Leptogenys borneensis

Leptogenys borneensis
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Hymenoptera
Family:	Formicidae
Subfamily:	Ponerinae
Tribe:	Ponerini
Genus:	Leptogenys
Species:	L. borneensis
Binomial name
	Leptogenys borneensis; Wheeler, W.M., 1919 Specimen Labels

A colony of Leptogenys borneensis from Sumatra, Indonesia, was found in a decayed wood stump along a hiking trail (ca. 1500 m a.s.l.). Workers and males were found but no queen was located in the colony (Satria et al., 2024).

Identification

Satria et al. (2024) - Head in frontal view with its posterior margin slightly convex; mandible triangular; clypeus strongly carinate. Mesosoma in lateral view, long and slender; dorsal margin of mesothorax slightly concave; posterior margin of petiole weakly convex. Petiolar node in frontal and lateral views with a bluntly pointed apex, in lateral view with anterior slope broadly convex and posterior slope weakly convex or almost straight; subpetiolar process not developed. The body dark brown with legs and antennae paler.

Distribution

Latitudinal Distribution Pattern

Latitudinal Range: 14.531044° to 1.55°.


North Temperate	North Subtropical	Tropical	South Subtropical	South Temperate

Source: AntMaps

Distribution based on Regional Taxon Lists

Indo-Australian Region: Borneo (type locality), Indonesia, Malaysia, Singapore.
Oriental Region: Thailand, Vietnam.

Distribution based on AntMaps

Distribution based on AntWeb specimens

Check data from AntWeb

Countries Occupied

Number of countries occupied by this species based on AntWiki Regional Taxon Lists. In general, fewer countries occupied indicates a narrower range, while more countries indicates a more widespread species.

Estimated Abundance

Relative abundance based on number of AntMaps records per species (this species within the purple bar). Fewer records (to the left) indicates a less abundant/encountered species while more records (to the right) indicates more abundant/encountered species.

Biology

Association with Other Organisms

Explore: Show all Associate data or Search these data. See also a list of all data tables or learn how data is managed.

This species is a associate (details unknown) for the phorid fly Rhynchomicropteron nudiventer (a associate (details unknown)) (Disney et al., 2009; Quevillon, 2018).

Castes

Satria et al. (2024), Fig. 1. Leptogenys borneensis (worker, individual code: SEMUT13xii2021-A, colony code: RS-SAGO-02): A — head in full-face view; B — body in lateral view; C — mesosoma in lateral view; D — mesosoma in dorsal view; E — petiole in lateral view.
Satria et al. (2024), Fig. 2. Leptogenys borneensis (male, individual code: SEMUT13xii2021-B, colony code: RS-SAGO-02): habitus in lateral view.
Satria et al. (2024), Fig. 3. Leptogenys borneensis (male, individual code: SEMUT13xii2021-B, colony code: RS-SAGO-02): A — head in full-face view; B — ocelli; C — mesosoma in lateral view; D — mesosoma in dorsal view; E — petiole in lateral view; F — petiole in dorsal view; G — forewing; H — hind wing.
Satria et al. (2024), Fig. 4. Leptogenys borneensis (male, individual code: RJ7-8vi22, colony code: RS-SAGO-02): A — abdominal sternite IX; B — abdominal tergite IX; C — Gonopod (paramere) and volsella, left-side, inner view; D — penisvalva, left-side, inner view.

Nomenclature

The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.

borneensis. Leptogenys (Lobopelta) borneensis Wheeler, W.M. 1919e: 59 (w.) BORNEO. Imai, Brown, et al. 1984: 67 (k.).

Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.

Description

Male

Satria et al. (2024) n= 3: HW 1.54–1.56 mm, HL 1.31–1.32 mm, EL 0.82 mm, EW 0.61–0.62 mm, OL 0.18 mm, OED 0.24 mm, SL 1.17 mm, WL 3.30 mm, PTH 0.69–0.70 mm, PTL 0.80 mm, CI 84–85, SI 88, PTHI 86–87. Head in full-face view oval, slightly shorter than wide; posterior margin of head convex. Preoccipital carina distinct dorsally and laterally, but not forming a flange. Mandible without basal angle and teeth, apex rounded. Palp formula: 4, 4. Eye large and occupies 2/3 of head length. Ocelli large; major axis of median ocellus longer than minimum distance between lateral ocelli; major axis of lateral ocellus shorter than minimum distance between lateral ocellus and eye. Antenna 13-merous; scape length less than half of head width, 2/3 as long as 3rd antennomere; 2nd antennomere 0.25 as long as scape; 3rd to 12th antennomeres each extremely long and cylindrical; 13th antennomere extremely long, tapering apically. Clypeus without longitudinal median carina; anterior margin broadly convex.

Mesoscutum in dorsal view longer than wide, widest posterior to mid-length, broadly convex in lateral view; notaulus scrobiculate; parapsidal line longer than half length of mesoscutal sulcus; transscutal line sinuous. Mesopleuron distinct and complete. Metapleuropropodeal suture present. Propodeal dorsum in lateral view straight, longer than length of declivity; propodeal declivity broadly convex; propodeal spiracle circular. Wing venation as in figs with stigma; fore wing approximately 3 times as long as wide, approximately 1.3 times as long as hind wing length; hind wing approximately 3.5 times as long as wide. Fore tibia with single spur, each middle and hind tibia with two spurs. Pretarsal claw multidentate.

