Acanthostichus bentoni

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Acanthostichus bentoni
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Dorylinae
Genus: Acanthostichus
Species: A. bentoni
Binomial name
Acanthostichus bentoni
Mackay, W.P., 1996

Acanthostichus bentoni casent0281971 p 1 high.jpg

Acanthostichus bentoni casent0281971 d 1 high.jpg

Specimen Labels

The type specimens were collected early in the morning in the reserve belonging to the Biological Dynamics of Forest Fragments Project (Smithsonian Institution / World Wildlife / Instituto Nacional de Pesquisas da Amazonia (INPA) Collaborative Project). This reserve is a very large patch of continuous forest and is often referred to by the project participants as “41” reserve (Benton. pers. comm.). Dr. Benton observed a short trail (at most about 1 m long) at night, emerging from a hole in sandy soil in a forest clearing in which the main camp site of the “41” reserve is situated. At the end of the trail the ants were feeding on small pieces of cut earthworm. Dr. Benton was not certain the ants had killed the earthworm or were merely opportunist scavengers. (Mackay 1996)


A member of the serratulus species complex. Mackay (1996) - This species could be confused with Acanthostichus lattkei. It can be easily separated based on three good characters: the anterior half of the head is finely striate or costulate (anterior fourth of head of A. lattkei is similar, but more finely sculptured), the anterior medial tooth of clypeus is absent (present in A. lattkei and the medial border is strongly and deeply excised (Fig. 7), and the top of the petiole is fmally punctate (lightly longitudinally striate in A. lattkei. The petiole is not quadrate with carinae on the lateral edges as in A. quadratus. It differs from A. serratulus as there are no carinae on the lateral edges of the petiole. The excised clypeal border easily separates it from workers of essentially all other species.

Keys including this Species


Mate Grosso, Brazil

Latitudinal Distribution Pattern

Latitudinal Range: -2.983333333° to -3.10194°.

Tropical South

Distribution based on Regional Taxon Lists

Neotropical Region: Brazil (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.




Known only from the worker caste.


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

  • bentoni. Acanthostichus bentoni Mackay, 1996: 143, fig. 7 (w.) BRAZIL (Amazonas, Mato Grosso).
    • Type-material: holotype worker, 2 paratype workers.
    • Type-locality: holotype Brazil: Amazonas, ZF3, km. 41, Res. 41 WWF, 7.viii.1991 (F. Benton); paratypes with same data.
    • [Note: other specimens from type-series in BMNH.]
    • Type-depositories: INPA (holotype); CPDC, MCZC (paratypes).
    • Distribution: Brazil.

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



Mackay 1996. Figures 1-10.

Worker (holotype in parentheses): HL (1.10)-1.14, HW (l.06)-1.14, SL (0.61)-0.64, EL 0.03-(0.05), WL (1.48)-1.58, PW (0.53)-0.54, PL (0.45)-0.53, SI 56 (56), CI (97)-100, PI (86)-98, SL/SW (3.20)-3.47.

Mandibles toothless, apex pointed; anterior border of clypeus strongly excised between bases of frontal carinae (Fig. 7), lateral teeth moderately well formed (Fig. 7); head slightly narrowed posteriorly; vertex slightly, but broadly concave; eyes small, 4-6 poorly defined ommatidia; scape with concave anterior border, not unusually thickened; mesosoma as in others in the species complex; propodeum concave posteriorly, poorly defined tubercles on each comer, united with a weakly defined carina; petiole wider than long, anterior face strongly concave, subpetiolar process large with posteriorly directed point, as others in the complex; gaster as in other species. Sculpture mostly smooth and polished, except the anterior half of the head is rough and costulate, dorsum of petiole finely punctate. Hairs long (over 0.5mm), erect, golden, abundant on most surfaces; decumbent pubescence lacking. Reddish brown, gaster somewhat lighter in color.

Type Material

Type series. Brazil. Amazonas. ZF3. Km41. Res. 41 WWF. 7-viii-1991. F. Benton leg. Holotype worker (Instituto Nacional de Pesquisas da Amazonia) and two paratype workers (Museum of Comparative Zoology, Laboratório de Mirmecologia CEPEC / CPDC). Forbes Benton gave additional specimens from the series to Barry Bolton, which are presumably in the British Museum. The series was collected in Reserve 1501 at km 41 of the ZF-3 road which joins the BR 174 Boa Vista - Manaus Highway at km 64 (64 km N Manaus).


Named in honor of the collector of the type specimens. Dr. Forbes Benton. The specimens were forwarded to me by Dr. Ana Harada.


References based on Global Ant Biodiversity Informatics

  • Instituto Nacional de Pesquisas de Amazonia (GBIF)