Acropyga sauteri

This species has been found in grasslands, the margins of forests and within forests. Nests are under stones as well as in leaf litter and directly in soil. It is a trophophoretic species, associated with the mealybug, a trophobiont (Lapolla, 2004). Nuptial flights have been observed from late March to June with alate females leaving the parent nest with a gravid female Eumyrmococcus in her mandibles (Uye, 1928, 1933; Teranishi, 1929; Terayama, 1988).

Identification
LaPolla (2004) - Worker: 11 segmented antennae; mesosomal dorsum flat with many short erect hairs; pronotum short, rises very steeply toward mesonotum; mandible with 3-4 teeth. Queen: As in worker with modifications expected for caste. Male: 12 segmented antennae; digiti 2.5 times longer than cuspi, with peg-like teeth along sides. Compare with Acropyga lauta.

The worker of this species is fairly easily recognized, with 3-4 teeth and no diastema separating the basal teeth from the other teeth. A. sauteri is currently placed in the myops species-group. The long digiti, similar shaped parameres and dark color of the male suggest a close relationship with Acropyga myops.

Distribution based on Regional Taxon Lists
Oriental Region: Taiwan. Palaearctic Region: China, Japan.

From LaPolla (2004): This species has one of the most northerly distributions in the genus, ranging from Japan south to Macao in southern China.

Nomenclature

 * . Acropyga (Rhizomyrma) sauteri Forel, 1912a: 72 (w.) TAIWAN.
 * Wheeler, W.M. 1928c: 31 (q.); Santschi, 1928b: 36 (q.m.).
 * Status as species: Emery, 1925b: 30; Santschi, 1928b: 36; Wheeler, W.M. 1928c: 31; Wheeler, W.M. 1929g: 62; Wheeler, W.M. 1930h: 75; Teranishi, 1940: 59; Azuma, 1951: 88; Chapman & Capco, 1951: 212; Onoyama, 1980: 199; Morisita, et al. 1991: 14; Wang, C. & Wu, 1992a: 227 (in key); Bolton, 1995b: 58; Terayama, Fellowes & Zhou, 2002: 25 (redescription); Imai, et al. 2003: 83; Lin & Wu, 2003: 62; LaPolla, 2004a: 68; Terayama, 2009: 204; Ran & Zhou, 2011: 66; Guénard & Dunn, 2012: 27.

Worker
LaPolla (2004) - (n=2): TL: 2.16-2.59; HW: 0.527-0.568; HL: 0.561-0.596; SL: 0.413-0.418; ML: 0.681-0.687; GL: 0.909-1.31; CI: 101.25-105.2; SI: 66.67-72.71.

Head: yellow; head covered in layer of short appressed hairs; head about as broad as long; posterior margin slightly concave medially; short erect hairs along posterior margin; 11 segmented, incrassate antennae; scape reaches or slightly surpasses posterior margin; clypeus broad, slightly convex, with many erect hairs on dorsal surface; mandible with 3-4 teeth; apical tooth often much longer than others; when present, 4th tooth smaller and offset from masticatory margin; when with 3 teeth, a small hump present along inner mandibular margin where a 4th tooth would be; gap exists between inner mandibular margin and anterior clypeal margin. Mesosoma: yellow; in lateral view, pronotum with short shelf rising sharply toward mesonotum; pronotum covered with short erect hairs; mesosomal dorsum flat; mesonotum and propodeum at same height; mesonotum and propodeum covered in layer of short erect hairs; metanotal area indistinct; declivity steep. Gaster: petiole thick and erect reaching height of bottom portion of propodeal spriacle; gaster yellow, with thick covering of appressed hairs with scattered erect hairs throughout.

Queen
LaPolla (2004) - (n=1): TL: 3.39; HW: 0.732; HL: 0.619; SL: 0.495; ML: 1.19; GL: 1.58; CI: 118.26; SI: 67.62. As in worker with modifications expected for caste and the following differences: color a brownish-yellow, darker on apex of head, mesosomal and gaster dorsa.

