Leptogenys fotsivava

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Leptogenys fotsivava
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Ponerinae
Tribe: Ponerini
Genus: Leptogenys
Species group: truncatirostris
Species complex: ridens
Species: L. fotsivava
Binomial name
Leptogenys fotsivava
Rakotonirina & Fisher, 2014

Leptogenys fotsivava casent0001423 p 1 high.jpg

Leptogenys fotsivava casent0001423 d 1 high.jpg

Specimen Labels

Leptogenys fotsivava has been found foraging on the surface of the ground and through leaf litter. Colony nests are known to be in soil layers and under rocks. Raiding behavior has been observed in the PN Isalo along a portion of the Sahanafa River.

Identification

A member of the ridens complex of the truncatirostris species group. Rakotonirina and Fisher (2014) - Worker. Clypeus with median carina, distance between anterior level of torulus and anteromedial clypeal margin greater than maximum width of scape; antennal scape relatively short; eye medium, maximum diameter between one-third and one-fourth the length of side of head; breaking outline of side of head; dorsum of mesosoma, petiolar node and gaster with few short suberect hairs and dense pubescence.

Keys including this Species

Distribution

Leptogenys fotsivava is distributed in natural dry forest habitats, gallery forests, and Uapaca woodlands in southern Madagascar, but also occurs in anthropogenic habitats.

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

The Leptogenys genus page has more details about the general biology of ants in this genus. The following synopsis provided by Rakotonirina and Fisher (2014) offers an overview of the Malagasy Leptogenys: Recent surveys of arthropods in the Malagasy region uncovered a wealth of new species and showed that Leptogenys is one of the dominant ponerine ants widely distributed across all types of forest habitats. Workers are usually found foraging on the forest floor or in the leaf litter and only rarely on vegetation. They nest terrestrially under the soil, rocks, logs, or rootmat ground layers and in rotten logs, branches, in rotting bamboo, and rotten tree stumps. Most of the Malagasy species are endemic to Madagascar. In all Malagasy species, winged queens are absent, which limits their ability to disperse across the complex topography and various ecological barriers in the region. In the absence of alate queens, reproduction of Leptogenys in the region may be by fission, which enhances population viscosity and may result in important morphological variation across a species' geographic range. Though queens do not fly, males of Leptogenys are alate and are one of the most frequently collected ant genera in Malaise traps throughout Madagascar. Leptogenys exhibits a wide range of phenotypic diversity segregated both among spatially isolated habitats and along continuous environmental gradients.

Castes

Nomenclature

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

  • fotsivava. Leptogenys fotsivava Rakotonirina & Fisher, 2014: 147, figs. 13B, 17A, 163, 172 (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

(8 specimens). HW: 0.98–1.17, HL: 1.18–1.33, CI: 82–90, SL: 1.15–1.39, SI: 112–119, PW: 0.72–0.84, WL: 1.91–2.15, PNH: 0.66–0.73, PNL: 0.53–0.57, PNW: 0.56–0.65, DNI: 106–115, LNI: 124–137.

Head longer than broad in full-face view, width weakly increasing from behind to front, sides generally straight anteriorly from posterior level of eyes and rounding into a more or less straight posterior margin. Eye medium, maximum diameter between one-third and one-fourth the length of side of head; small girth slightly breaking outline of sides of head. Antennal scape relatively short, about one-fourth of the length extending beyond posterior cephalic border. Median clypeal carina present; anteromedial clypeal margin rounded and covered with semi-translucent membranous spot. In full-face view, median lobe of clypeus relatively long, distance measured from anterior level of torulus to anteromedian clypeal margin greater than maximum diameter of scape. In full-face view, if mandible tightly closed against clypeus, basal two-thirds of blades touching anterior margin of clypeus while their apical third portions overlapping each other and extending downward in front of clypeus. With mesosoma in dorsal view, metanotal groove impressed, with faint cross-ribs. In lateral view, propodeal lobe absent. With petiole in dorsal view, node roughly as broad as long. Mandible longitudinally striate nearly to midlength; remaining portion smooth and shining apart from sparse punctures. Dorsum of head, mesosoma and petiolar node densely and finely reticulate-rugose to densely and finely reticulate-punctate. Third abdominal tergite densely and finely reticulate-punctate dorsally and mostly finely punctate laterally; fourth generally finely punctate. Pubescence numerous on entire dorsum of body, with sparse, suberect, short hairs. Color black to dark brown, with reddish-brown basal portion of appendages and light brown apices.

Holotype Specimen Labels

Type Material

Holotype worker: Madagascar, Toliara, Forêt de Kirindy, 15.5 km 64° ENE Marofandilia, -20.045, 44.6622, 100 m, tropical dry forest, ground nest, 28 Nov–3 Dec 2001 (Fisher-Griswold Arthropod Team) collection code: BLF04671, specimen code: CASENT0001423 (California Academy of Sciences). Paratypes: series of 6 workers with the same data as holotype but with the following specimen codes: CASENT0001421, CASENT00011422, CASENT0247211, CASENT0247212, CASENT0247213, CASENT0247214 (CASC, The Natural History Museum, Musee d'Histoire Naturelle Genève, Museum of Comparative Zoology, Parc Botanique et Zoologique de Tsimbazaza).

References

  • Rakotonirina, J.C. & Fisher, B.L. 2014. Revision of the Malagasy ponerine ants of the genus Leptogenys Roger (Hymenoptera: Formicidae). Zootaxa 3836, 1-163.