Strumigenys disarmata

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Strumigenys disarmata
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Strumigenys
Species: S. disarmata
Binomial name
Strumigenys disarmata
Brown, 1971

Strumigenys disarmata casent0280736 p 1 high.jpg

Strumigenys disarmata casent0280736 d 1 high.jpg

Specimen Labels

Collected from rainforest, Strumigenys disarmata has been found in litter, rotten logs and a rotting tuber root.

Identification

Bolton (2000) - A member of the Strumigenys szalayi-group. The lack of distinctly developed propodeal teeth renders disarmata immediately recognisable within the group.

Keys including this Species

Distribution

Eastern highlands of New Guinea.

Distribution based on Regional Taxon Lists

Indo-Australian Region: New Guinea.

Distribution based on specimens

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

Biology

Castes

Nomenclature

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

  • disarmata. Strumigenys disarmata Brown, 1971c: 80, fig. 6 (w.q.) NEW GUINEA. See also: Bolton, 2000: 903.

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

Description

Worker

Holotype worker: TL 3.8, HI 0.99 HW 0.70, ML 0.57. WL 0.92, scape L 0.72 mm.; CI 71, MI 58.

Similar in form to Strumigenys szalayi and Strumigenys hemichlaena, but larger, with longer mandibles and with the following additional differences:

1. Propodeal dorsum convex posteriorly, terminating in a pair of obtuse tubercles or angles representing the reduced propodeal teeth.

2. Petiole longer and more slender, with a low, gradually rounded node (but much less extreme in this than in Strumigenys stemonixys). Basigastric costulae few and very short.

3 Color orange brown; vertex and middle of head, middle of alitrunk, and gaster more or less infuscated with darker brown; appendages, occipital lobes, anterior part of petiole and apex of gaster yellow to ferruginous-yellow.

Ten paratype workers from the type next series varied in size and proportions: TL 3.6-4.0, HL 0.96-1.02, HW 0.68-0.73, ML 0.55-0.60, WL 0.90-0.96, scape L. 0.67-0.73 mm.; CI 71-72, MI 57-59. Some workers, presumably half-callows, are lighter and more yellowish in color.

Bolton (2000) - TL 3.4-3.5, H L 0.94-1.00, HW 0.67-0.72, CI 70-72, ML 0.52-0.60, MI 55-60, SL 0.66-0.72, SI 98-103, PW 0.34-0.38, AL 0.93-0.98 (7 measured).

With head in profile the postocular concavity in the vetrolateral margin very distinct. Propodeal teeth vestigial, reduced to tiny obtuse tubercles or even reduced to mere rounded angles. Side of alitrunk reticulate-punctate except for a small unsculptured patch on katepisternum. Hairs on first gastral tergite similar to those on postpetiole. Colour a mixture of varying shades of brown to uniform dark brown with lighter legs.

Queen

The larger of two dealate females has TL 4.2, HL 1.00, HW 0.74, ML 0.57, WL 1.02, scape L 0.70 mm.; CI 74, MI 57. Propodeum with short by acute triangular teeth. Color mahogany; with central dorsum of head and dorsum of alitrunk almost black; clypeus and occipital lobes orange-brown; mandibles, antennae and legs bright ferruginous yellow.

Type Material

Holotype (Queensland Museum) with type next series of numerous workers and two dealate females (paratypes in Queensland Museum, Museum of Comparative Zoology) from Benaga, about 25 miles southwest of Aiyura, N. E. New Guinea, taken in leaf mold of Nothofagus forest (by Berlese funnel) at an altitude of about 2000 m., 12 August, 1956, T. E. Woodward.

References