Leptogenys johary

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

Leptogenys johary casent0102923 p 1 high.jpg

Leptogenys johary casent0102923 d 1 high.jpg

Specimen Labels

Individual workers of this species have been discovered foraging on the forest floor and in leaf litter. One nest was found under a rock.

Identification

A member of the attenuata species group. Rakotonirina and Fisher (2014) - Worker. Third antennal segment twice as long as second segment; eye large, maximum diameter about one-fourth the length of lateral cephalic margin; breaking line of side of head; in dorsal view, mesonotum broader than long and petiolar node remarkably elongate and strongly narrowed anteriorly.

Keys including this Species

Distribution

The northernmost range of L. johary in Madagascar is limited to the montane rainforest of the PN Masoala between 800–897 m, Amparihibe at 846 m, and the rainforest of Makira between 470–600 m. The southernmost distribution of this species is restricted to the RNI Betampona at an elevational range of 525–550 m and the FC Didy at 960 m.

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.

  • johary. Leptogenys johary Rakotonirina & Fisher, 2014: 52, figs. 20A, 21A, 66, 79 (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: 0.95–0.98, HL: 1.38–1.47, CI: 66–69, SL: 1.37–1.48, SI: 143–153, PW: 0.74–0.83, WL: 2.21–2.33, PNH: 0.57–0.60, PNL: 0.73–0.80, PNW: 0.41–0.43, DNI: 51–57, LNI: 73–77.

Head elongate, very slightly diverging anteriorly, sides subparallel; posterior margin weakly concave. Mandible basal margin with blunt angle or preapical tooth. In full-face view, eye maximum diameter roughly one fourth the length of side of head; location breaking outline of side of head. Antennal scape long, about one third of its length surpassing posterior cephalic border; third antennal segment distinctly long, twice as long as the second. In dorsal view, mesonotum broader than long. Posterolateral margin of propodeum approximately at level of propodeal spiracle with toothlike lobe; propodeal spiracle rounded. With petiole in dorsal view, node elongate, twice as long as broad and greatly narrowed anteriorly. Mandible and clypeus smooth interspersed with scattered piligerous punctures; rest of body dorsum and propodeal declivity generally smooth and shining. Standing hairs arise from very small punctures, with longer, erect hairs on head and pronotum and much shorter hairs on rest of body dorsum. Body color brown to dark brown, with lighter appendages.

Type Material

Holotype worker: Madagascar, Toamasina, Montagne d'Akirindro 7.6 km 341° NNW Ambinanitelo, -15.28833, 49.54833, 600 m, rainforest, under stone, 17–21 Mar 2003 (Fisher, Griswold et al.) collection code: BLF08310, specimen code: CASENT0496266 (California Academy of Sciences). Paratypes: series of 8 workers, with same data as holotype but specimen coded: CASENT0496267, CASENT0496268, CASENT0196535, CASENT0247199, CASENT0247200, CASENT0247201, CASENT02472 02, CASENT0247273 (CASC, 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.