Odontomachus philippinus Emery, 1893

Sorger, D. M. & Zettel, H., 2011, On the ants (Hymenoptera: Formicidae) of the Philippine Islands: V. The genus Odontomachus Latreille, 1804., Myrmecological News 14, pp. 141-163 : 153-154

Odontomachus philippinus Emery, 1893 stat.n. (Figs. 6, 12, 18, 33, 34, 46)

Odontomachus papuanus st. philippinus Emery, 1893: 203 (description of worker; type locality: " Manila " ).

Odontomachus papuanus ssp. philippinus: Wheeler & Chapman 1925: 71 (partim; distribution); Chapman & Capco 1951: 45 (catalogue); Baltazar 1966: 239 (distribution: Luzon, Manila; Negros Oriental, Romblon); Brown 1976: 104, 126-127 (new synonym of O. infandus, morphology, discussion).

Odontomachus infandus (misidentification; nec Smith, 1858): Forel 1910: 122 (distribution: Negros); Wheeler & Chapman 1925: 71 (distribution: Negros). Type material examined: Holotype (worker; MCSNG, Fig. 33) from "Manilla, Mayr" (labels see Fig. 34).

Notes on the type locality: Emery (1893) describes Odontomachus philippinus as a race of O. papuanus , a species from New Guinea. He writes "provenient de Manille et m'a été envoyée par M. Mayr" [translated: origins from Manila and sent to me by Mr. Mayr]. A single worker in the Museum Genoa is the holotype. There are two further workers in the Natural History Museum Vienna which origin from Mayr's Collection and bear a label with Mayr's notes " papuanus var. m. gestreiften Seitengruben det. G. Mayr" [translated: papuanus variation with striped side grooves]" [on head]. These specimens bear locality labels "Manilla Heer." and "Manilla Forel.", respectively. Both Heer and Forel were collectors, but like Mayr they never reached Asia. We assume that all three specimens are from the same series, but that their provenience from the city of Manila is doubtful or - more unlikely - after human transportation. According to newly collected material, which agrees very well with the holotype, O. philippinus occurs only in the Western Visayas. Its native occurrence in Central Luzon, the best sampled area in the Philippines, is very unlikely.

Additional material examined (44 workers, BMNH, CSW, CZW, NHMW, USC): Negros: Negro s Orien- t a l: Canlaon City, Mananawin, Mandalagon Falls, 26.I. 2007, leg. H. Zettel (455), 8 ∑∑. Dumaguete, leg. J.W. Chapman, 2 ∑∑. Dumaguete, Camp, leg. J.W. Chapman, 1 ∑. Cuernos de Negros, Valencia, Apolong, Casaroro Falls, 9.-13.III.2005, leg. H. Zettel (420), 2 ∑∑, 26.III.2006, leg. H. Zettel & C. V. Pangantihon (451), 8 ∑∑, 28.1.2007, leg. H. Zettel (456), 10 ∑∑. Panay: C a p i z: Dumalag, Suhut, 15.V.2005, leg. C. V. Pangantihon (P169), 12 ∑∑. Siquijor: Bandila-an National Park, between lodge and "Little Waterfall", 23.X.2004, leg. C. V. Pangantihon (P395), 3 ∑∑.

Description of worker: Measurements: worker with smallest HW: CI 68, HL 3.03, HW 2.07, MdI 62, MdL 1.88, MsL 4.70, SI 152, SL 3.13, PnW 1.22, PtH 1.22, PtL 1.36, PtW 0.44, TL 13.19; worker with largest HW: CI 72, HL 3.63, HW 2.60, MdI 57, MdL 2.07, MsL 4.80, PnW 1.57, PtH 1.54, PtL 1.68, PtW 0.54, SI 138, SL 3.60, TL 15.63.

Structures: Striation on head extending from frontal lobes to ocular ridge, rest of head smooth and eshiny. Pronotum with relatively coarse transversely oriented striation, in dorsal view no loops visible (loops may be visible in lateral view); posterolateral parts without striation, smooth and shiny. Mesopleuron smooth and shiny, along mesometapleural suture a few faint striae may occur dorsally or ventrally, but at its middle always smooth and shiny. Petiole S-shaped, strongly bent backwards, convex dorsally. Entire ant appearing very shiny / glossy.

Pilosity: Pubescence sparse, short.

Colour: Uniformly dark; slightly reddish brown in specimens from Siquijor.

Distribution (Fig. 46): Endemic to the Philippines and there restricted to the western Visayas islands of Panay, Negros and Siquijor. Natural occurrence in Central Luzon (Manila) (Emery 1893) is doubtful.

Habitats: Odontomachus philippinus was found only in shaded, humid places in degraded primary forests or in secondary forests. This species is greatly endangered by the destruction of forests in the western Visayas region.

Notes: Odontomachus philippinus is closely related to O. scifictus sp.n.; it differs in mesopleuron sculpture and petiolar shape. See key and notes of O. scifictus sp.n.