DuBois (1986) - This species was discovered in a nest of Monomorium minimum. It is presumed to be a social parasite in view of the morphological features it shares with other species of inquilinous Monomorium (see section on inquilinism). This species has only been collected once (almost 100 years ago), and is probably now extinct. One detail recorded, and perpetuated through the literature (i.e., Wheeler, 1910: 498; Creighton, 1950: 239-241), was that when the colony containing M. pergandei was taken to the laboratory, Pergande noted that reproductive of M. minimum were also present in the nest. As he watched, the M. pergandei females attacked and killed some of the M. minimum males. This seems rather unusual behavior if the reproductives of the two species coexisted previously in the same nest. However, Wheeler (1910: 498) points out that Pergande may have collected two colonies in close proximity to each other, with one colony containing M. pergandei reproductives and M. minimum workers, while the other colongy contained M. minimum reproductives. Wheeler then supposed these two colonies were combined in the laboratory and the observed behavior ensued.
|At a Glance||• Workerless Inquiline|
- 1 Identification
- 2 Distribution
- 3 Biology
- 4 Castes
- 5 Nomenclature
- 6 References
DuBois (1986) - A member of the Monomorium minimum species group. Queen Winged; scutum and scutellum convex; metanotum (in lateral view) projecting above level of propodeum and scutellum; propodeum angular; clypeus emarginate, teeth blunt and reduced; anterior edge of scutum projecting over pronotum.
Monomorium pergandei is easily recognized by the small size of the female (compared to the size of the host), the smooth and shining integument, the abundance of erect to suberect setae over most of the body, the spine projecting where the postpetiolar process is usually located, and the large depression on the dorsum of the first gastral tergite. Females of this species are most similar to Monomorium inquilinum. However, these two species can easily be separated, since the metanotum only projects to the level of the propodeum and scutellum and there are only two mandibular teeth in M. inquilinum. The petiolar node is flat and the anterior edge of the scutum does not project over the pronotum in M. inquilinum. These same characters distinguish females of M. talbotae, which also lack a dorsal impression on the first gastral tergite.
Keys including this Species
- Key to Monomorium males of the New World
- Key to Monomorium queens of the New World
- Key to Monomorium workers of the New World
- Key to US Monomorium species
Washington D.C., USA.
Distribution based on Regional Taxon Lists
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.
- pergandei. Epoecus pergandei Emery, 1893a: cclxxvi (q.m.) U.S.A. [Also described as new by Emery, 1895c: 273, pl. 8, figs. 11, 12.] Combination in Monomorium: Ettershank, 1966: 91. See also: DuBois, 1986: 113; Bolton, 1987: 299.
Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.
DuBois (1986) - As described for Monomorium talbotae except as follows. Head. (representing type locality; N= 2) HL 0.44-0.48 (0.46), HW 0.39-0.40 (0.40), SL 0.40-0.42 (0.41), IOD 0.09-0.10 (0.10), OD 0.04-0.05 (0.04), EL 0.09-0.10 (0.10), MOD 0.08-0.09 (0.08). Structure—CI 83-89 (86), SIL 88-90 (89), SIW 103-105 (104). Scape surpassing occiput by an amount slightly greater than length of pedicel. Mandible with three teeth. Clypeal teeth blunt, short. Alitrunk: PW 0.30-0.33 (0.32), PL 0.22-0.28 (0.25), WL 0.72-0.81 (0.76). Structure—Mesonotum with small notal furrow. Scutum and scutellum not depressed. Anterior edge of scutum projecting over pronotum. Mesopleural suture deflected dorsally at posterior end and ventrally at anterior end; small pit at each end. Metanotum (in lateral view) projecting above level of propodeum and scutellum. Propodeum angular. PI 30-35 (32). Petiole: Dorsum of node flat, smooth and shining with small piliferous punctures. Remaining surfaces covered with moderately dense, non-piliferous punctures. Postpetiole. Dorsum of node weakly emarginate. Gaster. As in M. minimum except as follows: first gastral tergite with basal depression. Color. Head brown to dark brown except as follows: mandible and antenna yellow brown to yellow. Alitrunk brown, legs yellow brown to yellow. Petiole, postpetiole, and gaster brown. All setae white.
DuBois (1986) - Although males and females of M. pergandei were collected from the same nest, no male specimens could be located for this study. One badly damaged specimen (gaster missing) is labelled as a male in the NMNH collection. The head and alitrunk resemble those of a female. This may actually be a male if the sexes in M. pergandei are as similar as they are in M. talbotae.
DuBois (1986) - Type series consisting of lectotype and 6 paralectotype queens, designated by DuBois (1981a): District of Columbia: Washington, 12 July (year unknown but before 1892), T. Pergande. Lectotype and 4 paralectotypes in National Museum of Natural History, remaining paralectotypes in Museum of Comparative Zoology. All specimens bear red, handwritten labels: Monomorium pergandei Lectotype (or Paralectotype) M. DuBois 1980.
- Bolton, B. 1987. A review of the Solenopsis genus-group and revision of Afrotropical Monomorium Mayr (Hymenoptera: Formicidae). Bull. Br. Mus. (Nat. Hist.) Entomol. 54: 263-452 (page 299, see also)
- DuBois, M. B. 1986. A revision of the native New World species of the ant genus Monomorium (minimum group) (Hymenoptera: Formicidae). University of Kansas Science Bulletin. 53(2):65-119. PDF
- Emery, C. 1893c . [Untitled. Introduced by: "M. C. Emery, de Bologne, envoie les diagnoses de cinq nouveaux genres de Formicides".]. Ann. Soc. Entomol. Fr. (Bull.) 61:cclxxv-cclxxvii. (page cclxxvi, queen, male described)
- Emery, C. 1895d. Beiträge zur Kenntniss der nordamerikanischen Ameisenfauna. (Schluss). Zool. Jahrb. Abt. Syst. Geogr. Biol. Tiere 8: 257-360 (page 273, also described as new)
- Ettershank, G. 1966. A generic revision of the world Myrmicinae related to Solenopsis and Pheidologeton (Hymenoptera: Formicidae). Aust. J. Zool. 14: 73-171 (page 91, Combination in Monomorium)