Strumigenys friedae

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Strumigenys friedae
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Strumigenys
Species: S. friedae
Binomial name
Strumigenys friedae
Forel, 1915

Strumigenys friedae casent0217951 p 1 high.jpg

Strumigenys friedae casent0217951 d 1 high.jpg

Specimen Labels

Known from various mesic forest habitats, specimens have been collected from a rotten log and litter samples.

Identification

Bolton (2000) - A member of the smythiesii complex in the Strumigenys godeffroyi-group. Of the eight Austral species in the smythiesii-complex Strumigenys harpyia and Strumigenys zygon are the smallest and have the shortest scapes. Their combined dimensions of HL 0.44-0.50, SI 70-80 compare with a range of HL 0.57-0.72, SI 80-100 for Strumigenys alexetrix, Strumigenys belua, Strumigenys mesedsura, Strumigenys friedae, Strumigenys segrex and Strumigenys tisisyx together. S. zygon is unique in the complex as it has two freely laterally projecting hairs on each upper scrobe margin and characteristic gastral pilosity. Of the remainder only harpyia and alexetrix have standing hairs on the pronotal dorsum (other than the flagellate humeral hairs) but these two are easily separated on details of size and sculpture.

S. belua is immediately isolated by its strong mesonotal median carina and unique propodeum that possesses a vertical low cuticular lamina on each dorsolateral margin. This species also falls between harpyia and the remainder of the complex in terms of size, having HL 0.57, compared to HL 0.61-0.72 in the other species together.

In alexetrix and tisisyx the mesopleuron, metapleuron and side of the propodeum are entirely reticulate-punctate, whereas in friedae, mesedsura and segrex these sclerites are largely or entirely unsculptured. S. alexetrix, apart from the presence of standing hairs on the pronotum and slender linear-spatulate ground-pilosity on the head, has scapes that are notably shorter (SI 80-83) than in tisisyx (SI 93-100); cephalic ground-pilosity in the latter is conspicuous, short and broadly spatulate.

S. friedae, mesedsura and segrex are similar in size though the first two tend to have relatively slightly shorter scapes and longer mandibles than segrex (SI 87-96, MI 45-52 as opposed to SI 96-100, MI 41-43). The separation of friedae and segrex is simple: in friedae the pronotal dorsum is densely reticulate-punctate, the head lacks a pair of erect flagellate hairs at the highest point of the vertex and the ventral curtain of the petiole is deep and thickly spongiform. By contrast segrex has sculpture on the pronotal dorsum almost entirely effaced, has a pair of erect flagellate hairs at the highest point of the vertex and has the ventral curtain of the petiole shallow, laminate or lace-like.

S. mesedsura differs from both of these as its propodeal lamella is broad and forms a large projecting lobe below the level of the spiracle. Like segrex it has reduced sculpture on the pronotal dorsum but does not have erect flagellate hairs at the highest point of the vertex. Like friedae it has a spongiform ventral curtain on the postpetiole but lacks the even regular sculpture on the dorsal pronotum.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Australasian Region: Australia (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.

  • friedae. Strumigenys friedae Forel, 1915b: 42 (w.q.) AUSTRALIA. Imai, Crozier & Taylor, 1977: 349 (k.). See also: Bolton, 2000: 959.

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

Description

Worker

Bolton (2000) - TL 2.4-2.8, HL 0.61-0.69, HW 0.41-0.46, CI 66-70, ML 0.28-0.36, MI 45-52, SL 0.36-0.45, SI 87-96, PW 0.26-0.30, AL 0.66-0.73 (25 measured).

With characters of smythiesii-complex. Apicoscrobal hair flagellate. Cephalic dorsum sharply reticulate-punctate and with narrowly spatulate ground-pilosity. A single pair of erect fine hairs on cephalic dorsum, located close to midline near occipital margin; these hairs subflagellate, curved anteriorly or looped. Occipital margin closer to occipital corners often with 1-2 shorter stiffer simple standing hairs on each side. Eye of moderate size, with less than 20 ommatidia in total. Pronotal humeral hair flagellate; pronotal dorsum otherwise without standing hairs. Mesonotum with a single pair of erect flagellate hairs. Entire dorsal alitrunk finely and densely reticulate-punctate. Propodeal declivity with posterior (free) margin of lamella more or less straight to shallowly concave. Katepisternum mostly to entirely smooth. Metapleuron and side of propodeum at least with a smooth patch that covers the upper portion of the former and lower portion of the latter; often more extensive. Dorsum of petiole node finely reticulate-punctate; disc of postpetiole mostly smooth but usually with some weak punctulation on the lateral and posterior margins. Hairs on first gastral tergite long and fine, flagellate.

Type Material

Bolton (2000) - Syntype workers and queen, AUSTRALIA: Queensland, Malanda (E. Mjoberg) (Musee d'Histoire Naturelle Genève) [examined].

References

  • Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028. (page 959, figs. 527, 544 worker described)
  • Emery, C. 1924f [1922]. Hymenoptera. Fam. Formicidae. Subfam. Myrmicinae. [concl.]. Genera Insectorum 174C: 207-397 (page 321, catalogue)
  • Forel, A. 1915b. Results of Dr. E. Mjöbergs Swedish Scientific Expeditions to Australia 1910-13. 2. Ameisen. Ark. Zool. 9(1 16: 1-119 (page 42, worker, queen described)