Pheidole plagiaria

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Pheidole plagiaria
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Pheidole
Species: P. plagiaria
Binomial name
Pheidole plagiaria
Smith, F., 1860

Pheidole plagiaria casent0281714 p 1 high.jpg

Pheidole plagiaria casent0281714 d 1 high.jpg

Specimen Labels

Subspecies
Synonyms

Indo-Malayan populations inhabit well-developed forests, and usually nest in rotting logs and wood fragments. On the other hand, Indo-Chinese populations often occur in forest edges and even in open lands adjacent to forests, and usually nest in the soil (Eguchi 2001).

Identification

This species is characterized among Indo-Chinese species by the combination of the following features: in the major posterior margin of head in full-face view relatively widely and deeply concave; in the major the posteriormost part of the dorsum of vertexal lobe almost transversely rugose; in the major and minor the posterior slope of promosonotal dome with a prominence or mound; in the major outer surface of foretibia bearing relatively long decumbent-suberect hairs; in the minor median part of clypeus with a zigzag or ramified (but rarely straight) median carina which is usually accompanied with weak rugulae. The minor of this species is similar to that of Pheidole binghamii, but in the latter median part of clypeus has no rugula and the mound on the posterior slope of promesonotal dome has only a pair of hairs. (Eguchi 2008)

Keys including this Species

Distribution

Widely distributed in the Indo-Chinese, Indo-Malayan subregions and Austro-Malayan subregion.

Distribution based on Regional Taxon Lists

Indo-Australian Region: Borneo, Indonesia (type locality), Krakatau Islands, Malaysia, Philippines.
Oriental Region: Laos, Myanmar, Thailand, Vietnam.
Palaearctic Region: China.

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.

  • plagiaria. Pheidole plagiaria Smith, F. 1860b: 112 (s.w.) INDONESIA (Batjan I.). Senior synonym of divergens: Mayr, 1879: 675 (in key); of yomensis: Eguchi, 2008: 73. Current subspecies: nominal plus moica, palawanica, rectilineata. See also: Eguchi, 2001b: 88.
  • divergens. Pheidole divergens Mayr, 1867a: 97 (s.w.q.m.) INDONESIA. Junior synonym of plagiaria: Mayr, 1879: 675 (in key).
  • yomensis. Pheidole peguensis r. yomensis Forel, 1903c: 253 (s.) MYANMAR. Junior synonym of plagiaria: Eguchi, 2008: 73.

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

Description

Worker

Eguchi 2001. Figure 34.

Eguchi (2008) - Major (n=5). — HL 1.65–1.89 mm, HW 1.59–1.77 mm, CI 91–98, SL 1.03–1.22 mm, SI 59–71, FL 1.42–1.70 mm, FI 85–99. Minor (n=5). — HL 0.79–0.93 mm, HW 0.67–0.75 mm, CI 81–85, SL 1.01–1.20 mm, SI 146–163, FL 1.12–1.36 mm, FI 162–181.

Major. — Head in lateral view not or only very weakly impressed on vertex; posterior margin of head in full-face view relatively widely and deeply concave; longitudinal rugulae running on the frons and then spreading posterolaterad as they run almost transversely on the posteriormost part of the dorsum of vertexal lobe; posterolateral face of head with oblique rugulae which run anteroventrad from dorsal face of vertexal lobe; frontal carina conspicuous; antennal scrobe inconspicuous or only weakly impressed; median longitudinal carina of clypeus present but weak, or rarely absent; median and submedian processes of hypostoma inconspicuous or absent; lateral processes conspicuous; outer surface of mandible covered with relatively long decumbent hairs; antenna with a 3-segmented club; maximal diameter of eye a little longer, as long as, or a little shorter than antennal segment X. Promesonotal dome in dorsal view transversely rugose with interspaces smooth to shagreened, or smooth to shagreened with sparse several transverse rugulae; the dome in lateral view with a low prominence or mound on its posterior slope; humerus of the dome not or hardly produced laterad; the dome at the humeri narrower than at the bottom; mesopleuron, metapleuron and lateral face of propodeum rugoso-reticulate, with enclosures punctured. Outer surface of foretibia bearing relatively long decumbent-suberect hairs. Petiole longer than postpetiole (excluding helcium); postpetiole not massive. First gastral tergite largely smooth and shining, but sometimes weakly punctured around its articulation with postpetiole.

