Strumigenys admixta

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

Strumigenys admixta casent0005468 profile 1.jpg

Strumigenys admixta casent0005468 dorsal 1.jpg

Specimen labels

This species has been found in a range of forest habitats and sampled from leaf litter, rotten wood, and under a stone.

Identification

Bolton (2000) - A member of the sphera complex in the Strumigenys arnoldi-group. S. admixta can be isolated from other members of the sphera-complex by the following characters:

1 Upper scrobe margin with a projecting lamellate flange throughout its length.

2 Basal half of scape distinctly and sharply swollen; in dorsal view maximum width of scape about twice its apical width.

Keys including this Species

Distribution

Latitudinal Distribution Pattern

Latitudinal Range: -15.66667° to -15.66667°.

 
North
Temperate
North
Subtropical
Tropical South
Subtropical
South
Temperate

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

Countries Occupied

Number of countries occupied by this species based on AntWiki Regional Taxon Lists. In general, fewer countries occupied indicates a narrower range, while more countries indicates a more widespread species.
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Estimated Abundance

Relative abundance based on number of AntMaps records per species (this species within the purple bar). Fewer records (to the left) indicates a less abundant/encountered species while more records (to the right) indicates more abundant/encountered species.
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Biology

Castes

Worker

Images from AntWeb

Strumigenys admixta casent0005469 head 1.jpgStrumigenys admixta casent0005469 profile 1.jpgStrumigenys admixta casent0005469 dorsal 1.jpgStrumigenys admixta casent0005469 label 1.jpg
Paratype of Strumigenys admixtaWorker. Specimen code casent0005469. Photographer April Nobile, uploaded by California Academy of Sciences. Owned by CAS, San Francisco, CA, USA.
Strumigenys admixta casent0005470 head 1.jpgStrumigenys admixta casent0005470 profile 1.jpgStrumigenys admixta casent0005470 dorsal 1.jpgStrumigenys admixta casent0005470 label 1.jpg
Paratype of Strumigenys admixtaWorker. Specimen code casent0005470. Photographer April Nobile, uploaded by California Academy of Sciences. Owned by CAS, San Francisco, CA, USA.
Strumigenys admixta casent0005471 head 1.jpgStrumigenys admixta casent0005471 dorsal 1.jpgStrumigenys admixta casent0005471 label 1.jpg
Holotype of Strumigenys admixtaWorker. Specimen code casent0005471. Photographer April Nobile, uploaded by California Academy of Sciences. Owned by MCZ, Cambridge, MA, USA.
Strumigenys admixta casent0069921 head 1.jpgStrumigenys admixta casent0069921 head 2.jpgStrumigenys admixta casent0069921 profile 1.jpgStrumigenys admixta casent0069921 dorsal 1.jpgStrumigenys admixta casent0069921 label 1.jpg
Worker. Specimen code casent0069921. Photographer April Nobile, uploaded by California Academy of Sciences. Owned by CAS, San Francisco, CA, USA.

Nomenclature

The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.

  • admixta. Strumigenys admixta Fisher, in Bolton, 2000: 658 (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 2.5, HL 0.65, HW 0.58, CI 90, ML 0.32, MI 49, SL 0.42, SI 72, PW 0.31, AL 0.62. Characters of sphera-complex. Each mandible with 1 preapical acute tooth which is situated in the apical third of the length. Upper scrobe margin with a projecting lamellate flange throughout its length, eyes not visible in full-face view. Eye small, convex, its maximum diameter less than maximum width of scape. Basal portion of scape swollen, apical third subcylindrical; hairs on leading edge fine, narrowly spatulate. Cephalic dorsum densely clothed with small appressed scale-like ground-pilosity; upper scrobe margin fringed with short curved narrowly spatulate to spoon-shaped hairs. Cephalic dorsum with 3 pairs of stout standing remiform to clavate hairs arranged in a transverse row close to the occipital margin, and 1 pair on vertex. Pronotal humeral hair absent, the humeral angles bluntly marginate. Mesonotum with 1 pair of stout standing clavate hairs, on anterior margin. Ground-pilosity on alitrunk dorsum sparse, consisting of short narrowly spatulate to broadly spatulate (almost scale-like) hairs. Dorsum of alitrunk in outline convex anteriorly, posterior portion more or less flat to gently sloping to declivity. Metanotal groove shallowly impressed. Propodeal spines narrowly triangular, diverging; lamella absent from declivity. Alitrunk dorsum densely reticulate-punctate. Pronotal dorsum with superi mposed rugulose sculpture, most evident at lateral margins. Sides of pronotum striolate to costulate with punctate sculpture on apical margin, remainder more or less smooth. Pleurae smooth and shiny with punctures peripherally. Petiole node in dorsal view approximately as broad as long. Postpetiole disc reticulate-punctate, on some specimens faint longitudinally striolate sculpture present on lateral margins of disc. In profile ventral spongiform tissue of petiolar peduncle a narrow curtain along the base of the peduncle, depth of curtain approximately equal to maximum width of eye. Ventral spongiform lobe of postpetiole moderately developed. Basigastral costulae short but distinct. Dorsal surface of petiole with one pair of erect stout clavate hairs; postpetiole and gaster with stout standing clavate hairs. Colour light to medium brown.

Paratypes. TL 2.6-2.7, HL 0.67-0.71, HW 0.58-0.62, CI 84-91, ML 0.33-0.36, MI 49-50, SL 0.44-0.46, SI 71-78, PW 0.32-0.34, AL 0.63-0.68 (6 measured). As holotype.

Measurements of this material extend the range shown by the type-series: HL 0.64-0.69, HW 0.55-0.61, CI 82-90, ML 0.31-0.34, MI 46-52, SL 0.40-0.44, SI 70-79 (7 measured).

Type Material

Holotype worker, Madagascar: 5.3 km. SSE Ambanizana, Andranobe, 15°40'S, 49°58'E, 425 m., 21.xi.1993, sifted litter (leaf mold, rotten wood), rainforest, #926 (1)-6 (B. L. Fisher) (Museum of Comparative Zoology).

Paratypes. workers with same data as holotype but coded (10)-7, (27)-9, (28)-11, (35)-10, (40)-16. (The Natural History Museum, South African Museum).

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 658, worker described)

References based on Global Ant Biodiversity Informatics

  • Bolton, B. 2000. The Ant Tribe Dacetini. Memoirs of the American Entomological Institute 65
  • Fisher B. L. 2003. Formicidae, ants. Pp. 811-819 in: Goodman, S. M.; Benstead, J. P. (eds.) 2003. The natural history of Madagascar. Chicago: University of Chicago Press, xxi + 1709 pp.