Acropyga hystrix

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Acropyga hystrix
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Formicinae
Tribe: Plagiolepidini
Genus: Acropyga
Species: A. hystrix
Binomial name
Acropyga hystrix
LaPolla, 2004

Acropyga hystrix casent0903179 p 1 high.jpg

Acropyga hystrix casent0903179 d 1 high.jpg

Specimen Labels

A nest was found in the soil under a log, but otherwise nothing is known of this species' natural history.


LaPolla (2004) - Worker: 11 segmented antennae; mandible with 6-7 teeth; pronotal and mesonotal dorsa with long erect hairs and a thinner layer of short erect hairs. Queen: As in worker with modifications expected for caste. Male: 12 segmented antennae; parameres broad, tapered to a sharp medial point, with many scattered erect hairs; mandible with 6 teeth. Compare with Acropyga acutiventris and Acropyga gelasis.

This species can be distinguished from Acropyga acutiventris by the lack of ridges on the surface of the mandible, and from Acropyga gelasis by not possessing a prominent "beak-like" median portion of the clypeus. Additionally, the erect mesosomal hairs of A. hystrix are longer than those of A. gelasis. Overall, this species, along with A. gelasis, is darker and with less pilosity than most other Acropyga species.

Keys including this Species


Distribution based on Regional Taxon Lists

Indo-Australian Region: Borneo (type locality), Indonesia, Malaysia.

This species is known only from Sarawak on Borneo.

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.






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

  • hystrix. Acropyga hystrix LaPolla, 2004a: 63, figs. 26, 43 (w.q.m.) BORNEO (East Malaysia: Sarawak).
    • Status as species: Pfeiffer, et al. 2011: 36.

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

LaPolla (2004) - The species' placement within the myops species-group is based on the fact that A. hystrix workers possess widely separated torulae, and by the fact that the reproductives are very dark (dark brown to black), as are the reproductives of Acropyga myops. The mandibles of this species are similar to A. myops.



(n=6): 2.24-2.69; HW: 0.543-0.647; HL: 0.607-0.665; SL: 0.511-0.549; ML: 0.596-0.7; GL: 0.964-1.33; CI: 89.46-96.68; SI: 82.53-90.98.

Head: brownish-yellow; darker brownish-yellow toward apex; head slightly longer than broad; posterior margin entire, with distinct long erect hairs scattered throughout; 11 segmented, incrassate antennae; scape reach or surpasses posterior margin by approximately length of pedicel; scape with erect hairs scattered throughout length; clypeus broad and wide, convex medially, with scattered erect hairs throughout; mandible broad, with 6-7 teeth; 3rd tooth from apical usually smaller than others; if with 7 teeth, 7th tooth at meeting of inner mandibular margin and masticatory margin, often smaller than other teeth. Mesosoma: brownish-yellow; in lateral view, pronotum rises steeply toward mesonotum; mesonotum with sparse covering of appressed hairs, long erect hairs posteriorly; mesonotum rounded, slightly higher than level of propodeum, with distinct long, erect hairs on dorsum; metanotal area distinct; propodeal dorsum flat, with sparse short appressed to erect hairs; declivity steep. Gaster: petiole thick and erect, reaching height of propodeal spiracle; gaster brownish-yellow; gaster dorsum slightly darker than venter; covered in layer of short, appressed hairs, though shinier than most other species; scattered erect hairs throughout.


(n=2): TL: 3.99-4.00; HW: 0.803-0.813; HL: 0.782-0.799; SL: 0.743; ML: 1.22-1.27; GL: 1.95-1.97; CI: 101.75-102.69; SI: 91.39-92.53. As in worker with modifications expected for caste and the following differences: color much darker than observed in worker, becoming almost black.


(n=1): TL: 2.68; HW: 0.504; HL: 0.514; SL: 0.415; ML: 0.978; GL: 1.19; CI: 98.05; SI: 82.34.

Head: brownish-yellow; darker toward apex around 3 prominent ocelli; covered in layer of appressed hairs; longer, erect hairs along posterior margin; head about as broad as long; posterolateral comers rounded, giving head an overall round appearance; 12 segmented, slightly incrassate antennae; scapes surpass posterior margin by about length of first 3 funicular segments; clypeus broad, convex medially; mandible broad with 6 teeth; inner mandibular margin parallel with anterior clypeal margin. Mesosoma: brownish-yellow; pronotum small and collar-like, overarched by mesonotum; mesosomal dorsum with appressed hairs and scattered erect hairs; propodeum wide, sloping with an indistinct declivity. Gaster: petiole thick and erect; gaster brownish-yellow, covered in layer of appressed hairs with scattered erect hairs throughout. Genitalia: in lateral view, parameres broad, tapered to short medial points at midheight, with many scattered erect hairs; cuspi taper toward apices with peg-like teeth; cuspi slightly bent toward digiti; digiti erect, thick and apically truncated, with short, peg-like teeth on apices where they meet with cuspi.

Type Material

Holotype worker, MALAYSIA: Sarawak, 4th Div., G. Mulu National Park, RGS Expedition, Long Pala, lowland rainforest under a log (B. Bolton) (The Natural History Museum); 14 paratype workers, paratype queens, paratype males (BMNH) (Museum of Comparative Zoology). The holotype is labeled JSL TYPE # 110.


The specific epithet hystrix is Greek for porcupine in reference to the long, stout erect hairs on the mesosoma.


References based on Global Ant Biodiversity Informatics

  • LaPolla J.S. 2004. Acropyga (Hymenoptera: Formicidae) of the world. Contributions of the American Entomological Institute 33(3): 1-130.
  • 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