Strumigenys undras

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

Strumigenys undras casent0102672 profile 1.jpg

Strumigenys undras casent0102672 dorsal 1.jpg

Specimen labels

Known from a small number of specimens. Collection details show specimens were found in litter-samples from rainforest and humid forest.


Bolton (2000) - A member of the Strumigenys biroi-group. This species is immediately distinguished from both Strumigenys biroi and Strumigenys pulchra as it lacks promesonotal sculpture, has no flagellate hairs anywhere on its body and has a normal, rather than a thick and densely spongiform, lamella on the propodeal declivity. The cephalic ground-pilosity of undras is broader and more conspicuous than in the other two species, and its promesonotal ground-pilosity hairs are very different from those seen on the head, whereas in both biroi and pulchra individual hairs of the cephalic and promesonotal ground-pilosities are similar.

Like undras, Strumigenys basiliska also has a smooth promesonotum and lacks flagellate hairs, but in the latter there is no propodeal lamella, the head is not reticulate-punctate and lacks flattened broad hairs, standing hairs are present on the mesonotum and first gastral tergite and the lateral lobe on the petiole node is much longer.

Keys including this Species


Distribution based on Regional Taxon Lists

Australasian Region: Australia.
Indo-Australian Region: Indonesia (type locality), New Guinea, Solomon Islands.

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb




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

  • undras. Strumigenys undras Bolton, 2000: 752, fig. 517 (w.q.) INDONESIA (Aru I.)

Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.



Holotype. TL 2.1, HL 0.58, HW 0.43, CI 74, ML 0.16, MI 28, SL 0.27, SI 63, PW 0.25, AL 0.60. Dorsolateral margin of head with a closely applied row of broadly spatulate to spoon-shaped hairs, without freely laterally projecting hairs anywhere on margin. Cephalic dorsum finely and densely reticulate-punctate, the sculpture to some extent obscured by dense appressed very broadly spatulate ground-pilosity. Pronotal humeral hair absent; mesonotum without erect hairs. Ground-pilosity on promesonotum of a few scattered minute appressed hairs, much smaller, sparser and more slender than on head. Entire dorsum of alitrunk smooth and shining, contrasting strongly with the head. Side of alitrunk entirely unsculptured, smooth. Propodeum with teeth that are subtended on the declivity by lamellae, the latter not thickly spongiform. In dorsal view the propodeum terminates in the teeth, not in a pair of posteriorly directed thick spongiform lobes. Dorsal (outer) surfaces of middle and hind basitarsi without erect flagellate hairs. With petiole in profile the lateral spongiform lobe confined to the posterior portion of the node. Disc of postpetiole smooth and shining. Dorsum of petiole node and its dorsolateral margins, sides and posterior margin of postpetiole disc, and surface of limbus, all with broadly spatulate appressed hairs; those on waist segments directed posteriorly but those on limbus directed anteriorly. Standing hairs absent from first gastral tergite.

Paratypes. TL 2.1, HL 0.57-0.60, 0.43-0.45, CI 74-76, ML 0.16-0.18, MI 28-31, SL 0.26-0.28, SI 60-65, PW 0.25-0.27, AL 0.60-0.61 (5 measured).

Type Material

Holotype worker (top specimen of two on pin), Indonesia: Aru I., Kola, Wafam, 50 m., humid forest leaf litter #2, F911202, 5.32°S, 143.40°E, 27.viii.1991 (D. Agosti) (Musee d'Histoire Naturelle Genève).

Paratypes. 7 workers and 1 queen with same data as holotype (MHNG, The Natural History Museum).

Type Material


  • Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028. (page 752, worker described)