Atopomyrmex

Identification
Bolton (1981) - Polymorphic arboreal myrmicine ants. Mandibles short and stout, the apical (masticatory) margin armed in smallest workers with 2 teeth followed by 2 denticles and an unarmed straight edge; in slightly larger workers the edge crenulate or feebly denticulate. Most medium-sized and large workers with 2 teeth + 4-5 denticles but in large workers all the teeth may be worn down and rounded. Palp formula 4, 3 in all sizes; in smallest workers the two basalmost maxillary palp segments may be partially fused. Median portion of clypeus shield-like, broad, posteriorly broadly inserted between the frontal lobes. Anterior clypeal margin indented to concave medially, the median portion separated from the lateral parts by a longitudinal carina on each side. Anterior tentorial pit represented by a deep and sharply incised hole which is roughly circular, situated immediately behind the clypeus close to the antennal insertions and more obvious in larger workers. Development of frontal carinae varying with worker size. In smallest workers short and only feebly divergent, ending in front of the level of the anterior margins of the eyes. In largest workers extending back beyond the level of the posterior margins of the eyes and strongly divergent from source to level of eyes; behind this roughly parallel. Workers between largest and smallest showing intermediate development of frontal carinae. Antennal scrobes absent in smallest workers, becoming longer and deeper with increasing size; conspicuous and capable of accommodating the scape in largest workers. Antennae 12-segmented with a 3-segmented club. With head in full-face view the eyes situated behind the midlength of the sides, and the occipital corners broadly and evenly rounded. Pronotum more or less flat to shallowly concave transversely, bluntly marginate laterally, the margination more acute in smaller workers. Promesonotal suture vestigial to absent from dorsum but at sides forming an impression separating pronotum and mesonotum. Mesonotum in profile usually broadly and bluntly bituberculate behind, then sloping almost vertically to the broad metanotal groove. In medium to large workers the mesonotum with a shallow but quite broad transverse impression at about the midlength. Propodeum in profile raised immediately behind the metanotal groove then sloping downwards to a pair of strong spines. Metapleural lobes inconspicuous, very narrow and low. Propodeal spiracle circular. Lower margin of metapleuron without a broad groove running forward from the orifice of the metapleural glands; instead the margin rounded and folded under, giving the appearance of being smoothly eroded away, the hind coxa appearing to rest upon the bulla of the metapleural gland. Ventral surface of alitrunk with a very conspicuous roughly circular deep pit between the hind coxae, a sieve-plate apparently present at the bottom of the pit. Petiole dorsally with a pair of short stout spines of variable size. Dorsal surfaces of head and body without standing hairs, such hairs present only on mouthparts and gastral sternites.

Species richness
Species richness by country based on regional taxon lists (countries with darker colours are more species-rich). View Data



Nomenclature

 *  ATOPOMYRMEX [Myrmicinae: Formicoxenini]
 * Atopomyrmex André, 1889: 226. Type-species: Atopomyrmex mocquerysi, by monotypy.