Male
LaPolla (2004) - (n=1): TL: 2.21; HW: 0.5; HL: 0.452; SL: 0.371; ML: 0.819; GL: 0.941; CI: 110.62; SI: 74.2.

Head: yellow to dark brownish-yellow toward apex around 3 promient ocelli; head covered in a layer of short erect hairs; head broader than long; 12 segmented, slightly incrassate antennae; scape surpasses posterior margin by about 112 length of pedicel; clypeus broad, convex medially; mandible with 3-4 teeth; mandibular shape as in worker. Mesosoma: brownish-yellow; pronotum small and collar-like, overarched by mesonotum; dorsum flat with dense layer of short erect hairs; scutellum with longer erect hairs; propodeum long, slightly below level of mesonotum; declivity short and steep. Gaster: petiole thick and erect; gaster brownish yellow, covered in a layer of appressed hairs. Genitalia: in lateral view, parameres long and thin, tapering to rounded apices; cuspi short, nearly straight, with short peg-like teeth at rounded apices; digiti straight, much longer than cuspi (ca. 2.5 times), with short, peg-like teeth along sides toward truncated apices.

Type Material
LaPolla (2004) - Acropyga (Rhizomyrma) sauteri Forel, 1912a: 72 (w.). Syntype workers, TAIWAN: (no specific locality provided) (depository unknown) [not examined]. Wheeler, W.M., 1928: 31, description of queen; Santschi, 1928a: 36, description of queen and male; Terayama et ai., 2002: 25, description and key.

