The ant genus Cladomyrma was described by Wheeler
(1920), with Aphomomyrmex hewitti Wheeler, 1910 as the
type species. Agosti (1991) placed this genus in the tribe
Lasiini of the subfamily Formicinae. Agosti et al. (1999)
revised the Oriental species to include 11 species in two
species groups, all of which were distributed in Sundaland
(Malay Peninsula, Borneo and Sumatra). Eguchi and Bui
(2006) described the first continental Southeast Asian species,
Cladomyrma scopulosa Eguchi and Bui, 2006 from
northern Vietnam. Currently 12 nominal species of the
genus are listed (Bolton, 2012), but Fujiwara et al. (2004) recorded
an unidentified species from eastern Thailand, while
comparing the surface chemicals of this ant and its host
plant. An ecological feature of this genus is the myrmecophytic
association with various taxa of plants, i.e., the utilization
of living pithy stems of trees and vines as nest sites
(Agosti et al. 1999; Eguchi and Bui 2006).
Recently, we obtained a rich material of the species reported
by Fujiwara et al. (2004) from eastern Thailand. After
careful study we conclude that this species is new to science.
In the present paper we describe it as a new species based on
the queen, workers (major and minor), and male.