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Species: Stenamma nanozoi   Branstetter, 2013 

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Taxonomic History (provided by Barry Bolton, 2021)

Stenamma nanozoi Branstetter, 2013 PDF: 196, figs. 128-130 (w.q.m.) HONDURAS. Neotropic. AntCat AntWiki


This species belongs to the Middle American clade of Stenamma (see Branstetter 2012). All conent on this page modified from Branstetter (2013) unless noted otherwise.

// Distribution


  Geographic regions (According to curated Geolocale/Taxon lists):
    Americas: Honduras
  Biogeographic regions (According to curated Bioregion/Taxon lists):

Distribution Notes:



Stenamma nanozoi is mainly an inhabitant of lowland wet forest, with most specimens collected between 0–600 m elevation. However, a few specimens have been collected from montane Liquidambar forest at Celaque in Honduras between 1500–1600 m. All collections, except for one cookie bait sample, were made from sifted leaf litter taken from the forest floor.


Worker diagnosis. Integument mostly dark red-brown to brown; small-sized species (see HL, ML, PrW below); basal margin of mandible sinuous, with a small basal notch and accompanying tooth; anterior clypeal margin viewed at anterodorsal angle forming 4 blunt teeth (only outer teeth visible in full-face view); pilosity on gastral tergites mostly forming a moderately sparse layer of thickened suberect setae, with only a few thin decumbent setae present; face mostly rugoreticulate; mesosoma mostly rugulose and punctate, without large areas of smooth cuticle; eye of small to moderate size (EL 0.08–0.10, REL 15–18), oval-shaped, with 4–5 ommatidia at greatest diameter; propodeal spines tuberculate (PSL 0.07–0.09, PSI 1.2–1.4); frontal lobes somewhat expanded (FLD 0.14–0.16, FLI 28–31), but not completely obscuring torular lobes in full-face view.

Similar species: Stenamma nonotch, S. saenzae, S. sandinista, S. schmidti.

     Worker description. (10 measured) HL 0.56–0.63 (0.61), HW 0.49–0.56 (0.54), FLD 0.14–0.16 (0.16), PCW 0.03 (0.03), SL 0.48–0.53 (0.51), EL 0.08–0.10 (0.10), ACL 0.48–0.53 (0.53), ML 0.68–0.76 (0.74), PrW 0.35–0.40 (0.38), PSL 0.07–0.09 (0.09), SDL 0.05–0.07 (0.07), PL 0.25–0.28 (0.27), PH 0.14–0.17 (0.15), PW 0.11– 0.14 (0.13), PPL 0.13–0.16 (0.15), PPH 0.12–0.15 (0.14), PPW 0.14–0.16 (0.15), MFL 0.48–0.55 (0.55), MTL 0.39–0.44 (0.43), CI 87–92 (89), SI 90–99 (95), REL 15–18 (18), FLI 28–31 (30), PSI 1.2–1.4 (1.3), MFI 97–104 (98), ACI1 65–69 (66), ACI2 96–103 (103). 
     Small-sized species; general body color dark red-brown to brown, with appendages lighter, brown to yellow-brown toward extremities; setae golden brown; mandible with 6 teeth, basal tooth often well-defined, projecting; basal margin of mandible sinuous, with a distinct basal notch and accompanying small tooth; mandible mostly smooth, except for scattered piligerous punctae, and some striae around the basal and along lateral surface; anterior clypeal margin in anterodorsal view undulating, forming 4 blunt teeth (only outer teeth visible in full-face view); median lobe of clypeus with a pair of somewhat distinct longitudinal carinulae, that diverge toward anterior margin, apex of lobe with a short transverse carinula, remainder of clypeus mostly smooth; posterior extension of clypeus between antennal insertions somewhat narrow (FLD 0.14–0.16, FLI 28–31), with sides diverging slightly posteriad; frontal lobes somewhat expanded (FLD 0.14–0.16, FLI 28–31), but not completely obscuring torular lobes in full-face view; head roughly oval-shaped (CI 87–92), with posterior margin distinctly depressed medially; eye of small to moderate size (EL 0.08–0.10, REL 15–18), oval-shaped, with 4–5 ommatidia at greatest diameter; face mostly strongly rugoreticulate, with a few longitudinal carinulae along midline near frontal lobes; scape of moderate length (SI 90–99), not quite reaching posterior margin when laid back; scape surface mostly smooth, with faint striations and piligerous punctae; flagellum with a distinct 4-segmented antennal club; dorsum of pronotum with irregular longitudinal rugulae that sometimes merge, dorsum of metanotum more rugoreticulate-punctate, side of pronotum mostly carinulate, with a small patch of smooth cuticle near ventral margin, mesopleuron and side of propodeum rugulose-punctate, propodeal dorsum and upper half of declivity with transverse carinulae; promesonotum in profile low-domed, roughly symmetrical, but anterior face distinctly longer than posterior face; metanotal groove of moderate depth and width, sometimes with a small central welt (metanotum); propodeal spines tuberculate (PSL 0.07–0.09, PSI 1.2–1.4); petiole in profile of moderate length (PL/HW 0.48–0.54), peduncle somewhat slender, narrowing toward body; petiolar node of moderate height (PH/PL 0.52-0.61), asymmetrical, with anterior face slightly longer and more sloping than posterior face, dorsum of node narrowly rounded, almost becoming a well-defined apex, node always pointing distinctly posteriad; postpetiole in profile subspherical to oblong, appearing somewhat compressed anteroposteriorly, roughly symmetrical, and similar in size to slightly smaller than petiolar node (PPH/PH 0.83–0.99); anterior faces of petiolar and postpetiolar nodes mostly smooth, remaining surfaces mostly punctate, with some rugulae on posterior half of postpetiole; gaster mostly smooth and shiny, with scattered piligerous punctae; face pilosity short, bilayered; dorsum of mesosoma and gaster mostly with a sparse layer of thickened, suberect setae, gaster with a few thin decumbent setae; setae on scapes and legs mostly appressed, with some suberect setae on femoral venters and coxae.
     Queen description. (5 measured) HL 0.57–0.63 (0.62), HW 0.51–0.58 (0.57), FLD 0.16–0.18 (0.17), PCW 0.03–0.04 (0.04), SL 0.48–0.52 (0.52), EL 0.14–0.16 (0.16), ACL 0.48–0.52 (0.51), ML 0.75–0.85 (0.85), PrW 0.43–0.49 (0.49), PSL 0.09–0.11 (0.11), SDL 0.07–0.09 (0.08), PL 0.27–0.32 (0.31), PH 0.16–0.17 (0.17), PW 0.12–0.15 (0.15), PPL 0.14–0.15 (0.15), PPH 0.14–0.17 (0.17), PPW 0.15– 0.18 (0.18), MFL 0.50–0.56 (0.56), MTL 0.40–0.45 (0.45), CI 90–92 (92), SI 90–97 (91), REL 26–28 (28), FLI 31–32 (31), PSI 1.2–1.4 (1.4), MFI 99–104 (102), ACI1 65, ACI2 99–101 (100).
     Same as worker except for standard queen modifications and as follows: pronotum transversely carinulate, with dorsum of cervical shield punctate; mesoscutum longitudinally rugulose, with some irregular reticulations; scutellum longitudinally rugulose to rugoreticulate, usually with a small patch of smooth cuticle mesad; propodeum with transverse carinulae that wrap around surface; mesopleuron mostly smooth; pilosity on gaster distinctly bilayered, with a stout layer of long suberect to subdecumbent setae, and a very dense layer of decumbent to appressed pubescence; wing venation as in specimen CASENT0622005
     Male. See specimen CASENT0622004.


