Strumigenys yaleopleura

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Strumigenys yaleopleura
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Strumigenys
Species: S. yaleopleura
Binomial name
Strumigenys yaleopleura
Brown, 1988

Strumigenys yaleopleura casent0900854 p 1 high.jpg

Strumigenys yaleopleura casent0900854 d 1 high.jpg

Specimen Labels

Specimens have been collected from rainforest, most from litter samples. One is noted as collected from under a stone.

Identification

Bolton (2000) - A member of the Strumigenys yaleopleura-group. The mandibles and scapes of yaleopleura tend to average slightly longer (MI 33-35, SI 63-69) than in the other two Malesian species of the group (MI 30-33, SI 55-61), and the mandibles of yaleopleura are broader basally, less strongly bowed outwards and more strongly tapered from base to apex than in either Strumigenys dantalion or Strumigenys furfara. The distribution of flagellate hairs on the middle and hind legs of yaleopleura, with 2 on each tibia and 2 on each basitarsus, is unique in Malesian species of the group, but care should be taken with this character as these hairs are easily abraded. The lamella of the propodeal declivity is very narrow and insignificant in both dantalion and furfara, broad and distinct in yaleopleura. Apart from this dantalion has only a single flagellate hair on the dorsolateral margin of the head, the apicoscrobal, and its pronotum has flagellate hairs only at the humeri. Both furfara and dantalion lack flagellate hairs on the dorsal (outer) surfaces of the middle and hind tibiae. For differentiation of yaleopleura from the Australian endemic species of this group see under the Austral fauna.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

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

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Strumigenys were once thought to be rare. The development and increased use of litter sampling methods has led to the discovery of a tremendous diversity of species. Many species are specialized predators (e.g. see Strumigenys membranifera and Strumigenys louisianae). Collembola (springtails) and other tiny soil arthropods are typically favored prey. Species with long linear mandibles employ trap-jaws to sieze their stalked prey (see Dacetine trap-jaws). Larvae feed directly on insect prey brought to them by workers. Trophallaxis is rarely practiced. Most species live in the soil, leaf litter, decaying wood or opportunistically move into inhabitable cavities on or under the soil. Colonies are small, typically less than 100 individuals but in some species many hundreds. Moist warm habitats and micro-habitats are preferred. A few better known tramp and otherwise widely ranging species tolerate drier conditions. Foraging is often in the leaf litter and humus. Workers of many species rarely venture above ground or into exposed, open areas. Individuals are typically small, slow moving and cryptic in coloration. When disturbed individuals freeze and remain motionless. Males are not known for a large majority of species.

Castes

Nomenclature

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

  • yaleopleura. Strumigenys yaleopleura Brown, 1988e: 41 (w.q.) AUSTRALIA. See also: Bolton, 2000: 914.

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 1.7-1.9, HL 0.42-0.49, HW 0.32-0.38, CI 73-78, ML 0.14-0.18, MI 33-39, SL 0.21-0.24, SI 63-69, PW 0.20-0.22, AL 0.45-0.50 (27 measured).

Dorsolateral margin of head with a freely laterally projecting flagellate hair at level of eye and another in apicoscrobal position; a third is present posterior to this on dorsolateral margin of occipital lobe but this hair may be directed more vertically than laterally. Pronotal dorsum with a pair of flagellate hairs in addition to humeral pair. Pleurae and side of propodeum smooth. Basitarsus of hind leg with 2 long fine erect flagellate hairs on its dorsal (outer) surface and two similar hairs on dorsal (outer) surface of hind tibia; this pilosity also present on middle leg. Propodeal declivity with a distinct lamella, the lamella subtending two-thirds or more of length of tooth and its posterior (free) margin straight to extremely feebly concave. Disc of postpetiole smooth but some samples with a few very short longitudinal costulae immediately behind its anterior border.

Type Material

Bolton (2000) - Holotype worker, AUSTRALIA: Queensland, Atherton Tableland, Malanda, 800 m., 5.xi.1950, in rotten root (W. L. Brown); paratype workers and queens, AUSTRALIA: Queensland, Kuranda, 350 m., 30.x.1950 (W. L. Brown); Qld, 10 miles from Atherton on Herberton Rd, 13.vi.1962, no. 1561 (R. W. Taylor); Iron Range, 14.vi.1971, ANIC 312 (Taylor & Feehan); Rocky River, NE of Coen, 1.vi.1958 (P. F. & P. J. Darlington) (Museum of Comparative Zoology, Australian National Insect Collection, The Natural History Museum) [examined].

References