Ants of the Guiana Shield:
Daceton armigerum Latreille, 1802
Animalia, Arthropoda, Insecta, Hymenoptera, Formicidae, Myrmicinae, Dacetini
Global: This species is known to occur in the Terra Firma and flooded forests of Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, Suriname, Trinidad, and Venezuela.
Guyana: Iwokrama (Island in Essequibo River), Rupununi Upper-Essequibo River (Kwatata), Acarai Mountains
|Bolton (2000), Azorsa & Sosa-Calvo (2008):|
|Head heart-shaped. Mandibles with|
|kinetic mode of action, each with an apical fork of two teeth that overlap at full closure, of which the ventral tooth is the largest. Inner (masticatory) margin of mandibles lacking any dentition but with a series of short, thick setae that differ from any other pilosity present on mandibles. Mandibles at full gape open 170° or more.|
|Pronotal humeri with acute tubercles.|
|Lateral pronotal spines bifurcate, the anterior tips larger than the posterior ones. Mesosoma glabrous.|
|Petiolar node with an anterior-lateral|
|pair of long spines and a pair of small but sharp tubercles, located underneath the anterior-lateral spines. First gastral tergite finely reticulate and devoid of any erect or semi-erect pilosity, sometimes with very short, appressed hairs.|
|Color of head, mesosoma, and metasoma, usually red-brown to red-|
|yellowish, sometimes dark red-brown or rarely bicolored; petiole, postpetiole, and gaster darker than rest of body.
Similar species: Daceton boltoni
Daceton armigerum is an arboreal forager, usually nesting in cavities in the branches and trunks of trees previously bored by beetles and other insects, and has a polymorphic worker caste. Besides Daceton, worker polymorphism in dacetines has only evolved in one species of Orectognathus in Australia and in a single species of Strumigenys in New Guinea (Bolton 2000).
Wilson (1962) reports that workers of this highly predaceous myrmicine ant hunt individually for a variety of live insects, including flies, grasshoppers, larvae and adults of moths and beetles, and fulgorids. In addition, some workers have been observed tending coccids (Bodkin in Crawley 1916; Brown & Wilson 1960; Wilson 1962)
The biology of this species has been studied by Wheeler & Wheeler (1954 , description of larvae), Wilson (1962, ecology and behavior), Blum & Portocarrero (1966, trail pheromone and venom), Hölldobler et al. (1990, chemical communication), Moffet & Tobin (1991, physical castes), Groenenberg (1996, mandibular mode of action), Bolton (1999, 2000, classification), and Yanoviak (personal communication, aerial gliding behavior).
[ TOP ]