Pheidole mooreorum

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Pheidole mooreorum
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Pheidole
Species: P. mooreorum
Binomial name
Pheidole mooreorum
Wilson, 2003

Pheidole mooreorum jtlc000007344 profile 1.jpg

Pheidole mooreorum jtlc000007344 dorsal 1.jpg

Specimen labels


This species occurs in a wide variety of habitats: dry forest, rainforest, and cloud forest, from sea level to 1800m elevation, in disturbed synanthropic habitats or less disturbed forest with intact canopy. It can be locally common. Collections are most often from baits on forest floor, or scattered workers in Winkler samples. Major workers are often recruited to baits along with minor workers. The types of P. fariasana were from a nest found beneath a stone. (Longino 2009)


See the description in the nomenclature section.

Keys including this Species


Mexico (Tamaulipas) to Costa Rica (northern Pacific lowlands and northern cordilleras).

Distribution based on Regional Taxon Lists

Neotropical Region: Belize, Costa Rica, Guatemala, Honduras, Mexico (type locality), Nicaragua.

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.

  • fariasana. Pheidole fariasana Wilson, 2003: 155, figs. (s.w.) MEXICO. Junior synonym of mooreorum: Longino, 2009: 56.
  • mooreorum. Pheidole mooreorum Wilson, 2003: 209, figs. (s.w.) MEXICO. Senior synonym of fariasana: Longino, 2009: 56.

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

Longino (2009) - Over the range of the species there is strong intra- and inter-populational variation. Minor workers: the pronotum may be entirely and strongly foveolate (rarely), it may show a patchwork of foveolate sculpture and smooth shiny areas, or it may be completely smooth and shining. Correlated with this is face sculpture, which is usually completely smooth and shining, but in forms with more sculpture on the promesonotum the face may have very faint patches of foveolate sculpture. Major worker: in general the anterior face has longitudinal rugulae with smooth shiny interspaces, and the posterior face is completely smooth and shining. The transition may occur abruptly or gradually, and from just anterior to the level of the compound eyes to somewhat posterior to them. The medial area between the frontal carinae may be completely smooth and shining, or with variable numbers of longitudinal rugulae parallel to and beginning at the frontal carinae and fading medially. The strength and extent of face rugulae correlates with strength of pronotal sculpture on minor workers. The setae projecting from the side of the head in face view vary from long and suberect to short and appressed.

The minor workers of the type series of P. fariasana from Tamaulipas have the intermediate sculptural condition, in which the pronotum is mostly smooth and shining, with a narrow band of foveolate sculpture at the anterior margin and wrapping around onto the ventrolateral margin. The major workers have the face rugulae extending posterior to the compound eyes, and there are abundant suberect setae projecting from the side of the head. In the Sierra Madre de Chiapas, most collections have the intermediate sculptural condition, but the full range of variation occurs. At lower elevations in northern Chiapas, in wet forest areas from 500–1000m, the most common condition is for the pronotum of the minor worker to be almost to entirely smooth and shiny, and the side of the head in the major worker with shorter, more decumbent setae. The type series of P. mooreorum, from Veracruz, matches this lowland form, with the setae on the side of the head even more reduced than on the lowland Chiapas material.

One minor worker from a 500m site in northern Chiapas (Metzabok) and one minor worker from a lowland site in the Lacandon rainforest of northern Chiapas (Playón de la Gloria) have a faint purple sheen, like Pheidole purpurea. Unlike P. purpurea, the pronotum is smooth and shining. These collections do not have associated majors, and given the similarity of minor workers of P. mooreorum and P. purpurea, these may be variants of P. purpurea instead of P. mooreorum.

Sparse minor worker collections from montane sites in Guatemala, and multiple collections with major workers from lowland dry forest habitat in northwestern Costa Rica are, on average, like the type series of P. fariasana. Occasionally the sculpture is more extensive. In some lighting conditions the Costa Rican material may have a very faint purple sheen.

In the Cordillera de Tilarán in Costa Rica, in moist forest around 1400m elevation, a relatively uniform population occurs in which the minor workers have a strongly sculptured pronotum, and the minor workers are somewhat bicolored, with mesosoma light brown and head and gaster darker brown.

In Chiapas, Mexico, P. mooreorum is broadly sympatric with P. purpurea, with the former being more abundant in middle to high elevations and the latter relatively more abundant in the lowlands. The minor workers are indistinguishable in the Sierra Madre de Chiapas, where both have an intermediate sculptural condition on the minor worker pronotum and neither have the purple sheen. In the Chiapas lowlands they are more differentiated, with P. mooreorum having a smooth pronotum and no purple sheen, and P. purpurea having a sculptured pronotum and often a purple sheen.

Given the high degree of morphological variability, it is likely that P. mooreorum will resolve into multiple cryptic species.


A member of the diligens group, similar in various characters to Pheidole coffeicola, Pheidole davidsonae, Pheidole gagates, Pheidole hoelldobleri, Pheidole peregrina, Pheidole spilota, Pheidole venatrix and Pheidole zelata, distinguished as follows.

Major: head and body overall richly pilose; sides of head in full-face view relatively straight and parallel; mesonotal convexity prominent, its apex seen from the side tilted forward; humerus in dorsal-oblique view lobose, and pronotum weakly bilobose; postpetiole elliptical from above; rugoreticulum absent from head, and carinulae absent from frontal lobes.

Minor: occiput narrowed, with nuchal collar; dorsal promesonotal profile in dorsal-oblique view smoothly rounded; head and body abundantly pilose.

MEASUREMENTS (mm) Holotype major: HW 1.12, HL 1.24, SL 0.86, EL 0.20, PW 0.62. Paratype minor: HW 0.66, HL 0.78, SL 0.94, EL 0.14, PW 0.44.

COLOR Major: head and body rich medium reddish brown, appendages light reddish brown.

Minor: head and body plain dark brown; appendages light to yellowish brown except for tarsi, which are yellow.

Pheidole mooreorum Wilson 2003.jpg

Figure. Upper: holotype, major. Lower: paratype, minor. Scale bars = 1 mm.

Type Material

Longino (2009):

Holotype major worker and associated paratype minor worker: Mexico, Veracruz, Los Tuxtlas, 10km NNW Sontecomapan, 18°35'N 95°05'W, 200m, 20 Mar 1985, ground foragers, rainforest (P. S. Ward 7339) Museum of Comparative Zoology (examined).

Pheidole fariasana Holotype major worker and associated paratype minor worker: Mexico, Tamaulipas, 1 mi E Gomez Farias, 1400', 23 Dec 1972, deciduous tropical forest, nesting in ground under stone (R. J. Hamton, A. B. Hamton, B. S. Ikeda) MCZ (examined).


Named in honor of Gordon and Betty Moore, in recognition of their outstanding contribution in service and support to tropical conservation, hence the habitats in which the Pheidole ants will continue to exist.