Strumigenys guttulata

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Strumigenys guttulata
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Strumigenys
Species: S. guttulata
Binomial name
Strumigenys guttulata
Forel, 1902

Strumigenys guttulata casent0900923 p 1 high.jpg

Strumigenys guttulata casent0900923 d 1 high.jpg

Specimen Labels

Known from the central coastal region of Queensland. One collection was made from a nest under a rock. Another was from the litter in a lowland rainforest.

Identification

Bolton (2000) - A member of the horvathi complex in the Strumigenys horvathi-group. Easily distinguished from members of the emdeni-complex as guttulata has a much broader mandibular lamella and a shallow and poorly defined posterior portion to the scrobe.

The ANIC material of guttulata contains two queens that appear to belong to this species. Although probably correctly associated I reserve some doubt, because the queens have apicoscrobal and pronotal humeral hairs present, features that are absent from the workers. Humeral hairs occur in workers only in a New Guinean species of this complex, Strumigenys snellingi. The queen of this species remains unknown and workers referable to snellingi have not been found in Australia.

The Malesian Strumigenys horvathi is very closely related to guttulata and the two may eventually prove to be inseparable. However, samples currently assigned to horvathi differ from guttulata by having a smooth patch on the katepisternum and a postpetiole disc that is unsculptured or at most weakly shagreenate.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Australasian Region: Australia (type locality).

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Castes

Nomenclature

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

  • guttulata. Strumigenys guttulata Forel, 1902h: 458 (w.) AUSTRALIA. See also: Brown, 1973c: 264; Bolton, 2000: 975.

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 2.3-2.8, HL 0.65-0.77, HW 0.47-0.59, CI 69-78, ML 0.22-0.26, MI 32-36, SL 0.29-0.40, SI 60-70, PW 0.25-0.32, AL 0.62-0.77 (20 measured).

Characters of horvathi-complex. Inner margin of mandible with a broad translucent cuticular lamella that commences at mandible base and is abruptly truncated just proximal of the curved-spiniform preapical tooth; maximum width of lamella nearly equal to length of preapical tooth. When mandibles fully closed inner margins of lamellae meet or even slightly overlap. Outer curvature of eyes visible in full-face view, not concealed by upper scrobe margins. Ventrolateral margin of head in front of eye evenly and quite distinctly concave (but without a preocular notch such as is seen in Strumigenys mayri and its allies), the concavity masked in full-face view by the preocular carina. With head in profile the scrobe weak behind the level of the eye, shallow, poorly defined and without sharp margins. Dorsal surfaces of head and promesonotum densely clothed with orbicular ground-pilosity. Posteriorly on mesonotum these hairs may be more elevated than elsewhere but there are no erect hairs anywhere on the cephalic and alitrunk dorsa. First gastral tergite with numerous erect stiff hairs that are slightly thickened or flattened apically, or weakly remiform. Dorsum of head and alitrunk reticulate-punctate but sculpture much concealed by ground-pilosity. Side of alitrunk entirely reticulate to reticulate-punctate, without a smooth area on katepisternum. Disc of postpetiole reticulate-shagreenate to reticulate-punctate.

Type Material

Bolton (2000) - Syntype workers, AUSTRALIA: Queensland, Mackay (Turner) (The Natural History Museum) [examined].

References

  • Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028. (page 975, fig. 530 redescription of worker)
  • Brown, W. L., Jr. 1973c. The Indo-Australian species of the ant genus Strumigenys: groups of horvathi, mayri and wallacei. Pac. Insects 15: 259-269 (page 264, review of worker)
  • Emery, C. 1924f [1922]. Hymenoptera. Fam. Formicidae. Subfam. Myrmicinae. [concl.]. Genera Insectorum 174C: 207-397 (page 321, catalogue)
  • Forel, A. 1902j. Fourmis nouvelles d'Australie. Rev. Suisse Zool. 10: 405-548 (page 458, worker described)
  • Shattuck, S. O. 1999. Australian ants. Their biology and identification. Collingwood, Victoria: CSIRO Publishing, xi + 226 pp. (page 168, see also)
  • Taylor, R. W.; Brown, D. R. 1985. Formicoidea. Zool. Cat. Aust. 2:1- 149: 1-149, 30 (page 88, catalogue)