or less restricted to the posterior portion of the side of the node. In all other species the lobe is long, extending as far forward as the spiracle on the peduncle.

The final two species, Strumigenys doriae and Strumigenys mirifica, combine both narrow apical fork and long lateral petiolar lobe. They are easily separated as the latter has a small but distinct triangular preapical tooth on each mandible and lacks erect hairs on the anterior half of the cephalic dorsum.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Indo-Australian Region: Borneo, Indonesia (type locality), Malaysia.
Oriental Region: Thailand.


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

Worker

Queen

Nomenclature

The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.

  • doriae. Strumigenys doriae Emery, 1887b: 469, pl. 2, fig. 22 (w.) INDONESIA (Ambon I.). Imai, Kubota, et al. 1985: 47 (k.). Senior synonym of ulcerosa: Bolton, 2000: 774. See also: Brown, 1954f: 166.
  • ulcerosa. Strumigenys ulcerosa Brown, 1954f: 162 (w.) INDONESIA (Sumba I.). Junior synonym of doriae: Bolton, 2000: 774.

Type Material

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 3.5-3.9, HL 0.94-l.11, HW 0.62-0.77, CI 66-74, ML 0.48-0.58, MI 49-54, SL 0.56-0.70, SI 86-97, PW 0.34-0.42, AL 0.96-l.14 (12 measured).

Mandible without trace of preapical dentition. In anterior view apical fork of mandible forming a V-shape or very narrow-based U-shape. Propodeal teeth usually invisible in profile, either fully embedded in, or replaced by, spongiform tissue. Lateral spongiform lobe of petiole long, tapering anteriorly in dorsal view or in profile, but extending forward to the level of the spiracle on the peduncle. Postpetiole finely and densely reticulate-punctate.

Dorsolateral margin of head with 5 or more long fine hairs and a number of shorter simple hairs that freely project laterally; apicoscrobal hair usually slightly longer than any of the other main projecting hairs, its length about 0.50 X SL. With head in profile the longest erect hairs that arise from the dorsum in front of the highest point of the vertex are shorter than the longest hairs that arise between the highest point and the occipital margin; the longest of these is shorter than the maximum depth of the head capsule. Longest hairs on first gastral tergite shorter than length of tergite from base of limbus to apex and usually less than the maximum depth of the first gastral segment in profile.

Karyotype

  • 2n = 22 (Indonesia) (Imai et al., 1985).

References

  • Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028. (page 774, fig. 506 redescription of worker)
  • Brown, W. L., Jr. 1954f [1953]. The Indo-Australian species of the ant genus Strumigenys Fr. Smith: group of doriae Emery. Psyche (Camb.) 60: 160-166 (page 166, review of species)
  • Emery, C. 1887h. Catalogo delle formiche esistenti nelle collezioni del Museo Civico di Genova. Parte terza. Formiche della regione Indo-Malese e dell'Australia (continuazione e fine). [concl.]. Ann. Mus. Civ. Stor. Nat. 25[=(2)(5): 465-473 (page 469, pl. 2, fig. 22 worker described)
  • Imai, H. T.; Kubota, M.; Brown, W. L., Jr.; Ihara, M.; Tohari, M.; Pranata, R. I. 1985. Chromosome observations on tropical ants from Indonesia. Annu. Rep. Natl. Inst. Genet. Jpn. 35: 46-48 (page 47, karyotype described)