Brachyponera nakasujii

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Brachyponera nakasujii
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Ponerinae
Tribe: Ponerini
Genus: Brachyponera
Species: B. nakasujii
Binomial name
Brachyponera nakasujii
Yashiro, Matsuura, Guénard, Terayama & Dunn, 2010

Brachyponera nakasujii nests in rotten wood or leaf litter on the ground. It is common in Honshu, Shikoku, and Kyushu, Japan, where it is sympatric with Brachyponera chinensis. Although B. nakasujii and B. chinensis are sympatrically distributed in temperate zones, B. nakasujii is rare in dry and disturbed area, where B. chinensis remains common. Both species have been observed to nest near termite nests frequently and to carry termites back to their nests as food. (Yashiro et al. 2010)


Yashiro et al. (2010) - This species belongs to the Brachyponera chinensis species complex (see Caste section below for images that can help with determinations as explained here). It is easily distinguished from the sympatric species Brachyponera chinensis in the worker by having a proportionally wider petiole (PI [Pronotal index: PW/HW x 100] = 60–64 in P. nakasujii, PI = 48–58 in B. chinensis) and in the male by having much darker coloration and the well developed mandibles. Moreover, the worker of this species is easily distinguished from another closely related species, Brachyponera luteipes, by having a proportionally wider petiole (PI = 60–64 in B. nakasujii, PI = 52–58 in B. luteipes) and a sculptured propodeum (largely smooth in B. luteipes).


Latitudinal Distribution Pattern

Latitudinal Range: 33.8446° to 30.51666667°.

Tropical South

Distribution based on Regional Taxon Lists

Palaearctic Region: Japan (type locality).

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.




Yashiro et al. 2010. FIGURE 4. Characters of worker propodeum and petiole. The left side of worker propodeum and petiole of P. nakasujii (A), P. chinensis (C) and P. luteipes (E), and the posterior face of worker petiole of P. nakasujii (B), P. chinensis (D) and P. luteipes (F) (Scanning electron microscopy photographs). Horizontal white arrow: PW. Also see Japanese Ant Database Group (2003).


Yashiro et al. 2010. Figure 5. Characters of male coloration and mandible of P. nakasujii (A, B), P. chinensis (C, D) and P. luteipes (E, F). Black arrows indicate the mandible.


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

  • nakasujii. Pachycondyla nakasujii Yashiro, Matsuura, et al. 2010: 44, figs. 4, 5 (w.q.m.) JAPAN.
    • Type-material: holotype worker, 15 paratype workers, 3 paratype queens, 3 paratype males.
    • Type-locality: holotype Japan: Okayama Pref., Okayama, Mt Handayama, 34°41’47’’N, 133°55’32’’E, 22 m., (T. Yashiro); paratypes: 8 workers, 3 queens with same data, 7 workers, 3 males Okayama Pref., Wake, Mt Tenjinyama, 34°50’56’’N, 134°07’47’’E, 206 m., 4.vii.2008 (T. Yashiro).
    • Type-depositories: NSMT (holotype); BMNH, MCZC, MSNG, NSMT, OMNH (paratypes).
    • Combination in Brachyponera: Schmidt, C.A. & Shattuck, 2014: 80.
    • Distribution: Japan.

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



(mm) holotype (paratypes, n = 15): HW 0.83 (0.79–0.85); HL 0.91 (0.88–0.94); SL 0.87 (0.83–0.92); EL 0.15 (0.14–0.18); WL 1.42 (1.36–1.47); MW 0.60 (0.59–0.64); PW 0.52 (0.49–0.55).Structure. Head slightly longer than wide, weakly round-sided behind eyes, with weakly emarginate posterior margin in full-face view. Mandible with 6 larger and 4 smaller teeth on the masticatory margin, and with distinct basal fovea. Antenna long, scape surpassing the posterior margin of head by less than 1/4 of its total length in full-face view; all funicular segments longer than wide. Pronotal dorsum bluntly demarcated from lateral face; seen from above anterolateral corner round. Mesonotum distinctly demarcated from pronotum and propodeum by deep furrows, posteriorly weakly emarginate. Mesopleuron with a somewhat vestigially transverse groove. In profile propodeum demarcated by a distinct obliquely running suture from metapleuron; posterior face well demarcated from lateral face by a rather sharp ridge, but separation from dorsal face indistinct. Petiole thin and high, with weakly convex dorsal margin in profile; in posterior view petiolar scale round and slightly higher than wide, with convex dorsal margin. Sculpture. Dorsum of head minutely and densely punctate. Clypeus with much more superficial sculpture and shiny except for sculptured median portion. Mandible finely striatopunctate except for the area around apex and along mesal margin smooth with large sparse punctures. Dorsum of pronotum finely punctate; its lateral face and mesonotum with still finer punctation; mesopleuron almost smooth and shiny, with rugulae in lower area; upper portion of metapleuron punctate, with smooth interspaces, lower portion rugose, with smooth interspaces. Dorsolateral face of propodeum irregularly sculptured and matte, posterior face smooth except for margins and upper portion weakly sculputured. Petiole anteriorly micropunctate, posteriorly smooth. Gastral segments densely and weakly punctate evenly over the surface. Pilosity. Body covered with decumbent pubescence except for mesopleuron, metapleuron, and posterior faces of propodeum and petiole that are almost bare. Standing hairs sparse; gastral tergites 1 and 2 each with more than ten standing hairs. Coloration. Body dark brown to blackish; gaster slightly lighter than head and mesosoma. Antennal funiculus, mandible, subpetiolar process and legs yellowish brown to orangish.


