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Ancyridris polyrhachioides
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Crematogastrini
Genus: Ancyridris
Wheeler, W.M., 1935
Type species
Ancyridris polyrhachioides
2 species
(Species Checklist)

Ancyridris polyrhachioides casent0102469 profile 1.jpg

Ancyridris polyrhachioides

Ancyridris polyrhachioides casent0102469 dorsal 1.jpg

Specimen Label

Beyond the two taxonomic publications that detail the two species in this genus (Ancyridris polyrhachioides and Ancyridris rupicapra), nothing is known about these ants.


The hooked end of the long propodeal spines, curved towards the head, and the rearward bending elongate petiole spines are a distinctive feature of both species of this genus. Beyond this the genus is similar to Aphaenogaster or certain worker forms of Pheidole.


World distribution based on political regions. View/Edit Data
Ancyridris Distribution.png Worlddistribution legend.jpg

Species richness

Species richness by country based on regional taxon lists (countries with darker colours are more species-rich). View Data

Ancyridris Species Richness.png




Worker Morphology

 • Antennal segment count 12 • Antennal club 2-3 • Palp formula 3,2; 2,2 • Total dental count 7-9 • Eyes present • Scrobes absent • Sting present

Male Morphology

 • Caste unknown


The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.

  • ANCYRIDRIS [Myrmicinae: Stenammini]
    • Ancyridris Wheeler, W.M. 1935a: 1. Type-species: Ancyridris polyrhachioides, by original designation.
    • [Ancyridris provisional junior synonym of Lordomyrma: Brown, 1973b: 178 (unconfirmed).]

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


Worker: Monomorphic (?), with hard, thick, smooth integument. Mandibles subtriangular, with distinct and rather long masticatory border bearing a graduated series of about 10 teeth. Palpi short, maxillary pair 4-, labial pair 3-jointed. Head broadly subelliptical, eyes well developed, in front of the middle of its sides; ocelli absent. Clypeus very short laterally, with subobsolete posterior suture, its median portion produced backward triangularly between the frontal carinae, its anterior border with a large, median triangular tooth. Frontal carinae rather closely approximated, feebly lobular in front, straight and subparallel behind; frontal area absent; frontal groove interrupted, subobsolete. Antennae long, 12-jointed; first funicular joint somewhat enlarged, second longer than the third, the tip enlarged, forming an indistinct three- to four- jointed club. Thorax long and narrow, shaped somewhat as in Aphaenogaster, with long and pronounced mesoepinotal impression; promesonotal suture distinct only on the sides, mesoepinotal suture obsolete; pronotum with strong humeral protuberances; mesosternum with a rectangular, laterally projecting tooth near the base of its ventral border; epinotum bearing two long, flattened, hooked spines resembling those of Polyrhachis bamata Drury; epinotal spiracle circular, borne on a distinct crateriform eminence; metasterna swollen, apparently containing voluminous metasternal glands. Petiole long, with well-developed anterior peduncle, its node rather high and bearing a pair of backwardly and outwardly directed spines. Postpetiole short, with rounded-subconical node. Gaster broadly oval, consisting for the most part of the enlarged first segment; sting not exserted, apparently vestigial. Legs long; coxae large and swollen; middle and hind tibiae spurless; tarsal claws simple.


  • Bolton, B. 1994. Identification guide to the ant genera of the world. Cambridge, Mass.: Harvard University Press, 222 pp. (page 106, page 90, Ancyridris as genus)
  • Bolton, B. 1995b. A new general catalogue of the ants of the world. Cambridge, Mass.: Harvard University Press, 504 pp. (page 63, Ancyridris in Myrmicinae, Stenammini)
  • Bolton, B. 2003. Synopsis and Classification of Formicidae. Mem. Am. Entomol. Inst. 71: 370pp (page 202, Ancyridris as genus)
  • Brown, W. L., Jr. 1973b. A comparison of the Hylean and Congo-West African rain forest ant faunas. Pp. 161-185 in: Meggers, B. J., Ayensu, E. S., Duckworth, W. D. (eds.) Tropical forest ecosystems in Africa and South America: a comparative review. Wash (page 178, Ancyridris provisional junior synonym of Lordomyrma (unconfirmed))
  • Stitz, H. 1938. Neue Ameisen aus dem indo-malayischen Gebiet. Sitzungsber. Ges. Naturforsch. Freunde Berl. 1938: 99-122.
  • Wheeler, W. M. 1935a. Two new genera of myrmicine ants from Papua and the Philippines. Proc. N. Engl. Zool. Club 15: 1-9 (page 1, 5, Ancyridris in Myrmicinae, Pheidolini)