Strumigenys victrix

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

Pyramica victrix casent0005462 profile 1.jpg

Pyramica victrix casent0005462 dorsal 1.jpg

Specimen labels

Fairly well collected for a Strumigenys, this species has been found in litter-samples from a variety of wet forest habitats.

Identification

Bolton (2000) - A member of the Strumigenys rostrata-group. Characters differentiating victrix from Strumigenys ambatrix are listed under the latter name. S. victrix is very slightly larger than either Strumigenys fautrix or Strumigenys symmetrix (see measurements). It separates from both members of that species-pair as follows.

S. victrix: Lamella on propodeal declivity with a more or less straight free margin that does not project farther posteriorly than the apex of the propodeal tooth. Standing hairs on mesonotum narrow and acute apically. Pronotal dorsum with shallow but conspicuous reticulate-punctate ground-sculpture. Disc of postpetiole in dorsal view without spongiform tissue projecting beyond the outline of the anterolateral corners. In dorsal view the lateral margins of the postpetiole disc broadly evenly convex, not markedly convergent posteriorly.

S. fautrix and symmetrix: Lamella on propodeal declivity with a markedly convex free margin that projects farther posteriorly than the apex of the propodeal tooth. Standing hairs on mesonotum narrowly spatulate to weakly clavate apically. Pronotum with much fainter and more superficial shagreenate ground-sculpture. Disc of postpetiole in dorsal view with spongiform tissue projecting beyond the outline of the anterolateral corners . In dorsal view the lateral margins of the postpetiole disc approximately straight and markedly convergent posteriorly.

Keys including this Species

Distribution

Latitudinal Distribution Pattern

Latitudinal Range: -22.21666667° to -22.21666667°.

 
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

Template:Strumigenys

Castes

Worker

Images from AntWeb

Pyramica victrix casent0005463 head 1.jpgPyramica victrix casent0005463 profile 1.jpgPyramica victrix casent0005463 dorsal 1.jpgPyramica victrix casent0005463 label 1.jpg
Paratype of Strumigenys victrixWorker. Specimen code casent0005463. Photographer April Nobile, uploaded by California Academy of Sciences. Owned by CAS, San Francisco, CA, USA.
Pyramica victrix casent0005464 head 1.jpgPyramica victrix casent0005464 profile 1.jpgPyramica victrix casent0005464 dorsal 1.jpgPyramica victrix casent0005464 label 1.jpg
Paratype of Strumigenys victrixWorker. Specimen code casent0005464. Photographer April Nobile, uploaded by California Academy of Sciences. Owned by CAS, San Francisco, CA, USA.
Pyramica victrix casent0005987 head 1.jpgPyramica victrix casent0005987 head 2.jpgPyramica victrix casent0005987 profile 1.jpgPyramica victrix casent0005987 profile 2.jpgPyramica victrix casent0005987 dorsal 1.jpgPyramica victrix casent0005987 dorsal 2.jpgPyramica victrix casent0005987 label 1.jpg
Worker. Specimen code casent0005987. Photographer April Nobile, uploaded by California Academy of Sciences. Owned by MCZ, Cambridge, MA, USA.
Pyramica victrix casent0005988 head 1.jpgPyramica victrix casent0005988 profile 1.jpgPyramica victrix casent0005988 dorsal 1.jpgPyramica victrix casent0005988 label 1.jpg
Worker. Specimen code casent0005988. Photographer April Nobile, uploaded by California Academy of Sciences. Owned by MCZ, Cambridge, MA, USA.
Pyramica victrix casent0006026 head 1.jpgPyramica victrix casent0006026 profile 1.jpgPyramica victrix casent0006026 dorsal 1.jpgPyramica victrix casent0006026 label 1.jpg
Worker. Specimen code casent0006026. Photographer April Nobile, uploaded by California Academy of Sciences. Owned by MCZ, Cambridge, MA, USA.

Nomenclature

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

  • victrix. Pyramica victrix Bolton, 2000: 356, figs. 222, 242 (w.q.) MADAGASCAR. Combination in Strumigenys: Baroni Urbani & De Andrade, 2007: 130

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 2.1, HL 0.53, HW 0.41, CI 77, ML 0.10, MI 19, SL 0.26, SI 63, PW 0.24, AL 0.56. Clypeus clothed with small, anteriorly directed appressed squamate hairs that are much smaller than the hairs that fringe the clypeal margins. Lateral margin of clypeus, dorsolateral margin of head behind level of frontal lobe, and leading edge of scape each with a continuous fringe of curved spoon-shaped hairs. Vertex everywhere with similar spoon-shaped hairs except close to the occipital margin where there is a transverse row of 4 simple hairs that may be erect or gently curved anteriorly. Eye small, of 4-5 ommatidia. Pronotal humeral hair simple, straight to feebly curved and acute apically. Promesonotal dorsum with sparse short curved spatulate ground-pilosity, the mesonotum also with 3 pairs of erect simple hairs. Petiole, postpetiole and first gastral tergite with erect simple hairs present. Dorsum of head coarsely reticulate-punctate. Promesonotal dorsum reticulate-punctate, but more finely so than the head, the pronotum also with a few very feeble oblique or longitudinal costulae. Dorsum and declivity of propodeum much more superficially sculptured than mesonotum; petiole superficially sculptured; postpetiole disc smooth. Disc of postpetiole in dorsal view not completely surrounded by spongiform tissue, the anterolateral angles and anterior sides free. Lateral margins of disc conspicuously convex. Pleurae and side of propodeum smooth. Lamella of propodeal declivity engages tooth for about half its length, the lamella relatively narrow and not projecting posteriorly beyond the level of the apex of the tooth. Ventral spongiform curtain of petiole absent beneath peduncle, present beneath node. Ventral spongiform lobe of postpetiole in profile about equal to the exposed area of the disc.

Paratypes. TL 2.1-2.3, HL 0.51-0.55, HW 0.40-0.44, CI 76-79, ML 0.10, MI 16-19, SL 0.25-0.29, SI 63-66, PW 0.23-0.27, AL 0.55-0.58 (7 measured). As holotype but ventral spongiform curtain of petiole represented by a vestige below the peduncle in some workers.

Type Material

Holotype worker, Madagascar: 45 km. S Ambalavao, 22°13'S, 47°01'E, 785 m., 25.ix.1993, sifted litter (leaf mold, rotten wood), rainforest, #696 (37)-8 (B.L. Fisher) (Museum of Comparative Zoology).

Paratypes. 10 workers with same data as holotype; 1 worker and 1 queen (dealate) with same data but #696 (21)-5; 2 workers with same data but #696 (48)-6 (University of California, Davis, MCZ, The Natural History Museum).

References

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.