Colobopsis

Mayr, 1861

Gate-keeper Ants

Species Guides

7

Colobopsis is a of ants in the Formicinae, first described by Mayr in 1861 and containing approximately 95 . The genus is distinguished by pronounced dimorphism, with major workers possessing phragmotic (, plug-shaped) used to block nest entrances. Members of the Colobopsis cylindrica group exhibit autothysis, a defensive where minor workers rupture their to release sticky, irritant mandibular gland secretions. The genus nests primarily in plant material including wood, galls, and dead branches. Colobopsis was historically treated as a subgenus of Camponotus but was restored to full generic status following a 2015 phylogenomic study that identified it as sister to all remaining Camponotini.

Colobopsis etiolata by (c) Raven Dandridge, some rights reserved (CC BY), uploaded by Raven Dandridge. Used under a CC-BY license.Colobopsis etiolata by (c) April Nobile, some rights reserved (CC BY). Used under a CC-BY license.Colobopsis etiolata by (c) April Nobile, some rights reserved (CC BY). Used under a CC-BY license.

Pronunciation

How to pronounce Colobopsis: //ˌkɒl.oʊˈbɒp.sɪs//

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Identification

possess 5-8 mandibular teeth with the 3rd tooth from the apex not reduced; 12-segmented with antennal insertions well separated from the clypeal margin. Major workers and queens have phragmotic that are to varying degrees, distinguishing them from typical Camponotus. Pupae are naked, lacking cocoons (unlike Camponotus pupae, which are enclosed in cocoons). Workers in the C. cylindrica group have greatly enlarged mandibular glands extending from the head to the .

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Habitat

Nests constructed in plant material including wood, galls, and dead branches. Nests in trees ranging from forest floor and understory to and emergent layers in tropical rainforest systems.

Distribution

Widespread distribution including Southeast Asia (Borneo, Thailand, Malaysia), Mediterranean region, Europe, and East Asia (China, Japan).

Life Cycle

Colony founding may occur in pre-existing cavities; queens of some show mandibular less optimized for excavation compared to , suggesting reduced digging requirements when colonizing empty galls. Pupae develop without cocoons (naked pupae). Mating have been observed, with males documented for several species.

Behavior

Major and queens employ : using to physically plug nest entrances against intruders, moving back into widened tunnel sections to allow nestmate passage. Entrance-guarding occurs continuously with multiple major workers maintaining defense without fixed shift patterns. Minor workers in the C. cylindrica group exhibit autothysis (self-sacrifice by rupture) during territorial combat, releasing sticky, toxic mandibular gland secretions to kill or repel enemies; this is fatal to the worker. Activity patterns vary with time of day and temperature.

Ecological Role

Some engage in mimicry relationships, adapting appearance to match local model species.

Human Relevance

Colobopsis explodens serves as a model for studies on autothysis and social insect defense strategies.

Similar Taxa

  • CamponotusHistorically confused with Colobopsis; distinguished by cocoon-enclosed pupae, and most Camponotus lack the pronounced phragmotic specialization seen in Colobopsis major . Some Camponotus do exhibit phragmotic heads, requiring careful examination of pupal characteristics and mandibular for definitive separation.

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