Cataulacus muticus

Cataulacus muticus live in hollow internodes of giant bamboo (Gigantochloa). The ants have developed two behaviors to combat occasional flooding problems. First is for workers to use their phragmotic heads to stem the flow of water through a colony's nest entrances. Second, and as of yet a unique trait for ants, is what has been termed communal peeing. Workers imbibe water within the nest, leave the nest and excrete water droplets that they deposit onto the outer stem of the bamboo. (Maschwitz and Moog 2000)

Identification
A medium-sized species, definitely of the granulatus-group and seemingly closely related to Cataulacus granulatus itself, and yet distinguished by the presence of blunt propodeal tubercles instead of spines, the node of the petiole which is distinctly longer than broad, and the relatively smooth sides of the propodeum. The head, alitrunk and pedicel are relatively coarsely sculptured.

Distribution
This taxon was described from Myanmar. It is also found in India and Malaysia.

Biology
In west Malaysia this species lives inside the internodes of two plants, Gigantochloa scortechinii and Dendrocalamus asper. They form large monogynous and polydomous colonies. Colonies can contain more than 2,000 workers and spread to the internodes of several neighboring culms. (Maschwitz and Moog 2000)

• http://www.antbase.net/english/ants-of-southeast-asia/ecology/peeing-ants.html (flood controle in the nest, with picture)

Genetics
Polymorphic microsatellites have been identified for this species. (Debout et al. 2002)

Nomenclature

 *  muticus. Cataulacus muticus Emery, 1889b: 507, pl. 10, fig. 17 (w.) MYANMAR.

Worker
Bolton (1974) - TL 5.5 - ca 6.0. Head as in granulatus but proportionately larger and with the denticles of the sides of the head behind the eyes larger and more produced. Sides of pronotum and mesonotum strongly denticulate, but the sides of the propodeum with only one or two denticles and converging posteriorly. Propodeum with a pair of obtuse and blunt tubercles (referred to in Bingham as 'slightly produced rounded projecting laminae'). Petiole distinctly longer than broad, rather slender; postpetiole longitudinally oval, truncated in front and behind. Gaster as in granulatus. Head, alitrunk and pedicel very coarsely reticulate-rugose, the pedicel remarkably rugose. Gaster finely punctate and with fine longitudinal rugulae. Pilosity 'rather long', whitish in colour.

Type Material
Bolton (1974) - Holotype worker, BURMA: Tenasserim, Thagata, Mt. Mooleyit (L. Pea) (probably in MCSN, Genoa).

Additional References

 * Debout, G., A. Dalecky, et al. (2002). "Isolation and characterization of polymorphic microsatellites in the tropical plant-ant Cataulacus mckeyi (Formicidae: Myrmicinae)." Mol. Ecol. Notes 2: 459-461.

mutualistically specialized on giant bamboo. Senckenb. Biol. 80: 165-173 PDF]]
 * [[Media:Dorow 2000.pdf|Maschwitz, U.; Dorow, W. H. O.; Schellerich-Kaaden, A. L.; Buschinger, A.; Azarae, H. I. 2000. Cataulacus muticus Emery 1889 a new case of a southeast Asian arboreal ant, non-


 * Maschwitz U & Moog J (2000) "Communal peeing: a new mode of flood control in ants." Naturwissenschaften 87 (12): 563-565.