Strumigenys serradens

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

Strumigenys serradens casent0900106 p 1 high.jpg

Strumigenys serradens casent0900106 d 1 high.jpg

Specimen Labels\

Known from the type series, a collection taken from a rotten log in a rainforest.

Identification

Bolton (2000) - A member of the Strumigenys capitata-group. Apart from the characters listed above the alitrunk of serradens is more finely sculptured, with the dense reticulate-punctate component emphasised and the rugular component very much diminished when compared to Strumigenys serraformis, where the rugular component is conspicuous.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Indo-Australian Region: Philippines (type locality).

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

Worker

Nomenclature

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

  • serradens. Pyramica serradens Bolton, 2000: 404 (w.) PHILIPPINES. Combination in Strumigenys: Baroni Urbani & De Andrade, 2007: 127

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

Description

Worker

Holotype. TL 4.0, HL 0.86, HW 0.72, CI 84, ML 0.28, MI 33, SL 0.46, SI 64, PW 0.56, AL 1.16. Answering the description of the closely related serraformis but differing as follows.

1 Vertex densely sharply reticulate-punctate and with fine rugulose sculpture toward the sides (rugulae not equally dense on centre of vertex as in serraformis).

2 Mesonotum with a single pair of standing hairs (caution, available specimens may be abraded).

3 Petiole in profile without a differentiated anterior face to the node.

4 Disc of postpetiole covered everywhere with uniformly dense sharply defined reticulate-punctate sculpture.

5 Basigastral costulae at least as long as the postpetiole disc.

6 Dorsum of first gastral tergite smooth and shining behind level of basigastral costulae.

7 First gastral sternite smooth everywhere except for hair pits.

Paratypes. TL 3.9-4.2, HL 0.84-0.86, HW 0.72-0.76, CI 84-88, ML 0.28-0.30, MI 33-34, SL 0.46-0.48, SI 62-65, PW 0.54-0.58, AL 1.10-1.24 (5 measured). All paratypes show signs of abrasion, with loss of hairs here and there.

Type Material

Holotype worker, Philippines: Luzon, Los Banos, Mt Makiling, 14°10'N, 121°11'E, 21.ix.1978, 800 m., rainforest, in rotten log, ANIC Ants vial 33.188 (B. B. Lowery) (Australian National Insect Collection).

Paratypes. 5 workers with same data as holotype (ANIC, The Natural History Museum).

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. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028. (page 404, worker described)