Strumigenys victrix
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) |
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 |
- Source: AntMaps
Distribution based on Regional Taxon Lists
Malagasy Region: Madagascar (type locality).
Distribution based on AntMaps
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. |
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. |
Biology
Castes
Worker
Images from AntWeb
Paratype of Strumigenys victrix. Worker. Specimen code casent0005463. Photographer April Nobile, uploaded by California Academy of Sciences. | Owned by CAS, San Francisco, CA, USA. |
Paratype of Strumigenys victrix. Worker. Specimen code casent0005464. Photographer April Nobile, uploaded by California Academy of Sciences. | Owned by CAS, San Francisco, CA, USA. |
Worker. Specimen code casent0005987. Photographer April Nobile, uploaded by California Academy of Sciences. | Owned by MCZ, Cambridge, MA, USA. |
Worker. Specimen code casent0005988. Photographer April Nobile, uploaded by California Academy of Sciences. | Owned by MCZ, Cambridge, MA, USA. |
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
- Baroni Urbani, C. & De Andrade, M.L. 2007. The ant tribe Dacetini: limits and constituent genera, with descriptions of new species. Annali del Museo Civico di Storia Naturale “G. Doria”. 99:1-191.
- Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028. (page 356, worker described)
- Tang, K. L., Guénard, B. 2023. Further additions to the knowledge of Strumigenys (Formicidae: Myrmicinae) within South East Asia, with the descriptions of 20 new species. European Journal of Taxonomy 907, 1–144 (doi:10.5852/ejt.2023.907.2327).
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.