Strumigenys dyschima

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Strumigenys dyschima
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Strumigenys
Species: S. dyschima
Binomial name
Strumigenys dyschima
(Bolton, 2000)

Strumigenys dyschima casent0900138 p 1 high.jpg

Strumigenys dyschima casent0900138 d 1 high.jpg

Specimen Labels

Identification

Bolton (2000) - Closely related to the Malaysian species Strumigenys murphyi, the two are distinguished as follows.

S. dyschima: Minute species, HW 0.37. Apicodorsal tooth of mandible not overlapping outer margin of opposite mandible at full closure. Flattened hairs that project from inner margin of mandible shorter than longest preapical tooth. Small orbicular hairs on head restricted to area immediately behind clypeus. Pronotal dorsum longitudinally costulate.

S. murphyi: Larger species, HW 0.45 or more. Apicodorsal tooth of mandible strongly overlapping outer margin of opposite mandible at full closure. Flattened hairs that project from inner margin of mandible longer than longest preapical tooth. Small orbicular hairs on head present from posterior margin of clypeus to transverse crest on vertex. Pronotal dorsum reticulate-punctate.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

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

Check distribution from AntMaps.

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Check specimen data from AntWeb

Biology

Castes

Nomenclature

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

  • dyschima. Pyramica dyschima Bolton, 2000: 451, fig. 264 (w.) BORNEO. Combination in Strumigenys: Baroni Urbani & De Andrade, 2007: 119

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 0.34, HW 0.37, CI 109, ML 0.14, MI 41, SL 0.22, SI 59, PW 0.24, AL 0.40. Inner margin of mandible with a series of medially directed small flattened hairs and with 2-3 small preapical teeth; basal most preapical tooth the largest, triangular and located at about the midlength of the mandible. Apicodorsal tooth the longest and overlapping its counterpart from the opposing mandible, but not massively enlarged nor spiniform, not extending beyond the outer margin of the opposing mandible at full closure. Anterior clypeal margin with a few flattened projecting hairs, the clypeal dorsum only with minute inconspicuous ground-pilosity. Cephalic dorsum immediately behind clypeus with two arched transverse rows of small orbicular hairs, with 6 hairs in each row. There may be 2-3 minute flattened hairs immediately posterior to the second row, but orbicular hairs similar to those in the two rows are absent from head behind this level. Transverse crest of vertex conspicuous, approximately straight across most of vertex but on each side weakening and angled forward toward the anterolateral angle of the occipital lobe. S ides of occipital lobes in full-face view more or less straight, distinctly convergent posteriorly. Leading edge of scape with 6-7 small spoon-shaped hairs that are curved toward the base of the scape and decrease in size toward the scape apex. Apex of the subbasal lobe of the scape with a larger flattened anteriorly directed hair; inner margin of lobe with 2 flattened hairs that curve toward the apex of the scape. Head and alitrunk otherwise with minute inconspicuous ground-pilosity but without standing hairs of any form. Eye minute, of a single ommatidium. Head finely and densely reticulate-punctate. Pronotal dorsum with posteriorly divergent fi ne longitudinal costulae. Mesonotum in profile saddle-shaped, its dorsal outline concave medially. Sides of alitrunk more or less smooth. Petiole and postpetiole without standing hairs but first gastral tergite with short erect straight pilosity that is clavate apically. Petiole node broader than long in dorsal view, finely shagreenate and dull. Basigastral costulae short but strongly developed.

Type Material

Holotype worker, Malaysia: Sarawak, 4th Division, Gn. Mulu N. P., ii.1978, soil core, mixed dipterocarp forest (N. M. Collins) (The Natural History Museum).

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. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028. (page 451, fig. 264 worker described)