Leptogenys incisa

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Leptogenys incisa
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Ponerinae
Tribe: Ponerini
Genus: Leptogenys
Species group: incisa
Species complex: alluaudi
Species: L. incisa
Binomial name
Leptogenys incisa
Forel, 1891

Leptogenys incisa casent0077457 profile 1.jpg

Leptogenys incisa casent0077457 dorsal 1.jpg

Specimen Label

Only known from Madagascar, L. incisa is represented by one worker specimen collected from the transitional forest of Ambilanivy in the north-west peninsular area of Ampasindava and a few specimens from the Chains of Galoko Mountain. A few specimens were found foraging through leaf litter and others were found nesting in a rotten log.

Identification

A member of the alluaudi complex of the incisa species group. Rakotonirina and Fisher (2014) - Worker. Anteromedian border of clypeus, posterad of semi-translucent lamella without anteriorly projecting, small, peg-like setae. In full-face view, head distinctly elongate (CI: 85); eye breaking lateral cephalic margin; mandible strongly curved near the base, blades more or less broad, with slightly convex inner margin at about distal third, outer surfaces with dense and fine longitudinal striations; large species.

In addition to the strongly curved basal portion of its mandible, L. incisa has generally broader blades whose outer surfaces are finely, longitudinally striate. Its head is much more elongate than that of Leptogenys alluaudi and Leptogenys pilaka. In L. alluaudi and L. pilaka, the mandibles are not strongly curved near the bases, narrower and generally smooth besides piligerous punctures.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Afrotropical Region: Mozambique.
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.

  • incisa. Leptogenys incisa Forel, 1891b: 113, pl. 4, fig. 1 (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

Rakotonirina and Fisher (2014) - (1 specimen). HW: 1.87, HL: 2.19, CI: 85, SL: 2.67, SI: 143, PW: 1.42, WL: 3.83, PNH: 1.26, PNL: 1.18, PNW: 1.13, DNI: 96, LNI: 107.

Head elongate and distinctly increasing in width from rear to front; lateral margin weakly convex along their length. Eye large, protruding from surface of head and breaking lateral cephalic border. Antennal scape relatively long (SI: 143). Clypeus with a narrowly triangular anteromedial margin; lateral margin slightly convex and strongly converging anteriorly, bordered with narrow lamella which becomes obtusely angulate on the anterior clypeal margin. Mandible long and strongly curved near the base; inner margin broadly convex at about distal third; basal groove impressed. Hypostomal teeth not visible when head in full-face view. In lateral view, mesosoma short and high; propodeal dorsum forming distinct angle with declivity; posterolateral margin of propodeum at about the level of propodeal spiracle with toothlike lobe. With mesosoma in dorsal view, metanotal groove impressed; metanotal sclerite indistinct. Visible constriction present between third and fourth abdominal segments. Mandible densely and finely striate, with sparse, small punctures. Head dorsum with longitudinal rugulae in front at the level of anterior margin of eyes and with dense, transverse reticulate-rugulae behind the level of eyes; large, shallow punctures present on the effaced rough sculpture near the occiput. Pronotum finely microreticulate, superimposed with coarse punctures. Rest of mesosoma, dorsum and petiolar node coarsely and transversely rugose. Propodeal declivity with transverse rugae. Third abdominal tergite covered with small and quite sparse punctures. Standing hairs long and slender, with reduced pubescence on mesosoma, petiolar node and gaster. Integument black, with dark brown appendages and light brown tarsal segments and apex of gaster.

Type Material

Rakotonirina and Fisher (2014) - Syntype workers, Madagascar, Montagne de Lokobe, Nosy-be (O’Swald) (location of types unknown).

References