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Genus: Amyrmex   Kusnezov, 1953 


Note: Not a Valid Taxon Name

Current Valid Name:


Taxonomic History (provided by Barry Bolton, 2019)


  Geographic regions: Not found on any curated Geolocale/Taxon lists.
  Native biogeographic regions (according to species list records):

Taxonomic Treatment (provided by Plazi)

Treatment Citation: Ward, P. S. & Brady, S. G., 2009, Rediscovery of the ant genus Amyrmex Kusnezov (Hymenoptera: Formicidae) and its transfer from Dolichoderinae to Leptanilloidinae., Zootaxa 2063, pp. 46-54

Redescription of male of AmyrmexHNS Kusnezov

Head broader than long (CI 1.25-1.37), with large convex eyes that occupy the anterior two-fifths to one half of the sides of head (REL 0.43-0.57) (Figure 2); mandibles slender, elongate-triangular to sublinear, masticatory margin edentate and weakly differentiated from the unarmed basal margin; external margin of mandible curved basally, straight medially, and bent slightly mesad at apex (Figures 2, 4-5); mandible tips crossing at closure, mandible length subequal to eye length (ML/EL 0.88-1.10, ML/HW 0.35-0.41); genal teeth and hypostomal teeth lacking; clypeus short and transverse, bordered anteriorly by a thin clypeal lamella (apron); antennal sockets horizontal and exposed, and located close to the anterior clypeal margin; antenna 13-segmented, each segment longer than wide; scape of moderate length, SI 0.27-0.31; scape length subequal to or less than the length of ultimate antennal segment (SL/LA13 0.73-0.97), scape length 0.11-0.14* total length of antenna, less than twice the length of the second antennal segment (SL/LA2 1.50-1.78), and slightly more than half the combined length of the second, third and fourth antennal segments (SL/(LA2+LA3+LA4) 0.52-0.65); lateral ocelli separated from median ocellus by about their diameters.

Mesosoma with distinctive pronotum (Figure 3): U-shaped in dorsal view and reduced anteromedially to a thin horizontal strip, set well below the level of the dorsally protruding mesonotum; pronotum triangular in profile, with pointed posterior apex directed towards the wing base; mesonotum lacking notauli; parapsidal sutures very weakly impressed, barely discernable; axillae not meeting medially, connected by a narrow furrow; tegula very small and inconspicuous; mesopleuron lacking oblique transverse sulcus and hence not divided into anepisternum and katepisternum; mesoscutellum prominently bulging, as seen in lateral view; metapleural gland reduced and inconspicuous; propodeal spiracle small, circular, positioned at about midheight of propodeum and slightly posterior to the metanotum. Legs slender (LHT/HL ~1.2); mesotibia and metatibia each with a single short spur; tarsal claws lacking preapical tooth.

Wings with reduced venation (Figure 6); pterostigma present; forewing with elongate submarginal cell, four times longer than wide, and longer than basal cell; base of Rs weak, and absent in one species (Amyrmex BR02), resulting in confluence of the basal and submarginal cells; submarginal cell extending distad of stigma and terminating in an acute point; no free M vein after Rs+M; discal (medial) cell lacking, i.e., m-cu crossvein absent; A merging into cu-a, which curves anteriorly to join M+Cu at the point where veins M and Cu diverge, hence no free A vein distal to cu-a (Figure 6); hindwing lacking closed cells; anterior margin of hindwing with 1-4 hamuli; jugal lobe absent.

Metasoma slender in profile, obovate in dorsal view, widest at abdominal segment 5; abdominal segment 2 (petiole) subquadrate in profile (Figure 3), longer than high or wide, and only weakly constricted posteriorly, the helcium thus apparently quite broad; spiracle on abdominal segment 2 located on anterior third, near anterodorsal extremity; abdominal segment 3 larger than petiole, and not developed as postpetiole nor separated from abdominal segment 4 by a marked constriction; abdominal spiracle 3 located on anterior third of tergite; abdominal segments 2 and 3 with tergosternal fusion; abdominal segment 4 lacking tergosternal fusion; segment 4 with short but distinctly differentiated presclerites; spiracle present on anterior half of tergite 4; abdominal segments 5 and 6 lacking well differentiated presclerites, and not separated from succeeding segments by constrictions; abdominal spiracles 5 and 6 not discernable in specimens examined but possibly present at anterior margins of respective tergites; abdominal tergite 8 (pygidium) small and simple but visible dorsally, not wholly covered by abdominal tergite 7; cerci absent; subgenital plate (abdominal sternite 9) with posterior margin broadly concave but not bifurcate; basal ring not hypertrophied; paramere small and slender with rounded apex, paramere about 0.8* petiole length; volsella a simple, elongate-triangular lobe, lacking differentiated cuspis.

Body size very small; total length, excluding appendages, approximately 1.1-1.7 mm; HW 0.32-0.41, LHT 0.29-0.39; integument mostly smooth and shiny, with scattered piligerous punctures; pilosity common on most of body, suberect to decumbent. Color: body yellowish-brown to medium-brown, head and posterior margins of abdominal segments 4-7 darker, appendages (antennae, mandibles, legs) lighter.

FIGURES 2-5. Automontage images of Amyrmex males. 2. Amyrmex BR01 (CASENT0106184), dorsal (full-face) view of head; 3. Amyrmex BR01 (CASENT0106184), lateral view of body; 4. Amyrmex BR01 (CASENT0106184), close-up of right mandible; 5. Amyrmex golbachiHNS (CASENT0106195), close-up of right mandible.

FIGURE 6. Right forewing, male Amyrmex BR01 (CASENT0106185). The above description is a composite, based on the following material:

Amyrmex golbachiHNS, 1 male, ARGENTINA Formosa: Estancia Guaycolec, 25km N Formosa, 185m, 25°59'S 58° 12W, 17-20.xii.1998, Malaise trap, S. L. Heydon (UCDC) (CASENT0106195).

Amyrmex BR01, 4 males, BRAZIL Rondonia: Fazenda Rancho Grande, 62km S Ariquemes, 165m, 12-22 November 1991, 10°18' S, 62°53'W, E. M. Fisher (CASC, MZSP, UCDC) (CASENT0106161, CASENT0106183, CASENT0106184, CASENT0106185).

Amyrmex BR02, 1 male, BRAZIL Rondonia: Fazenda Rancho Grande, 62km S Ariquemes, 165m, 12-22 November 1991, 10°18' S, 62°53'W, E. M. Fisher (UCDC) (CASENT0106186).

The male of Amyrmex golbachiHNS from Argentina (Formosa) matches the original description (Kusnezov 1953) and the images of A. golbachiHNS males from Tucuman on AntWeb ( Differences between the three taxa are summarized in Table 1.

TABLE 1. Differences among males of three species of Amyrmex. Contrasts in mandible shape are depicted in Figures 4-5. "B" and "SM" refer to the basal cell and submarginal cell, respectively.

Amyrmex golbachiHNS

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