Minor. — Frons and dorsal face of vertex smooth and shining, or very weakly punctured or rugoso-punctate; area between antennal insertion and eye rugose or rugoso-punctate; preoccipital carina well-developed; median part of clypeus with a zigzag or ramified (but rarely straight) median carina which is usually accompanied with weak rugulae; antenna with a 3-segmented club; scape extending far beyond posterolateral margin of head; maximal diameter of eye shorter than antennal segment X. Promesonotal dome smooth and shining, or in dorsal view concentrically rugose, with a median area smooth and shining or very weakly punctured; the posterior slope of the dome with a low mound which bears several (>2) standing hairs; humerus in dorso-oblique view not or hardly produced; mesopleuron, metapleuron and lateral face of propodeum punctured, usually overlain by weak rugoso-reticulation; propodeal spine horn-like or elongate-triangular, narrowly based, directing relatively upward. Petiole longer than postpetiole (excluding helcium); postpetiole not massive.

Type Material

The following notes on F. Smith type specimens have been provided by Barry Bolton (details): Three major worker and three minor worker syntypes in Oxford University Museum of Natural History. Arranged on three cards as follows:

  • Card 1. 1 major and 1 minor, labelled “Bac.” With Smith’s original label plus Donisthorpe det. labels.
  • Card 2. 2 majors, labelled “Bac. 26.” With Smith det. label “plagiaria.”
  • Card 3. 2 minors, labelled “Bac. 35.” With Smith det. label “plagiaria.”

Eguchi (2008):

Syntypes: 3 majors & 3 minors, “Bac” [Batjan, Indonesia], Oxford University Museum of Natural History TYPE HYM: 983 1-2/6, 3-4/6 & 5-6/6, examined.

Pheidole divergens. Syntypes: major, minor, queen & male, Indonesia, not examined.

Pheidole peguensis r. yomensis. Syntype: 1 major, “Lower Burma Pegu Yoma 1 1900 Bingham” [Myanmer], Musee d'Histoire Naturelle Genève, examined, designated as lectotype.

Current subspecies (Bolton, 1995): nominal plus moica Forel, 1911c: 222, syntype(s): major, Central part of Southern Vietnam, not examined; palawanica Stitz, 1925: 118, syntypes: 2 majors, “N. Palawan Binaluan Boettcher” [Philippines], Berlin Museum für Naturkunde der Humboldt-Universität, examined; rectilineata Viehmeyer, 1916b: 288–289, syntype(s): major, Sulawesi (in copal), not examined.

References

  • Eguchi, K. 2001a. A revision of the Bornean species of the ant genus Pheidole (Insecta: Hymenoptera: Formicidae: Myrmicinae). Tropics Monograph Series. 2:1-154. PDF (page 88, see also)
  • Eguchi, K. 2003. A Study on the Male Genitalia of Some Asian Species of Pheidole (Hymenoptera, Formicidae, Myrmicinae). Sociobiology 41(2): 317-355 (page 332, figs. 19A, B male genitalia described)
  • Eguchi, K. 2008. A revision of Northern Vietnamese species of the ant genus Pheidole (Insecta: Hymenoptera: Formicidae: Myrmicinae). Zootaxa. 1902:1-118. PDF
  • Mayr, G. 1879. Beiträge zur Ameisen-Fauna Asiens. Verh. K-K. Zool.-Bot. Ges. Wien 28: 645-686 (page 675, senior synonym of divergens (in key))
  • Smith, F. 1860b. Catalogue of hymenopterous insects collected by Mr. A. R. Wallace in the islands of Bachian, Kaisaa, Amboyna, Gilolo, and at Dory in New Guinea. J. Proc. Linn. Soc. Lond. Zool. 5(17b)(suppl. to vol. 4 4: 93-143 (page 112, soldier, worker described)