Leptogenys antongilensis

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Leptogenys antongilensis
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Ponerinae
Tribe: Ponerini
Genus: Leptogenys
Species group: incisa
Species complex: imerinensis
Species: L. antongilensis
Binomial name
Leptogenys antongilensis
Emery, 1899

Leptogenys antongilensis casent0102015 profile 1.jpg

Leptogenys antongilensis casent0102015 dorsal 1.jpg

Specimen labels

Leptogenys antongilensis is limited to the lowland rainforest of northeastern Madagascar. It mainly forages on the forest floor and nests in rotten logs and rotten tree stumps, though foraging behavior may also occur on lower vegetation.

Identification

A member of the imerinensis complex of the incisa species group. Rakotonirina and Fisher (2014) - Worker. Anteromedian border of clypeus above semi-translucent lamella with anteriorly projecting peg-like setae; antennal scape relatively long (SI: 132–138), more than a third of apical portion extending beyond posterior cephalic margin; inner margin of mandible blades generally convex and distinctly broadest at mid-length; mesosoma with three visible segments, no other impression as a sclerite in appearance on dorsum of propodeum..

This species is generally similar to Leptogenys manja, but can be easily identified by the fine longitudinal striation on its mandible and the convex inner margin of the blades. In L. manja, the mandibles are smooth and the inner margin of the blades is evenly concave. It can be separated from Leptogenys tatsimo by its three-segmented mesosoma and the narrow lamella bordering the anterior clypeal margin.

Keys including this Species

Distribution

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

Castes

Worker

Nomenclature

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

  • antongilensis. Leptogenys incisa var. antongilensis Emery, 1899f: 272 (w.) MADAGASCAR. Combination in L. (Machaerogenys): Emery, 1911d: 100. Raised to species: Emery, 1911d: 100.

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) - (8 specimens). HW: 1.49–1.58, HL: 1.86–1.97, CI: 80–82, SL: 2.03–2.13, SI: 132–138, PW: 1.22–1.30, WL: 3.13–3.40, PNH: 0.88–0.94, PNL: 0.96–1.05, PNW: 0.87–0.95, DNI: 88–94, LNI: 88–94.

Head subrectangular, slightly broader in front than at the posterior; sides slightly convex and diverging. Posterior margin of head very weakly concave. Eye protruding and projecting beyond lateral margins of head. Antennal scape very long, almost reaching posterior cephalic margin at midpoint. Clypeus with broad, triangular anteromedian lobe; anterior clypeal margin bordered with more or less wide, semi-transparent lamella. Mandible elongate, inner margin convex and blades broadest at midlength, but not capable of closing tightly against clypeus when their apices intersect. Hypostomal teeth short and notvisible with head in full-face view. Mesosoma elongate and relatively low in lateral view; in dorsal view three sections visible, no additional suture present posterior of metanotal groove. With petiole in dorsal view, node longer than broad, and fairly broader than high in profile; posterior margin inclined anteriorly and anterior face vertical, both forming convex lines to rounded dorsal margin. Mandible longitudinally striate, striation occasionally interrupted by smooth spaces and scattered piligerous punctures. Dorsum of head, mesosoma, and petiolar node densely and finely reticulate-punctate to densely and finely reticulate-rugose, with sparse small punctures between sculptures. Third and fourth abdominal tergites smooth and shiny, with small punctures. Body covered with thin erect hairs and pubescence. Black in color; appendages and gaster with brown apical section.

Type Material

Rakotonirina and Fisher (2014) - Lectotype worker, present designation, Madagascar, Toamasina, Bia di Antongil, 1897–1898 (A. Mocquerys), AntWeb CASENT0102015 (Museo Civico di Storia Naturale, Genoa). Paralectotype worker with same data as lectotype but with CASENT0102016 (MSNG) [examined].

References

  • Bolton, B. 1975a. A revision of the ant genus Leptogenys Roger (Hymenoptera: Formicidae) in the Ethiopian region with a review of the Malagasy species. Bull. Br. Mus. (Nat. Hist.) Entomol. 31: 235-305 (see also)
  • Emery, C. 1899e. Formiche di Madagascar raccolte dal Sig. A. Mocquerys nei pressi della Baia di Antongil (1897-1898). Bull. Soc. Entomol. Ital. 31: 263-290 (page 272, worker described)
  • Emery, C. 1911e. Hymenoptera. Fam. Formicidae. Subfam. Ponerinae. Genera Insectorum 118: 1-125 (page 100, Combination in L.(Machaerogenys) , and raised to species)
  • Rakotonirina, J.C. & Fisher, B.L. 2014. Revision of the Malagasy ponerine ants of the genus Leptogenys Roger (Hymenoptera: Formicidae). Zootaxa 3836, 1-163.