Strumigenys sauteri

Every Ant Tells a Story - And Scientists Explain Their Stories Here
Jump to navigation Jump to search
Strumigenys sauteri
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Strumigenys
Species: S. sauteri
Binomial name
Strumigenys sauteri
(Forel, 1912)

Strumigenys sauteri casent0280702 p 1 high.jpg

Strumigenys sauteri casent0280702 d 1 high.jpg

Specimen Labels

Known from a few collections, all from rainforest litter-samples. In Hong Kong it is a widespread species found in diverse habitats including grasslands, shrublands, plantations (e.g. L. confertus), urban forest remnants, secondary forest, and Feng Shui woods. Specimens were collected at elevation ranging from 19 to 630 m (Tang et al., 2019).

Identification

Bolton (2000) - A member of the Strumigenys sauteri-group. Within this group the three species sauteri, Strumigenys arges and Strumigenys brontes form a complex of closely related forms. All share the dentition described in the introduction to the group and have a characteristic clypeal shape. In full-face view the lateral margins are convex, especially in the anterior half where they curve inwards toward the anterolateral angles; the latter are narrowly rounded and project strongly forward. Between them the anterior margin proper is deeply and evenly concave. The outer margins of the fully closed mandibles intersect the anterior clypeal margin in its concave portion, just mesad of the anteriormost points of the anterolateral clypeal angles.

Of the three species arges and sauteri have the leading edge of the scape with an evenly convex shallow curvature in the basal half. In brontes the leading edge is very broad at about the basal third where it forms a strongly prominent angle, distal to which the margin is shallowly concave. S. brontes also completely lacks basigastral costulae, which in sauteri and arges are visible at least laterally on the limbus. The last two species separate quite well by their sculpture. In sauteri the metapleuron and side of the propodeum are uniformly finely punctate, whilst in arges these areas are mostly or entirely smooth and shining. Most populations of sauteri also have the mesopleuron punctate at least in part, though a few are known where this sclerite is smooth. In arges the mesopleuron always lacks punctate sculpture.

The depository of the holotype worker of sauteri was unknown for many years, and Forel’s misleading original description, in which he miscounted the number of antennal segments, did nothing to facilitate the establishment of its real identity. The rediscovery and redescription of the holotype by Brown & Boisvert (1979) fixed its identity and showed its relationship to the Japanese species Strumigenys canina. Separation of these two is discussed under the latter name.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Oriental Region: Taiwan (type locality), Thailand.
Palaearctic Region: China, Japan.

Distribution based on AntMaps

AntMapLegend.png

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.

  • sauteri. Pentastruma sauteri Forel, 1912a: 51 (w.) TAIWAN. Combination in Pyramica: Bolton, 1999: 1673; in Strumigenys: Baroni Urbani & De Andrade, 2007: 127. See also: Brown & Boisvert, 1979: 203. See also: Bolton, 2000: 464.

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

Description

Type Material

Bolton (2000) - Holotype worker, TAIWAN: Pilam (H. Sauter) (IPAL) [not seen].

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. 1999. Ant genera of the tribe Dacetonini (Hymenoptera: Formicidae). J. Nat. Hist. 3 33: 1639-1689 (page 1673, combination in Pyramica)
  • Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028. (page 464, redescription of worker)
  • Brown, W. L., Jr.; Boisvert, R. G. 1979 [1978]. The dacetine ant genus Pentastruma (Hymenoptera: Formicidae). Psyche (Camb.) 85: 201-207 (page 203, redescription of worker)
  • Emery, C. 1924f [1922]. Hymenoptera. Fam. Formicidae. Subfam. Myrmicinae. [concl.]. Genera Insectorum 174C: 207-397 (page 326, catalogue)
  • Forel, A. 1912a. H. Sauter's Formosa-Ausbeute. Formicidae (Hym.). Entomol. Mitt. 1: 45-61 (page 51, worker described)
  • Morisita, M.; Kubota, M.; Onoyama, K.; Ogata, K.; Terayama, M.; Yamauchi, K.; Sonobe, R.; Yamane, 1992. A guide for the identification of Japanese ants. III. Myrmicinae and supplement to Leptanillinae. (Hymenoptera: Formicidae). Tokyo: Myrmecological Soc (page 72, catalogue)
  • Ogata, K. 1991b. A generic synopsis of the poneroid complex of the family Formicidae (Hymenoptera). Part II. Subfamily Myrmicinae. Bull. Inst. Trop. Agric. Kyushu Univ. 14: 61-149 (page 136, catalogue)
  • Tang, K.L., Pierce, M.P., Guénard, B. 2019. Review of the genus Strumigenys (Hymenoptera, Formicidae, Myrmicinae) in Hong Kong with the description of three new species and the addition of five native and four introduced species records. ZooKeys 831: 1–48 (DOI 10.3897/zookeys.831.31515).
  • Terayama, M. 1985c. New records of some ants from the Nansei Islands, Japan. Ari 13: 8 (page 8, catalogue)
  • Terayama, M.; Kubota, S. 1989. The ant tribe Dacetini (Hymenoptera, Formicidae) of Taiwan, with descriptions of three new species. Jpn. J. Entomol. 57: 778-792 (page 790, catalogue)