Strumigenys gyrogenys

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

Strumigenys gyrogenys casent0900752 p 1 high.jpg

Strumigenys gyrogenys casent0900752 d 1 high.jpg

Specimen Labels

Collected in rainforest and a limestone forest.

Identification

Bolton (2000) - A member of the Strumigenys chapmani-group. S. gyrogenys is obviously a very close sibling of Strumigenys rotogenys, and I am not sure that I have made the right decision in separating the two. However, much material of rotogenys is available, is consistent in its diagnostics, and consistently differs from the admittedly few specimens of the rarer gyrogenys that are currently available. The validity of the latter name can be re-tested if ever good series are collected, but for the present there are no intermediates.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

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


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.

  • gyrogenys. Strumigenys gyrogenys Bolton, 2000: 768 (w.) BORNEO.

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 3.4, HL 0.99, HW 0.98, CI 99, ML 0.56, MI 57, SL 0.50, SI 51, PW 0.36, AL 0.80. Very closely related to rotogenys and answering the description of that species, but with mandibles that are longer and more slender, and with a relatively longer apicodorsal fork tooth. The two differ as follows.

S. gyrogenys: Mandibles relatively longer, MI 56-57. Mandible somewhat more slender, its maximum width 0.14 X ML. Apicodorsal tooth of mandible longer and narrower, length from j unction with inner margin of mandible to apex 2.80-3.10 X maximum width of mandible. With mandibles fully closed the upper apicodorsal tooth of the overlapping pair with the apical half or more of its length projecting beyond the outer margin of the opposing lower mandible.

S. rotogenys: Mandibles relatively shorter, MI 45-51. Mandible somewhat broader, its maximum width 0.18 X ML. Apicodorsal tooth of mandible shorter and stouter, length from junction with inner margin of mandible to apex 2.00-2.25 X maximum width of mandible. With mandibles fully closed the upper apicodorsal tooth of the overlapping pair with the apical one-quarter or less of its length projecting beyond the outer margin of the opposing lower mandible.

Paratypes. TL 3.3-3.5, HL 0.90-1.00, HW 0.88-0.98, CI 95-99, ML 0.50-0.57, MI 56-57, SL 0.46-0.52, SI 52-54, PW 0.32-0.36, AL 0.78-0.82 (3 measured).

Type Material

Holotype worker, Malaysia: Sarawak, 4th Div., Gn. Mulu N. P., 200 m., 8.vi.1978, limestone forest, pitfall trap (H. Vallack) (The Natural History Museum).

Paratypes. 1 worker with same locality as holotype but 14.iii.1978, limestone forest, leaf litter (H. Vallack); 1 worker with same locality as holotype but v-viii.1978, BM 1978-49, base camp (P. M. Hammond & J.E. Marshall); 1 worker Sarawak, 4th Div., G. Mulu Nat. Pk, RGS Expd., Long Pala, 6.x.1977, leaf litter, lowland rainforest (B. Bolton) (BMNH, Museum of Comparative Zoology).

References

  • Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028. (page 768, worker described)