Pseudomyrmex crudelis

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

Pseudomyrmex crudelis casent0902863 p 1 high.jpg

Pseudomyrmex crudelis casent0902863 d 1 high.jpg

Specimen Labels

Known only from Tachigali growing in the western foothills of the Amazon basin. Workers keep pseudococcids as well as brood in the Tachigali domatia, and they are as aggressive in the defense of their nest sites as species in the P. viduus group (Ward 1999).


Ward (1999) - Workers and queens of P. crudelis are distinguished from other species in the sericeus group by the combination of medium size (worker HW 1.00–1.13, queen HW 1.13–1.22), relatively narrow worker head, and broad, subtrapezoidal petiole (worker DPW/HW 0.39–0.42, queen DPW/HW 0.49–0.52). The mesonotum of the male has an unusual anteromedial protrusion, not seen in any other Pseudomyrmex species.


Distribution based on Regional Taxon Lists

Neotropical Region: Peru (type locality).

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb




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

  • crudelis. Pseudomyrmex crudelis Ward, 1999b: 516, figs. 45, 54, 63 (w.q.m.) PERU.

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



Measurements (n=10) HL 1.20–1.29, HW 1.00–1.13, MFC 0.024–0.053, LHT 0.81–0.93, CI 0.83–0.89, REL 0.59–0.62, REL2 0.68–0.73, FCI 0.02–0.05, FI 0.43–0.47, PLI 1.01–1.13, PWI 0.91–1.03.

A member of the sericeus group. Palp formula 6,4 (rarely 6p5,4). Frontal carinae moderately separated; eyes of short to medium length for the species group (see REL values). Head relatively elongate (CI < 0.90), the sides only weakly convex, the posterior margin slightly to moderately concave, in full-face view. Profemur moderately slender. Dorsal face of propodeum subequal in length to declivitous face, in profile the two faces meeting at a rounded angle. Petiole high and broad, with more or less differentiated anterior and dorsal faces, dorsal face rounding into steep posterior face. Anteroventral petiolar process prominent, with posteriorly-directed tooth. Standing pilosity sparse, typically one pair of long stout setae on the pronotal humeri, petiole and postpetiole, rarely on the propodeum. Dark brownish-black, the appendages lighter; mandibles, frontoclypeal complex and protibia yellowish-brown.

Type Material

Holotype worker. PERU, San Martın: 24 km NNE Tarapoto, 6°18'S, 76°16'W, 220 m, 23.viii.1986, ex Tachigali, P. S. Ward# 8705 (Museum of Comparative Zoology). HW 1.05, HL 1.24, EL 0.75, LHT 0.88, PL 0.45, PH 0.47.

Paratypes. Same data as holotype: series of workers queens, males (The Natural History Museum, Los Angeles County Museum of Natural History, MCZC, Museo de Historia Natural, Museu de Zoologia da Universidade de Sao Paulo, Philip S. Ward Collection, University of California, Davis).


  • 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 516, figs. 45, 54, 63 worker, queen, male described)