Pseudomyrmex insuavis

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Pseudomyrmex insuavis
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Pseudomyrmecinae
Genus: Pseudomyrmex
Species: P. insuavis
Binomial name
Pseudomyrmex insuavis
Ward, 1999

Pseudomyrmex insuavis casent0902889 p 1 high.jpg

Pseudomyrmex insuavis casent0902889 d 1 high.jpg

Specimen Labels

Known only from a few collections.


Ward (1999) - The posterolaterally expanded petiole (worker PWI > 0.91, queen PWI ≈ 0.79) distinguishes P. insuavis from its close relatives Pseudomyrmex concolor and Pseudomyrmex penetrator (worker PWI < 0.91, queen PWI < 0.74). A broad petiole is also seen in some workers of Pseudomyrmex malignus but P. insuavis differs from that species by the conspicuous erect hairs on the sides and posterior margin of the head, by the more abundant pilosity on the mesosoma and legs (compare MSC and HTC values), by the less well separated antennal insertions, and by the shape of the median clypeal lobe (ventrally deflected and laterally rounded in P. insuavis).


Distribution based on Regional Taxon Lists

Neotropical Region: Colombia (type locality).

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb


Ward (1999) - P. insuavis is known only from a few localities in the western Amazon basin. Greg Gangi’s collections came from plants identified as Tachigali cf. formicarum Harms, Tachigali hypoleuca (Bentham) Zarucchi & Herendeen, Tachigali paniculata and Tachigali cf. poeppigiana.



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

  • insuavis. Pseudomyrmex insuavis Ward, 1999b: 492, figs. 10, 21, 32, 136, 152 (w.q.) COLOMBIA.

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



Measurements (n=11). HL 1.01–1.14, HW 0.94–1.06, MFC 0.101–0.128, LHT 0.73–0.86, CI 0.89–0.94, REL 0.36–0.39, REL2 0.38–0.41, FCI 0.11–0.13, SI 0.41–0.43, FLI 1.04–1.38, FI 0.38–0.41, PLI 0.91–1.00, PWI 0.92–1.04, PPWI 1.53–1.69.

Very similar to Pseudomyrmex concolor, except as follows. Petiole shorter, and broader posteriorly; PWI > 0.91 (< 0.91 in P. concolor); PWI3 0.44–0.51 (0.51–0.59 in P. concolor); PLI2 0.87–0.99 (0.79–0.93 in P. concolor). As in P. concolor, standing pilosity is conspicuous on the head, mesosoma, petiole, postpetiole, gaster and legs (MSC 31–66, HTC 8–15). Appressed pubescence on abdominal tergite IV variable, the hairs separated by more than their lengths in some workers, and the area correspondingly more shiny. Body colour much more variable than in P. concolor, ranging from concolorous yellow- or orange-brown to dark brown; also intermediate bicoloured conditions with the head and/or (mesosoma + petiole + postpetiole) and/or abdominal segment IV (first gastric segment) lighter in color than the remainder of the body (such variation can be seen within single nest series).

Type Material

Holotype worker. COLOMBIA, Amazonas: Araracuara [0°38’S, 72°15’W] .iv. 1994, G. Gangi#223, ex Tachigali cf. poeppigiana (Museo de Historia Natural). HW 1.00, HL 1.08, EL 0.39, LHT 0.79, PL 0.46, PH 0.46.

Paratypes. Same locality as holotype, iii–ix. 1994, G. Gangi acc. nos. 11, 20, 177, 185, 223, 224, 269, and 439: Series of workers, 1 queen (to be deposited in BMNH, FFIC, Instituto Nacional de Pesquisas da Amazonia, Instituto de Zoologia Agricola, Los Angeles County Museum of Natural History, Museum of Comparative Zoology, MECN, Museu Paraense Emilio Goeldi, Museo de Historia Natural, Museu de Zoologia da Universidade de Sao Paulo, Philip S. Ward Collection, Museo de Zoologia, University of California, Davis, UCNB.


  • Ward, P. S. 1999b. Systematics, biogeography and host plant associations of the Pseudomyrmex viduus group (Hymenoptera: Formicidae), Triplaris- and Tachigali-inhabiting ants. Zool. J. Linn. Soc. 126: 451-540 (page 492, figs. 10, 21, 32, 136, 152 worker, queen described)