References based on Global Ant Biodiversity Informatics

 * Abe T. 1977. A preliminary study on the ant fauna of the Tokara Islands and Amami-Oshima. Ecol. Stud. Nat. Cons. Ryukyu Isl. 3: 93-102.
 * Abe T., and A. Maeda. 1977. Fauna and density of ants in sugarcane fields of the southern part of Okinawa Island. Pp. 75-91 in: Ikehara, S. (ed.) 1977. Ecological studies of nature conservation of the Ryukyu Islands - (III). Naha, Okinawa: University of the Ryukyus, 202 pp.
 * Azuma M. 1951. On the Myrmecological fauna of Osaka Prefecture, Japan with description of new species (Formicidae, Hymenoptera). Hyogo Biology 1(5): 1-5.
 * Azuma, S. and M. Kinjo. 1987. Family Formicidae, In Checklist of the insects of Okinawa. The Biological Society of Okinawa, Nishihara. Pages 310-312.
 * Blaimer B. B., J. S. LaPolla, M. G. Branstetter, M. W. Lloyd, and S. G. Brady. 2016. Phylogenomics, biogeography and diversification of obligate mealybug-tending ants in the genus Acropyga. Molecular Phylogenetics and Evolution 102: 20-29.
 * 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
 * Forel A. 1912. H. Sauter's Formosa-Ausbeute. Formicidae (Hym.) (Schluss). Entomol. Mitt. 1: 45-61.
 * 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., 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.
 * Guénard B., and R. R. Dunn. 2012. A checklist of the ants of China. Zootaxa 3558: 1-77.
 * Hosoichi S., W. Tasen, S. H. Park. A. Le Ngoc, Y. Kuboki, and K. Ogata. 2015. Annual fire resilience of ground-dwelling ant communities in Hiraodai Karst Plateau grassland in Japan. Entomological Science 18: 254–261.
 * Katayama M., T. Hosoya, and W. Toki. 2013: First survey of ground-dwelling ants (Hymenoptera: Formicidae) on the uninhabitedGaja-jima Island, theRyukyu archipelago, Japan.Entomol. Fennica 24: 216222.
 * LaPolla J.S. 2004. Acropyga (Hymenoptera: Formicidae) of the world. Contributions of the American Entomological Institute 33(3): 1-130.
 * Li Z.h. 2006. List of Chinese Insects. Volume 4. Sun Yat-sen University Press
 * Onoyama K. 1976. A premilinary study on the ant fauna of Okinawa-ken, with taxonomic notes (Japan; Hymenoptera: Formicidae). Ecol. Stud. Nat. Cons. Ryukyu Isl. II: 121-141.
 * Ran H., and S. Y. Zhou. 2011. Checklist of Chinese Ants: the Formicomorph Subfamilies (Hymenoptera: Formicidae) (I). Journal of Guangxi Normal University: Natural Science Edition. 29(3): 65-73.
 * Santschi F. 1928. Nouvelles fourmis de Chine et du Turkestan Russe. Bulletin et Annales de la Société Entomologique de Belgique. 68: 31-46.
 * Terayama M. 1981. Distribution of ants of the Nansei Archipelago. (I) Ants in the Amami Islands. Nature and Insects 16(8): 34-36.
 * Terayama M. 1992. Structure of ant communities in East Asia. A. Regional differences and species richness. Bulletin of the Bio-geographical Society of Japan 47: 1-31.
 * Terayama M. 2009. A synopsis of the family Formicidae of Taiwan (Insecta: Hymenoptera). Research Bulletin of Kanto Gakuen University. Liberal Arts 17:81-266.
 * Terayama M., K. Ogata, and B.M. Choi. 1994. Distribution records of ants in 47 prefectures of Japan. Ari (report of the Myrmecologists Society of Japan) 18: 5-17.
 * Terayama M., S. Kubota, and K. Eguchi. 2014. Encyclopedia of Japanese ants. Asakura Shoten: Tokyo, 278 pp.
 * Terayama M., and S. Kubota. 1994. Ants from Aogashima Island. Ari 17: 11.
 * Terayama M., and S. Kubota. 2002. Ants of Tokyo, Japan. ARI 26: 1-32.
 * Terayama M.; Fellowes, J. R.; Zhou, S. 2002. The East Asian species of the ant genus Acropyga Roger, 1862 (Hymenoptera: Formicidae: Formicinae). Edaphologia 70:21-32.
 * Terayama, M. 2009. A synopsis of the family Formicidae of Taiwan (Insecta; Hymenoptera). The Research Bulletin of Kanto Gakuen University 17: 81-266.
 * Terayama, M., J. R. Fellowes and Zhou S.-Y. 2002. The East Asian species of the ant genus Acropyga Roger, 1862 (Hymenoptera: Formicidae: Formicinae). Edaphologia 70: 21-32
 * Wheeler W. M. 1928. Ants collected by Professor F. Silvestri in China. Bollettino del Laboratorio di Zoologia Generale e Agraria della Reale Scuola Superiore d'Agricoltura. Portici 22: 3-38.
 * Wheeler W. M. 1929. Ants collected by Professor F. Silvestri in Formosa, the Malay Peninsula and the Philippines. Bollettino del Laboratorio di Zoologia Generale e Agraria della Reale Scuola Superiore d'Agricoltura. Portici 24: 27-64.
 * Wheeler W. M. 1930. A list of the known Chinese ants. Peking Natural History Bulletin 5: 53-81.
 * 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. Ikudome, and M. Terayama. 1999. Identification guide to the Aculeata of the Nansei Islands, Japan. Sapporo: Hokkaido University Press, xii + 831 pp. pp, 138-317.
 * Yamane S., Y. Harada, and K. Eguchi. 2013. Classification and ecology of ants. Natural history of ants in Southern Kyushu. 200 pages
 * Yamane S.; Ikudome, S.; Terayama, M. 1999. Identification guide to the Aculeata of the Nansei Islands, Japan. Sapporo: Hokkaido University Press, xii + 831 pp. pp138-317.
 * Yamane, S.; Iwai, T.; Watanabe, H.; Yamanouchi, Y. 1994. Ant fauna of the Tokara Islands, northern Ryukyus, Japan (Hymenoptera, Formicidae). WWF (Worldwide Fund for Nature) Japan Science Report 2(2):311-327.