Propodilobus pingorum

Collected as part of a soil core in mixed dipterocarp forest, in Berlese Funnel extractions of leaf mold and from winkler sampling of leaf litter. Little else is known about this species or genus. It is only known from the worker caste.

Identification
Branstetter (2009) - Propodilobus can be distinguished from Stenamma by the reduced palp formula (3,2 versus 4,3), smoothly convex anterior clypeal margin, distinct 3-segmented antennal club (ACI 74-75 versus 60-70), and elongate propodeal lobes. In addition, the postpetiole is broader than long and the scape and funiculus of Propodilobus have a more robust appearance than in Stenamma.

Propodilobus may be confused with Lordomyrma since Lordomyrma is morphologically diverse and currently lacks an adequate diagnosis. It is possible that when a more comprehensive morphological review of Lordomyrma is undertaken or the phylogenetic position of Propodilobus is tested with molecular data, Propodilobus will be synonymized under Lordomyrma or a related genus. Despite this, from the diagnoses listed in Sarnat (2006) and Taylor (2009), Propodilobus can be distinguished from Lordomyrma by its lack of longitudinal carinae on the clypeus, lack of scrobes and frontal carinae, the presence of an elongate petiolar peduncle, and the presence of elongate propodeal lobes.

Distribution
Borneo (Sarawak, Malaysia)

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

Castes
Known only from the worker caste.

Nomenclature

 * orientale. Stenamma orientale DuBois, 1998b: 308, figs. 41-43, 210-212 (w.) MALAYSIA (Sarawak). [Junior primary homonym of orientalis Emery, 1898c: 143.] Replacement name: pingorum DuBois, 2000: 40.
 *  pingorum. Stenamma pingorum DuBois, 2000: 40. Replacement name for orientale DuBois, 1998b: 308. [Junior primary homonym of orientalis Emery, 1898c: 143.] Combination in Propodilobus: Branstetter, 2009: 55.

Type Material
Brandstetter (2009) - Holotype worker and paratype workers, MALAYSIA: Sarawak, First Division, Semengoh Forest Reserve, 19 km SW Kuching (1.33ºN, 110.20ºW) (2 km S 10th mile Bazaar, on Kuching-Penrissen Road), 28–31 May 1968, R.W. Taylor, RWT-68.196, leaf mould berlesate in rainforest [Holotype and paratype workers in examined.]

References based on Global Ant Biodiversity Informatics

 * Branstetter M. G. 2009. The ant genus Stenamma Westwood (Hymenoptera: Formicidae) redefined, with a description of a new genus Propodilobus. Zootaxa 2221:41-57.
 * DuBois M. B. 2000. Stenamma pingorum: replacement name for Stenamma orientale (Hymenoptera: Formicidae). Sociobiology 36: 40.
 * DuBois, M. B. "A revision of the ant genus Stenamma in the Palaeartic and Oriental regions." Sociobiology 32 (1998): 193-403.
 * Pfeiffer M., and D. Mezger. 2012. Biodiversity Assessment in Incomplete Inventories: Leaf Litter Ant Communities in Several Types of Bornean Rain Forest. PLoS ONE 7(7): e40729. doi:10.1371/journal.pone.0040907
 * 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