Strumigenys carisa

Every Ant Tells a Story - And Scientists Explain Their Stories Here
Jump to navigation Jump to search
Strumigenys carisa
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Strumigenys
Species: S. carisa
Binomial name
Strumigenys carisa
Fisher, 2000

Strumigenys carisa casent0005501 profile 1.jpg

Strumigenys carisa casent0005501 dorsal 1.jpg

Specimen labels

Identification

Bolton (2000) - A member of the carisa complex in the Strumigenys arnoldi-group. S. carisa and Strumigenys fronto belongs to the carisa-complex and are diagnosed by left and right mandible having a single preapical tooth and the pronotal humeral hair being long, stiffly projecting and filiform.

S. carisa can be distinguished from fronto by the absence on the upper scrobe margin of stiff erect hairs that are longer than the hairs on leading edge of scape. In addition carisa possesses a longer and relatively narrower head (HL 0.95-1.00, CI < 70) than fronto (HL 0.80-0.88, CI > 80).

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Malagasy Region: Madagascar (type locality).


Distribution based on AntMaps

AntMapLegend.png

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.

  • carisa. Strumigenys carisa 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 4.1, HL 0.98, HW 0.65, CI 66, ML 0.60, MI 61, SL 0.73, SI 112, PW 0.42, AL 1.04. Characters of carisa-complex. Each mandible with 1 preapical acute tooth, situated in the apical third of the length. Upper scrobe margin not bordered by a projecting laminar rim or flange throughout its length, eyes clearly visible in full-face view. Eye small, convex, its maximum diameter slightly greater than maximum width of scape. Scape long and slender, subcylindrical and approximately straight; hairs on leading edge narrowly spatulate. Cephalic dorsum densely clothed with curved narrowly spatulate ground-pilosity; upper scrobe margin fringed with hairs that are similar in size and shape to those on the dorsum. Cephalic dorsum with 2 pairs of long stout standing remiform hairs arranged in a transverse row close to the occipital margin; paratype and non-paratype with 1 additional pair of erect hairs near vertex. Dorsum of head reticulate-punctate and also with longitudinally rugulose sculpture, more pronounced on occipital angles. Pronotal humeral hair long, stout and filiform; humeral angles rounded. Mesonotum with 1 pair of stout standing narrowly spatulate hairs, on anterior margin. Ground-pilosity on alitrunk dorsum as on head but sparser. Dorsum of alitrunk in outline convex anteriorly, posterior mesonotum sharply depressed, propodeum more or less flat. Metanotal groove represented by a transverse ridge or carina. Propodeal spines narrowly triangular, diverging, lamella absent from declivity. Alitrunk dorsum densely reticulate-punctate. Promesonotal dorsum with superimposed striolate and rugulose sculpture. Sides of pronotum striolate to reticulate-punctate. Pleurae mostly reticulate-punctate, katepisternum partially smooth and shiny. Petiolar peduncle long and slender. Petiole node in dorsal view longer than broad. Postpetiole disc longitudinally striolate with faint punctures present on lateral margin. On paratype specimen, central area of postpetiole disc more or less smooth and shiny. In profile ventral spongiform tissue of petiolar peduncle a very narrow, irregular strip that is not continuous along the base of the peduncle, maximum depth of strip distinctly less than the maximum width of eye. Ventral spongiform lobe of postpetiole moderately developed. Basigastral costulae very short but distinct. Dorsal surface of petiole with one pair and postpetiole with 3 pairs of long, erect remiform to narrowly spatulate hairs, gaster with stout standing remiform to narrowly spatulate hairs. Colour light to medium brown.

Paratypes. TL 4.2, HL 1.00, HW 0.68, CI 68, ML 0.66, MI 66, SL 0.75, SI 110, PW 0.42, AL 1.07 (1 measured). As holotype.

Measurements of this specimen extend the range shown by the type-series: HL 0.95, HW 0.63, CI 66, ML 0.60, MI 63, SL 0.73, SI 115, PW 0.41, AL 1.01 (1 measured) but otherwise as type-specimens.

Type Material

Holotype worker, Madagascar: 9.2 km. WSW Befingotra, Res. Anjanaharibe-Sud, 14°45'S, 49°28'E, 1200 m., 9.xi.1994, sifted litter (leaf mold rotten wood), montane rainforest #1192 (26)-6 (B. L. Fisher) (Museum of Comparative Zoology).

Paratypes. 1 worker with same data as holotype but 5.xi.1994, 1280 m, #1158 (5)-5 (The Natural History 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)