Structure. Body distinctly larger than the worker, with the head width ranging from 0.86 to 0.87 mm. Eye much larger than the worker; EL = 0.22–0.25 mm. Ocelli small, ca. 0.07 mm in maximum diameter; distance between posterior ocelli greater than that between anterior and posterior ocelli. Mesopleuron above always with a distinct transverse groove. Compared with the worker, petiole relatively thin, seen from above almost lacking dorsal flat portion. Sculpture. Body sculpture much as in the worker except for distinctly punctate metapleuron. Pilosity. Body covered with decumbent pubescence except for mesopleuron, and posterior faces of propodeum and petiole that are almost bare. Eye with short fine standing hairs. Mesosoma dorsally and gastral tergites with numerous long standing hairs. Coloration. Much as in the worker.


Structure. Head including eyes much wider than long. Eye large; EL = 0.26–0.27 mm, strongly convex, mesally weakly emarginate. Clypeus transverse with anterior and posterior margins truncate; labrum anteriorly produced as a narrow lobe. Mandible long and fragile, not opposable, basally wide and suddenly narrowed toward bluntly pointed apex. Ocelli small, ca. 0.08 mm in maximum diameter; distance between posterior ocelli much greater than that between anterior and posterior ocelli. Antenna long; scape twice as long as pedicel and shorter than segment 3. Pronotum short; mesoscutum large, with weak notauli and sharp parapsidal lines; mesopleuron large, with a wide transverse furrow which is striate on the bottom; scutellum dorsally convex with an anterior transverse zone which is much lower than the main disc; axilla extensively concave; metanotum short. Propodeum rounded; dorsal, lateral and posterior faces not clearly differentiated. Petiole relatively low, in profile rather strongly narrowed above, seen from back almost as wide as high, with dorsal margin almost straight; subpetiolar process flat, with obtuse posterior tooth in profile. Sculpture. Head superficially micropunctate. Pronotum, mesoscutum, metanotum and metapleuron weakly sculptured; mesopleuron extensively smooth and strongly shiny; axilla coarsely rugose. Propodeum more strongly and densely sculptured, but on its posterior face sculpture somewhat weaker. Anterior and posterior faces of petiole densely and irregularly sculptured; posterior face very weakly sculptured and somewhat shiny. Gaster only superficially sculptured. Pilosity. Body covered with decumbent pubescence except for mesopleuron, and posterior faces of propodeum and petiole that are almost bare. Petiole extensively with dense obliquely standing short hairs on its anterior and lateral faces; subpetiolar process below with standing hairs. Outer margin of forewing and hindwing with dense short fringe. Coloration. Body brown to pale brown, with ivory white legs.

Type Material

Holotype: worker, JAPAN, Okayama Prefecture, Okayama, Mt. Handayama, 34°41’47”N, 133°55’32”E, 22 m, 5 vi 2007, (coll. T. Yashiro). Paratypes: 3 queens and 8 workers from the same locality, 5 vi 2007, (coll. T. Yashiro); 3 males and 7 workers, JAPAN, Okayama Prefecture, Wake, Mt. Tenjinyama, 34°50’56”N, 134°07’47”E, 206 m, 4 vii 2008, (coll. T. Yashiro).

The holotype (NSMT-I-Hym 51990) is deposited in the National Museum of Nature and Science, Tokyo. Paratypes are deposited in the National Museum of Nature and Science, Tokyo, Japan; the Osaka Museum of Natural History, Osaka, Japan; the Museo Civico di Storia Naturale “Giacomo Doria”, Genova, Italy; the Natural History Museum, London, England; and the Museum of Comparative Zoology, Harvard University, Cambridge, USA.


