Pseudomyrmex satanicus

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Pseudomyrmex satanicus
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Pseudomyrmecinae
Genus: Pseudomyrmex
Species group: ferrugineus
Species: P. satanicus
Binomial name
Pseudomyrmex satanicus
(Wheeler, W.M., 1942)

Pseudomyrmex satanicus casent0005799 profile 1.jpg

Pseudomyrmex satanicus casent0005799 dorsal 1.jpg

Specimen labels


Ward (1993) - The foregoing diagnosis will allow discrimination of P. satanicus workers from those of the closely related Pseudomyrmex spinicola; queens can be recognized by size alone (HL > 1.65, HW > 1.20). P. satanicus can be distinguished from the remaining members of the P. ferrugineus group by the emarginate, laterally angulate median clypeal lobe of the worker and the large size of the queen.


Costa Rica and Panama.

Latitudinal Distribution Pattern

Latitudinal Range: 9.357° to 9°.

Tropical South

Distribution based on Regional Taxon Lists

Neotropical Region: Costa Rica, Panama (type locality).

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb


Ward (1993) - P. satanicus is a forest species restricted to a few localities in central Panama where its host plant, Acacia melanoceras, grows. Both the ant and plant are intolerant of forest clearance and are considered vulnerable to extinction (Janzen 1974). The ant is polygynous, with 5-20 or more queens per colony, and the workers are particularly aggressive, even for acacia-ants (Wheeler 1942; Janzen 1974). See Janzen (1974:43-53) for additional details on P. satanicus and its host plant.



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

  • satanicus. Pseudomyrma satanica Wheeler, W.M. 1942: 174, pl. 47, fig. b (w.q.m.) PANAMA. Combination in Pseudomyrmex: Kempf, 1972a: 223. See also: Ward, 1993: 149.

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



Ward (1993) - measurements (n=15). —HL 1.16-1.36, HW 1.10-1.26, MFC 0.035-0.057, CI 0.90-0.97, REL 0.45-0.50, REL2 0.48-0.52, OOI 0.92-1.67, VI 0.69-0.78, FCI 0.030-0.049, SI 0.45-0.49, SI2 0.88-1.00, NI 0.63-0.68, PLI 0.47-0.54, PWI 0.46-0.63, PPWI 1.35-1.54.

Similar to Pseudomyrmex spinicola (q.v.) except as follows. Larger (HW > 1.09), head broader (CI > 0.88) with straight or slightly concave posterior margin and subangulate posterolateral corners. (The posterior margin of the head approaches this condition in some P. spinicola workers but these have much smaller, more elongate heads, HW < 1.10, CI < 0.90.) Median clypeal lobe narrower (CLW/HW 0.20-0.22). Palp formula 4,3. Head with pronounced pit-like impression below the median ocellus (absent or poorly developed in P. spinicola). Metanotal groove better developed, longer. Petiole tending to be more slender, with less distinct posterolateral corners (this characteristic seen in some workers of P. spinicola, especially individuals from Panama). Body pubescence averaging thicker than in P. spinicola. Dark brown in color, mandibles and appendages lighter.

Type Material

Ward (1993) - Syntype workers, queen, male, Rio Agua Salud, Canal Zone, Panama (W. M. Wheeler) (American Museum of Natural History, Los Angeles County Museum of Natural History, Museum of Comparative Zoology) [Examined]. One MCZC syntype worker here designated LECTOTYPE.


References based on Global Ant Biodiversity Informatics

  • Ward, P.S. 1993. Systematic studies on Pseudomyrmex acacia-ants (Hymenoptera: Formicidae) Journal of Hymenoptera Research 2(1):117-168
  • Wheeler W. M. 1942. Studies of Neotropical ant-plants and their ants. Bulletin of the Museum of Comparative Zoology 90: 1-262.