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No material from the Philippines examined.
Diagnosis of worker: TL 4.1 - 4.6 mm. Clypeus dorsally with strong median carina, ventrally without central tooth. Masticatory margin of mandible with diastema. Dorsum of head and alitrunk rugoreticulate. Pronotal spines moderately long (PSL1 0.19 - 0.27), distinctly longer than propodeal spines. First gastral tergite without setae.
Previous records from the Philippines: Mindanao: Davao (Mt. McKinley) (Wang 2003).
General distribution: Malay Peninsula, Singapore, Borneo, Philippines (Wang 2003).
Found most commonly in these habitats: 1 times found in rainforest, 1 times found in secondary dipterocarp rainforest, 1 times found in secondary dipterocarp rainforest/creek edge.
Found most commonly in these microhabitats: 1 times sifted litter (leaf mold, rotten wood).
Collected most commonly using these methods: 2 times hand collection.
Elevations: collected from 340 - 545 meters, 465 meters average
Type specimens: Holotype of Pristomyrmex costatus: casent0901719