Strumigenys themis

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

Strumigenys themis casent0900116 p 1 high.jpg

Strumigenys themis casent0900116 d 1 high.jpg

Specimen Labels

The two collections of this species are from rainforest, with one noted as being found in a rotten log.

Identification

Bolton (2000) - A member of the Strumigenys capitata-group. Characters differentiating themis and Strumigenys tethys are discussed under the latter name. Strumigenys charybdis is slightly smaller than themis, with relatively shorter mandibles (compare measurements) and much larger and more extensive spongiform appendages on the waist segments, as noted under charybdis.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Indo-Australian Region: Indonesia, New Guinea (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.

  • themis. Pyramica themis Bolton, 2000: 407 (w.) NEW GUINEA. Combination in Strumigenys: Baroni Urbani & De Andrade, 2007: 129

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 2.3, HL 0.56, HW 0.48, CI 86, ML 0.14, MI 25, SL 0.27, SI 56, PW 0.34, AL 0.66. Apicoscrobal and pronotal humeral hairs stout, thickened or weakly remiform apically. Eye with 4 ommatidia in the longest row. Dorsum of head with a transverse row of 4 standing hairs close to the occipital margin and with a pair of similar hairs just in front of the highest point of the vertex. Head and alitrunk reticulate-punctate almost everywhere, only the mesopleuron smooth and the anterior portion of the metapleuron with reduced punctation. Mesonotum with two pairs of short, remiform to weakly clavate standing hairs. Dorsal outline of propodeum in profile markedly convex between metanotal groove and teeth. With petiole in profile the dorsum with two pairs of standing hairs and the height of the anterior face of the node slightly less than the length of the dorsum (discounting the posterior collar). Spongiform appendages of waist segments small. Lateral lobe of petiole a mere angular flange that is no broader than the posterior collar. Ventral spongiform lobe of postpetiole in profile much smaller than the exposed cuticular area of the disc. Petiole node in dorsal view reticulate-punctate, slightly narrower than the postpetiole disc and not bordered laterally by extensive projecting lobes of spongiform tissue. Disc of postpetiole smooth or with faint traces of vestigial sculpture. Anterior and posterior collars present on postpetiole dorsum and with spongiform lobes extending from the posterolateral angles, but the remainder of the sides without projecting spongiform tissue.

Paratypes. TL 2.2-2.3, HL 0.53-0.56, HW 0.45-0.49, CI 85-89, ML 0.13-0.16, MI 25-29, SL 0.26-0.28, SI 55-60, PW 0.33-0.34, AL 0.60-0.68 (9 measured).

Type Material

Holotype worker, Papua New Guinea: Bubia, 13 km. NW Lae, 18-19.v.1955, no. 1063, lowland rainforest (E. O. Wilson) (Museum of Comparative Zoology).

Paratypes. 9 workers with same data as holotype (MCZ, 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 408, worker described)