Metapone quadridentata

M. quadridentata  is known only from the original series (11 workers and a gyne ) collected from a nest in rotten fallen wood, plus a single worker collected separately at the same locality (Eguchi, 1998).

Distribution based on Regional Taxon Lists
Indo-Australian Region: Borneo, Indonesia, Malaysia.

Nomenclature

 *  quadridentata. Metapone quadridentata Eguchi, 1998: 605, figs. 1-3 (w.q.l.) BORNEO.

Worker
Taylor and Alpert (2016) - (After Eguchi, 1998): TL 4.9–8.3; HL: 1.11–1.91; HW: 0.76–1.33; CI: 68, 70. CpL: 0.43–0.68; CpI: 39, 36; MSL: 1.30–2.44; PML: 0.63–1.26; PMW: 0.55–1.07; PMI: 48, 56; PDW: 0.48–0.88; PetL: 0.33–0.63; PetW: 0.35–0.68; PetH: 0.50–0.88; PpetL: 0.33–0.64; PpetW: 0.42–0.83; GW: 0.80–1.41. The cited indices were calculated from Eguchi’s smallest and largest measurements for HL and HW (CI), HL and CpL (CpI) and MSL and PML (PMI). Cephalic proportions stated in the original description are equivalent to a CI range of 67–71, and the holotype has CI 71. Additional measurements are given with the original description. The smallest and largest of four paratype workers studied here have: HL (midline) 1.21, 1.68; HL (maximum) 1.26, 1.70; HW 0.87, 1.19; CI (based on midline HL) 72 71; PMW 0.57, 0.92. Note that Eguchi measured maximum HL so as to include the occipital lobes. Our measurements are taken from the midline of the occipital border.

General features as in original description (Eguchi, 1998), the key to Asian species and figures. Eyes relatively moderately large, multifaceted, maximum diameter around 2/3 the maximum width of an apical antennomere. Subpetiolar lamella in profile an anteriorly positioned, erect, translucent, posteroventrally bluntly-pointed hook-like structure, behind which the ventral subpetiolar edge curves quite strongly to meet the subpetiolar angle which encloses approximately 90° in lateral view. Posterior subpetiolar face approximately equilaterally triangular in oblique view, its outer margins with a fine raised, translucent, laminate carina which is higher towards the apex of the posterior face, and forms a distinctive translucent margin to the posterior subpetiolar profile in lateral view, visually doubling the outline. Subpostpetiolar process barely inflated anteroventrally, forming a slightly acute angle in profile; the anterior face small, sub-semicircular in oblique view

References based on Global Ant Biodiversity Informatics

 * Pfeiffer M.; Mezger, D.; Hosoishi, S.; Bakhtiar, E. Y.; Kohout, R. J. 2011. The Formicidae of Borneo (Insecta: Hymenoptera): a preliminary species list. Asian Myrmecology 4:9-58
 * Taylor R. W., and G. D. Alpert. 2016. The myrmicine ant genus Metapone Forel (Hymenoptera: Formicidae): a global taxonomic review with descriptions of twelve new species. Zootaxa 4105(6): 501-545.
 * Wang W. Y., A. Yamada, K. Eguchi. 2019. Discovery of a new ant species of the elusive termitophilous genus Metapone in Singapore (Hymenoptera, Formicidae, Myrmicinae), with the first detailed description of male genitalia of the genus. ZooKeys 876: 125–141.