Petiole in lateral view longer than height, in dorsal view longer than wide; lateral margin straight in dorsal view; petiolar node in lateral view subtrapezoidal, anterior margin inclined posterad, posterior margin slightly inclined anterad. Anterior lobe of subpetiolar process in lateral view short, with postero-ventral angle sharpened; posterior extension in lateral view long and low, separated from anterior lobe by shallow notch, with ventral margin broadly convex. Pygostyle digitiform with long setae on apical half. Abdominal sternite 9 with elongate, subtriangular apical lobe of which apex is round.

Genital capsule longer than broad. Gonopod apex in lateral view longer than high. Lateropenite in lateral view rectangular with rounded corners and long, its posterior margin as long as cuspis. Cuspis in lateral view elongate and weakly arched dorsal of lateropenite, apically slightly swollen, rounded. Apicoventral apex of valviceps strongly produced; basiventral corner of valviceps distinctly produced; ventral margin of valviceps with 13 denticles.

Head entirely smooth and shiny, except on area between median and lateral ocelli fine ly striate. Mandible and clypeus weakly sculptured. Pronotum, mesoscutum, mesopleuron, propodeum, petiole and gaster smooth and shiny; mesoscutellum with longitudinal striation.

Head, mesosoma, legs, petiole and gaster with fine dense subdecumbent to decumbent various length of hairs; hairs on head longer than other.

For color pattern see figures; body basically dark brown; clypeus, mandible, antennal scape, and legs paler.

Karyotype

n = 23, 2n = 46 (Malaysia) (Imai et al., 1983; Mariano et al., 2015).

References

Disney, R.H.L., Lizon à l’Allemand, S., von Beeren, C. & Witte, V. (2009) A new genus and new species of scuttle flies (Diptera: Phoridae) from colonies of ants (Hymenoptera: Formicidae) in Malaysia. Sociobiology, 53, 1–12.
Imai, H. T.; Brown, W. L., Jr.; Kubota, M.; Yong, H.-S.; Tho, Y. P. 1984. Chromosome observations on tropical ants from western Malaysia. II. Annu. Rep. Natl. Inst. Genet. Jpn. 34: 66-69 (page 67, karyotype described)
Mariano, C.S.F., Santos, I.S., Silva, J.G., Costa, M.A., Pompolo, S.G. 2015. Citogenética e evolução do cariótipo em formigas poneromorfas. In: Delabie, J.H.C., Feitosa, R.M., Serrao, J.E., Mariano, C.S.F., Majer, J.D. (eds) As formigas poneromorfas do Brasil, 1st edn. Ilhéus, Brasil, pp 102–125 (doi:10.7476/9788574554419.0010).
Satria, R., Nugraha, F.A.D., Achyar, A., Zulyetti, D., Eguchi, K. 2024, Description of the male caste of Leptogenys borneensis (Hymenoptera, Formicidae), with its first discovery in Sumatra. Zoodiversity 58 (1), 19-26 (doi:10.15407/zoo2024.01.19).
Wang, W.Y., Soh, E.J.Y., Yong, G.W.J., Wong, M.K.L., Benoit Guénard, Economo, E.P., Yamane, S. 2022. Remarkable diversity in a little red dot: a comprehensive checklist of known ant species in Singapore (Hymenoptera: Formicidae) with notes on ecology and taxonomy. Asian Myrmecology 15: e015006 (doi:10.20362/am.015006).
Wheeler, W. M. 1919f. The ants of Borneo. Bulletin of the Museum of Comparative Zoology 63: 43-147 (page 59, worker described)

References based on Global Ant Biodiversity Informatics

Chapman, J. W., and Capco, S. R. 1951. Check list of the ants (Hymenoptera: Formicidae) of Asia. Monogr. Inst. Sci. Technol. Manila 1: 1-327
Eguchi K., B. T. Viet, and S. Yamane. 2014. Generic Synopsis of the Formicidae of Vietnam (Insecta: Hymenoptera), Part IICerapachyinae, Aenictinae, Dorylinae, Leptanillinae, Amblyoponinae, Ponerinae, Ectatomminae and Proceratiinae. Zootaxa 3860: 001-046.
Jaitrong W., and T. Ting-Nga. 2005. Ant fauna of Peninsular Botanical Garden (Khao Chong), Trang Province, Southern Thailand (Hymenoptera: Formicidae). The Thailand Natural History Museum Journal 1(2): 137-147.
Jaitrong W.; Nabhitabhata, J. 2005. A list of known ant species of Thailand. The Thailand Natural History Museum Journal 1(1): 9-54.
Maruyama M., C. von Beeren, and V. Witte. 2010. Aleocharine rove beetles (Coleoptera, Staphylinidae) associated with Leptogenys Roger, 1861 (Hymenoptera, Formicidae) II. Two new genera and two new species associated with L. borneensis Wheeler, 1919. Zookeys 59: 6172.
Pfeiffer M.; Mezger, D.; Hosoishi, S.; Bakhtiar, E. Y.; Kohout, R. J. 2011. The Formicidae of Borneo (Insecta: Hymenoptera): a preliminary species list. Asian Myrmecology 4:9-58
Sakchoowong W., W. Jaitrong, and K. Ogata. 2009. Comparison of ground-ant diversity between natural forests and disturbed forests along a natural gas pipeline transect in Thong Pha Phum National Park, Kanchanaburi province. Kasetsart J. (Nat. Sci) 43: 64-73.
Wheeler W. M. 1919. The ants of Borneo. Bulletin of the Museum of Comparative Zoology 63:43-147.
Zryanin V. A. 2011. An eco-faunistic review of ants (Hymenoptera: Formicidae). In: Structure and functions of soil communities of a monsoon tropical forest (Cat Tien National Park, southern Vietnam) / A.V. Tiunov (Editor). – M.: KMK Scientific Press. 2011. 277 р.101-124.