Proceratium silaceum clade

Staab, Michael, Garcia, Francisco Hita, Liu, Cong, Xu, Zheng-Hui & Economo, Evan P., 2018, Systematics of the ant genus Proceratium Roger (Hymenoptera, Formicidae, Proceratiinae) in China - with descriptions of three new species based on micro-CT enhanced next-generation-morphology, ZooKeys 770, pp. 137-192 : 137

Proceratium silaceum clade

Definition.

Workers of this clade can be distinguished by a moderately squamiform petiolar node that narrows only little from base to apex (extremely squamiform in the Fiji archipelago, Hita Garcia et al. 2015) and by an almost straight to weakly concave anterior clypeal margin (definition follows Baroni Urbani and de Andrade 2003).

Comments.

The P. silaceum clade sensu Baroni Urbani and de Andrade (2003) is, with more than 30 species, the most speciose and widespread clade within the genus. Numerous species occur in, respectively, Borneo and Australia. Species of this clade have been reported from all continents and several have reached oceanic islands. From China and east Asia only two species, P. japonicum and P. longigaster , are known.