Strumigenys biroi

AntWiki - Where Ant Biologists Share Their Knowledge
Jump to: navigation, search
Strumigenys biroi
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Strumigenys
Species: S. biroi
Binomial name
Strumigenys biroi
Emery, 1897

Strumigenys biroi casent0280753 p 1 high.jpg

Strumigenys biroi casent0280753 d 1 high.jpg

Specimen Labels

Label data from two collected note the ants were collected in rainforest from a litter sample.

Identification

Bolton (2000) - A member of the Strumigenys biroi-group. There may be two sibling species concealed under this name as some individuals have the propodeal dorsum smooth whilst in others there is punctate sculpture present.

S. biroi is closest related to Strumigenys pulchra, the two are only separated on the details of sculpture noted below. The two together are easily distinguished from Strumigenys basiliska and Strumigenys undras as both of these have an unsculptured promesonotum and lack flagellate hairs at the pronotal humeri and on the basitarsi.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Indo-Australian Region: Indonesia, New Guinea (type locality).

Distribution based on specimens

Loading map...

The above specimen data are provided by AntWeb. Please see Strumigenys biroi for further details

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.

  • biroi. Strumigenys biroi Emery, 1897c: 580, pl. 14, fig. 16 (w.) NEW GUINEA. See also: Bolton, 2000: 751.

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 1.9-2.0, HL 0.48-0.52, HW 0.37-0.40, CI 75-81, ML 0.14-0.16, MI 28-32, SL 0.23-0.25, SI 60-65, PW 0.22-0.25, AL 0.53-0.60 (10 measured).

Dorsolateral margin of head with a closely applied row of spatulate hairs, without freely laterally projecting hairs anywhere on margin. Cephalic dorsum with conspicuous narrowly spatulate ground-pilosity that is closely applied to the surface. Pronotal humeral hair flagellate; mesonotum with a single pair of erect flagellate hairs. Ground-pilosity on promesonotum as on head but not as dense. Dorsum of head and promesonotum densely reticulate-punctate. Pleurae and side of propodeum smooth and shining. Propodeum without trace of cuticular teeth, instead the declivity with a thickly spongiform broad lamella that extends its entire depth. In dorsal view the propodeum terminates in a pair of posteriorly directed thick spongiform lobes, the apices of the lamellae. Dorsal (outer) surface of each middle and hind basitarsus with a single long flagellate erect hair. Disc of postpetiole mostly to entirely smooth, at most with a few very short and feeble costulae at extreme anterior margin. Hairs on first gastral tergite extremely sparse; 2-4 inconspicuous fine hairs present at base that are inclined anteriorly toward the limbus. Tergite otherwise without standing hairs although very sparse minute appressed pubescence is present. Basigastral costulae short, their length on the tergite proper no greater than their length on the limbus.

Type Material

Bolton (2000) - Syntype workers, PAPUA NEW GUINEA: Madang (=Friedrich-Wilhelmshafen), and Aitape (= Berlinhafen) (L. Biro) (Hungarian Natural History Museum) [examined].

References