This species is named in honor of Professor Emeritus Fusao Nakasuji, a notable Japanese entomologist and an authority on integrated pest management, who supervised the undergraduate and master's theses of one of the authors (Toshihisa Yashiro) at Okayama University.


References based on Global Ant Biodiversity Informatics

  • Fukumoto S. 2017. Records of ants (Hymenoptera: Formicidae) from Uji-shima, Uji Islands, Kagoshima, Japan. Nature of Kagoshima 43: 295–296.
  • Fukumoto S. and Sk. Yamane. 2015. Records of ants from Uke–jima, Amami Islands, Japan (Hymenoptera, Formicidae). Nature of Kagoshima 41: 195–197.
  • Fukumoto S., Jaitrong W. and Yamane S.K. 2013. Ant Fauna of Kuro-shima, Iwo-jima and Take-shima islands, Kagoshima Prefecture, southwestern Japan. Nature of Kagoshima 39: 119-125
  • Fukumoto S., R. Satria, T. Maeda, and S. Yamane. 2014. Ant fauna of Gaja-jima, Tokara Islands, southwestern Japan. Nature of Kagoshima 40: 127–131.
  • Fukumoto S., Sk. Yamane, and M. Hira. 2016. Records of ants from Yoro-Shima, Amami Gunto, Japan (Hymenoptera, Formicidae). Nature of Kagoshima 42: 461–464.
  • Fukumoto S., W. Jaitrong, and S. Yamane. 2013. Ant fauna of Take-shima, Iwo-jima and Kuro-shima islands, Kagoshima Prefecture, southwestern Japan. Nature of Kagoshima 39: 99-105.
  • Harada Y. S. Koto, N. Kawaguchi, K. Sato, T. Setoguchi, R. Muranaga, H. Yamashita, A. Yo, and S. Yamane. 2012. Ants of Jusso, Isa City, Kagoshima Prefecture, southwestern Japan. Bull. biogeogr. Soc. Japan 67: 143-152.
  • Harada Y., D. Fukukura, R. Kurisu, and S. Yamane. 2013. Ants of Ports, monitoring of alien ant species. Bull. Biogeogr. Soc. Japan 68: 29-40.
  • Harada Y., K. Asai, M. Araba and T. Higasayama. 2018. Ants at ports on Kuro-shima, Iwo-jima and Take-shima, Kagoshima Prefecture, Japan. Nature of Kagoshima 45: 129–134.
  • Harada Y., K. Nishikubo, K. Matsumoto, M. Matsuda, Y. Inazawa, Y. Ozono, S. Koto, N. Kawaguchi, and S. Yamane. 2011. Ant fauna of Japanese beech (Fagus crenata) forests in southwestern Japan. Bull. Biogeogr. Soc. Japan 66: 115-127.
  • Harada Y., M. Enomoto, K. Nishimuta, and H. Mizumata. 2015. Ants of the Amami Islands, central Ryukyus, Japan. Nature of Kagoshima 41: 199–208.
  • Harada Y., M. Enomoto, N. Nishimata, and K. Nishimuta. 2014. Ants of the Tokara Islands, northern Ryukyus, Japan. Nature of Kagoshima 40: 111–121.
  • Harada Y., Yadori H., Takinami R., Nagahama K., Matsumoto Y., Oyama A., Maeda S. and Yamane S.K. 2013. Ants of the southernmost Fagus crenata forest in Japan. Nature of Kagoshima 39: 113-118
  • Matsumura S. and Yamane Sk. 2012. Species composition and dominant species of ants in Jigenji Park, Kagoshima City, Japan. Nature of Kagoshima 38: 99–107
  • Matsumura S., and S. Yamane. 2012. Species composition and dominant species of ants in Jigenji Park, Kagoshima City, Japan. Nature of Kagoshima 38: 99-107.
  • Terayama M., S. Kubota, and K. Eguchi. 2014. Encyclopedia of Japanese ants. Asakura Shoten: Tokyo, 278 pp.
  • Yamane S. 2016. How many species of Ants in Amami Islands? (in Japanese). Part 2, chapter 1 in How many species of Ants in Amami Islands? Pp. 92-132.
  • Yamane S. S. Fukumoto, Y. Maeda, and Y. Sato. 2017. Records of ants from Kakeroma-jima, the Amami Islands, Japan. Bull. Biogeogr. Soc. Japan 71, 131-137.