Strumigenys rubigus

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

Strumigenys rubigus casent0005630 profile 1.jpg

Specimen labels

Known from the type worker, found in a rainforest rotten-log.

Identification

Bolton (2000) - A member of the scotti complex in the Strumigenys scotti-group. S. rubigus is distinguished from other species in the scotti-complex which have the dorsum of petiole node reticulate-punctate by having the following combination of characters: 1 Mesonotum with only a single pair of erect hairs, located at anterior margin; shorter decumbent hairs may be present posterior to this pair. 2 In full-face view hairs on upper scrobe margin decumbent and sharply bent at basal third, not projecting well beyond the scrobe margin. 3 Anterior half of first gastral sternite with numerous short suberect hairs.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Malagasy Region: Madagascar (type locality).


Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Castes

Nomenclature

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

  • rubigus. Strumigenys rubigus Fisher, in Bolton, 2000: 693 (w.) MADAGASCAR.

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 2.9, HL 0.63, HW 0.48, CI 76, ML 0.32, MI 50, SL 0.40, SI 83, PW 0.34, AL 0.7l. Characters of scotti-complex. Mandibles in full-face view with outer margins shallowly and evenly convex, the width gradually decreasing from near the base to the apicodorsal tooth. Upper scrobe margin evenly and shallowly convex in full-face view, not bordered by a rim or flange, the eyes visible. Maximum diameter of eye slightly smaller than maximum width of scape, with 3-4 ommatidia in longest row. Scape short and stout, shallowly and gently curved; hairs on leading edge spatulate or spoon-shaped. Cephalic dorsum densely clothed with curved narrow spatulate to spoon-shaped ground-pilosity, the upper scrobe margin fringed with hairs which are the same shape and size as those on the dorsum. Pronotal humeral hair flagellate hair (absent on left humerus of holotype). Mesonotum with 1 pair of erect clavate hairs, located at anterior margin; shorter hairs which are curved toward the midline present posterior to this pair. Propodeum with 2 pairs of short, fine, posteriorly curved hairs immediately anterior of propodeal spines. Dorsal alitrunk with ground-pilosity as on head. Dorsum of alitrunk in outline very shallowly convex anteriorly and more or less flat posteriorly; posterior portion of mesonotum only slightly depressed below the anterior margin of propodeum. Anterior mesonotum without a carina above mesothoracic spiracle. Propodeal tooth broadly triangular, lamellate, pointed apically, and subtended by a moderate lamella. Alitrunk dorsum densely reticulate-punctate. Side of alitrunk mostly with punctate sculpture, except for katepisternum which is smooth and shiny. Postpetiole disc smooth and shining. In profile the petiole with a straight ventral spongiform strip that is slightly less deep than maximum diameter of eye. Postpetiole with moderately developed ventral spongiform lobes. Basigastral costulae arising on each side of a narrow, central clear area. Dorsal surfaces of petiole, postpetiole and gaster with standing clavate to remiform hairs. First gastral sternite, including anterior half, with numerous short suberect filiform hairs. Colour light brown.

Type Material

Holotype worker, Madagascar: Provo Toamasina, F.C. Andrianantantely, 18°41.7'S, 48°48. 8'E, 530 m., 4-10.xii.1998, ex rotten log, rainforest, #49-2 (H. J. Ratsirarson) (Museum of Comparative Zoology).

References

  • Fisher, B.L. 2000. The Malagasy fauna of Strumigenys. Pp. 612-696 in: Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028. (page 693, worker described)