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Costa Rica (Atlantic lowlands to 800m).
Inhabits leaf litter in mature wet forest.
types Mus. Comp. Zool. Harvard.
Diagnosis Similar in various traits to the species listed in the heading, differing as follows.
Major: blackish brown; very small; head elongate; frontal triangle not demarcated; eyes placed well forward on head; humerus low and lobate; propodeal spines equilaterally triangular; postpetiole from above elliptical; dorsal surface of head, including occiput but not midclypeus, foveolate; mesosoma almost entirely smooth and shiny.
Minor: carinulae limited to antennal fossae; all of head and mesosoma smooth and shiny; propodeal spines moderately long, and thin;
occiput broad, its margin weakly concave, and lacking nuchal collar.
measurements (mm) Holotype major: HW 0.56, HL 0.70, SL 0.26, EL 0.10, PW 0.34.
Paratype minor: HW 0.34, HL 0.40, SL 0.30, EL 0.06, PW 0.24.
color Major: concolorous blackish brown, appendages medium brown.
Minor: sides of mesosoma medium to dark reddish brown; rest of body, and appendages, dark, almost blackish brown.
Range Atlantic lowlands to 800 m in Costa Rica (Longino 1997).
biology This tiny species inhabits mature rainforest where it nests in rotten hollow twigs in leaf litter on the forest floor.
Figure Upper: holotype, major. Lower: paratype, minor. COSTA RICA: La Selva Biological Station, near Puerto Viejo, Heredia (Stefan Cover). Scale bars = 1 mm.
Found most commonly in these habitats: 315 times found in mature wet forest, 64 times found in tropical rainforest, 45 times found in tropical wet forest, 50 times found in lowland rainforest, 36 times found in 2º lowland rainforest, 22 times found in montane wet forest, 11 times found in wet forest, 3 times found in LOC, 1 times found in CES, 1 times found in SSO, ...
Found most commonly in these microhabitats: 403 times ex sifted leaf litter, 59 times at bait, 21 times Hojarasca, 47 times sifted litter, 4 times pecan sandie bait, 2 times Primary forest, 1 times litter/soil core, 1 times forest leaf litter, 1 times Cerca de; Cañon del rio Peje hacia Cascante, 1 times Bosque Primario, Suelo, 2 times beating vegetation, ...
Collected most commonly using these methods: 368 times miniWinkler, 73 times Winkler, 69 times baiting, 24 times Berlese, 26 times MaxiWinkler, 11 times Pitfall, 9 times Mini Winkler, 3 times flight intercept trap, 3 times Lure/Bait, 2 times Beating, 1 times Unknown, ...
Elevations: collected from 5 - 1090 meters, 200 meters average