Pheidole mackayi

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

Pheidole mackayi jtlc000007339 profile 1.jpg

Pheidole mackayi jtlc000007339 dorsal 1.jpg

Specimen labels

This species occurs in disturbed habitats in seasonally dry climates, from 700-1400m elevation. The few collections, minor and major workers, have been from baits. The type colony was collected at a bait in a cut and burned-over forest area. (Wilson 2003, Longino 2009)

Identification

See the description in the nomenclature section.

Keys including this Species

Distribution

Chiapas.

Distribution based on Regional Taxon Lists

Neotropical Region: Mexico (type locality).

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Castes

Worker

Minor

Major

Nomenclature

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

  • mackayi. Pheidole mackayi Wilson, 2003: 448, figs. (s.w.) MEXICO. See also: Longino, 2009: 52.

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

Description

DIAGNOSIS Similar in various traits to Pheidole cerina, Pheidole hizemops, Pheidole micon, Pheidole tachirana and Pheidole tenebra, differing as follows.

Major: dark brown; in side view, promesonotal profile almost straight until it drops off posteriorly in a nearly vertical face to the metanotum; pronotum in dorsal-oblique view bilobous, and mesonotal convexity subangulate; eyes relatively large; propodeal spines curve backward; postpetiole from above diamond-shaped; posterior half of dorsal head surface smooth with widely scattered foveae. Minor: eye very large, almost circular, set well forward on head; propodeal spines reduced to denticles; occiput narrowed, its margin concave, lacking nuchal collar.

MEASUREMENTS (mm) Holotype major: HW 0.84, HL 0.86, SL 0.52, EL 0.12, PW 0.44. Paratype minor: HW 0.40, HL 0.44, SL 0.36, EL 0.08, PW 0.24. COLOR Major: body dark, almost blackish brown; appendages light brown.

Minor: body and antennae medium brown, legs yellow.


Pheidole mackayi Wilson 2003.jpg

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

Longino (2009) discovered the type collection was a mixed series that included ''Pheidole janzeni and he redescribed Pheidole mackayi :

Worker

Minor Measurements (n=1): HL 0.60, HW 0.51, SL 0.65, HLA 0.21, EL 0.13, ML 0.73, PSL 0.05, PMG 0.02, SPL 0.02, PTW 0.11, PPW 0.16, CI 85, SI 126, PSLI 9, PMGI 4, SPLI 4, PPI 146.

Mandible roughened, dull at base, grading to smooth and shiny near masticatory margin; clypeus strongly convex, largely smooth and shining with 2–4 longitudinal rugulae; face largely smooth and shiny, with faint foveolate sculpture between frontal carina and compound eye, extending posterior to compound eye on side of head, small irregular patches of faint fovelate sculpture elsewhere; margin of vertex flattened posteriorly; occipital carina narrow, barely visible in full face view; scape foveolate, with abundant decumbent setae and sparse suberect setae that are subequal in length to maximum width of scape; promesonotal groove present; propodeal spines present; pronotum foveolate with dorsal shiny patch; katepisternum and propodeum foveolate; about 12 short, curved, somewhat stiffened setae on mesosomal dorsum; dorsal (outer) margin of hind tibia with short decumbent setae and sparse suberect setae that are subequal in length to maximum width of tibia; dorsal surface of postpetiole faintly foveolate; first gastral tergum with fine short striations near postpetiolar insertion, smooth and shining elsewhere; gastral dorsum with moderately abundant, somewhat stiff setae; color red brown.

Major Measurements (holotype): HL 0.86, HW 0.84, SL 0.52, EL 0.12, IHT 0.28, OHT 0.35, CI 98, SI 62, HTI 79.

Mandible shiny, with coarse piligerous puncta, coarse striae at base; clypeus smooth and flat with distinct anterior notch; frontal carinae somewhat elevated and laminar; face rugose foveolate on sides of head between frontal carina and compound eye, gradually fading behind eye to smooth and shiny vertex lobes (extent of shiny area variable), medial area an irregular mixture of smooth and shiny patches, longitudinal rugulae near frontal carinae, and patches of faint foveolate sculpture; posterior margin of vertex with sparse stiff erect setae, side of head in full face view with short appressed setae only, no projecting erect setae; scape foveolate, terete at base, with appressed pubescence and sparse erect setae subequal in length to maximum width of scape; hypostomal margin gently curved; median tooth small to absent; inner hypostomal teeth minute denticles (may be drawn out into thin, needle-like spines) closer to outer hypostomal teeth than to midline; promesonotal groove present; propodeal spines present; mesosoma largely foveolate with variable extent of shiny patch dorsally; dorsal (outer) margin of hind tibia with appressed pubescence and sparse erect setae subequal in length to maximum width of tibia; 12–14 stiff erect setae on mesosomal dorsum; postpetiole in dorsal view globular, wider than long, faintly foveolate; first gastral tergum with small area of fine short striations near postpetiolar insertion, smooth and shining elsewhere; gastral dorsum with abundant, somewhat stiff setae; color red brown.

Type Material

MEXICO: 24 km south of Cintalapa, Chiapas, col. William P. MacKay. Museum of Comparative Zoology

Etymology

Named after the collector and myrmecologist William P. MacKay.

References