This species can be separated from similar forms by its mandible structure, eye size, gastral pilosity, facial sculpture, and overall size. Geography is also useful, as S. nanozoi is known from only a few sites in Honduras, mostly at low elevation.

Given the complexity of the S. schmidti complex (see comments under S. schmidti), it could be that S. nanozoi represents an allopatric variant of S. schmidti. Branstetter (2013) separated it out as a distinct species because it occurs at several sites in Honduras and maintains its distinctive features, and molecular data show it to be sister to S. sandinista and outside of the clade that includes most S. schmidti-complex forms. However, within the S. schmidti complex, there are several low-elevation variants that have some of the same characteristics as S. nanozoi, mainly small size and thickened gastral setae. Thus, the species status of S. nanozoi should be considered somewhat tentative.

Taxonomic Notes:

Type material. Holotype worker. HONDURAS, 12km SW La Ceiba La Ceiba, 15.69175°N, 86.86977°W ±20m, 200m, 19 Jun 2010, tropical rainforest, ex sifted leaf litter (LLAMA, collection Wa-C-09-2-07) [USNM, specimen CASENT0621828]. Paratypes: same data as holotype [1dq, 1w, USNM, CASENT0621826, CASENT0621827]; same data but 15.69449°N, 86.86339°W ±20m, 200m, 19 Jun 2010 (LLAMA, Wa-C-09-2-25) [1dq, 1w, CAS, CASENT0623384, CASENT0623388], [1dq, 1w, EAPZ, CASENT0623385, CASENT0623389], [1w, ECOSCE, CASENT0623390], [1w, FMNH, CASENT0623391], [1w, ICN, CASENT0623392], [1dq, 1w INBio, CASENT0623386, CASENT0623393], [1w, JTLC, CASENT0623394], [1w, LACM, CASENT0623395], [1dq, 2w, MGBPC, CASENT0623387, CASENT0623396, CASENT0623397]; 15.69449°N, 86.86311°W ±20m, 200M, 19 Jun 2010 (LLA- MA, Wa-C-09-1-31) [1dq, 1w, MCZ, CASENT0623400, CASENT0623402], [1w, MZSP, CASENT0623403], [1dq, 1w, UCD, CASENT0623401, CASENT0623404], [1w, UNAM, CASENT0623405], [1w, UVGC, CASENT0623406].


Branstetter, M. G. 2012. Origin and diversification of the cryptic ant genus Stenamma Westwood (Hymenoptera: Formicidae), inferred from multilocus molecular data, biogeography and natural history. Systematic Entomology 37:478-496. 10.1111/j.1365-3113.2012.00624.x.

Branstetter, M. G. 2013. Revision of the Middle American clade of the ant genus Stenamma Westwood (Hymenoptera, Formicidae, Myrmicinae). ZooKeys 295:1-277. doi: 10.3897/zookeys.295.4905.

Specimen Habitat Summary

Found most commonly in these habitats: 95 times found in tropical rainforest, 5 times found in tropical wet forest, 1 times found in ridgetop cloud forest, 1 times found in riparian Liquidambar-Pinus forest, 1 times found in 2º lowland rainforest with cacao.

Found most commonly in these microhabitats: 102 times ex sifted leaf litter, 1 times at bait.

Collected most commonly using these methods: 80 times MiniWinkler, 22 times maxiWinkler, 1 times Baiting.

Elevations: collected from 60 - 1530 meters, 239 meters average

Collect Date Range: collected between 2008-09-30 and 2010-06-19

Type specimens: Holtype Stenamma nanozoi: casent0621828; Paratype Stenamma nanozoi: casent0621826, casent0621827

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