Strumigenys segrex

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

Strumigenys segrex casent0900899 p 1 high.jpg

Strumigenys segrex casent0900899 d 1 high.jpg

Specimen Labels

Known from a few open Eucalyptus forest collections, from the soil under stones. One collection was taken from within a Bothroponera nest.


Bolton (2000) - A member of the smythiesii complex in the Strumigenys godeffroyi-group. This is the only species of the Austral smythiesii-complex to possess two pairs of erect flagellate hairs on the cephalic dorsum. See also notes under Strumigenys friedae.

Keys including this Species


Distribution based on Regional Taxon Lists

Australasian Region: Australia (type locality).

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.

  • segrex. Strumigenys segrex Bolton, 2000: 969 (w.) AUSTRALIA.

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



Holotype. TL 3.0, HL 0.70, HW 0.45, CI 64, ML 0.29, MI 41, SL 0.45, SI 100, PW 0.30, AL 0.79. With characters of smythiesii-complex. Apicoscrobal hair flagellate, long and straggly. Cephalic dorsum sharply reticulate-punctate. Two pairs of erect long fine hairs present on cephalic dorsum, curved or angled anteriorly; one pair located close to midline near occipital margin, the other just in front of the highest point of the vertex. Eye with 20 or more ommatidia. Pronotal humeral hair flagellate, very long and fine; pronotum otherwise without erect hairs. Mesonotum with a single pair of erect flagellate hairs. Pronotal dorsum almost smooth, sculpture almost entirely effaced, with only superficial vestiges apparent. Mesonotal and propodeal dorsa finely reticulate-punctate. Propodeal declivity with a narrow lamella, its posterior (free) margin straight or nearly so. Side of pronotum with a smooth patch; katepisternum smooth, metapleuron and side of propodeum mostly smooth. Dorsum of petiole node finely reticulate-punctate; disc of postpetiole smooth. Ventral curtain of petiole fine, laminate or lace-like rather than densely spongiform. Hairs on first gastral tergite long and fine, flagellate.

Paratypes. TL 2.7-3.0, HL 0.68-0.71, HW 0.44-0.47, CI 64-67, ML 0.28-0.30, MI 41-43, SL 0.43-0.46, SI 96-100, PW 0.30-0.32, AL 0.79-0.83 (7 measured).

Type Material

Holotype worker, Australia: New South Wales, Dawson's Spring, Mt Kaputar Nat. Pk, 30°17'S, 150°10'E, 1380 m., 25.xii.1988, under stone, Eucalyptus open forest, #9755 (P. S. Ward) (Australian National Insect Collection). [Holotype is upper worker of two on pin.] Paratypes. 10 workers with same data as holotype (ANIC, The Natural History Museum, Museum of Comparative Zoology, University of California, Davis). [Some paratypes bear additional information: “in Bothroponera nest”.]

  • Holotype, worker, Dawsons Spring, Mt. Kaputar National Park, New South Wales, Australia, Ward,P.S., ANIC32-017804, Australian National Insect Collection.
  • Paratype, 1 worker, Dawsons Spring, Mt. Kaputar National Park, New South Wales, Australia, Ward,P.S., ANIC32-017805, Australian National Insect Collection.
  • Paratype, worker(s), Dawsons Spring, Mt. Kaputar National Park, New South Wales, Australia, The Natural History Museum.
  • Paratype, worker(s), Dawsons Spring, Mt. Kaputar National Park, New South Wales, Australia, Univ. of California (Davis).


  • Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028. (page 969, worker described)