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Costa Rica: Montane regions from 500 to 1600m (Monteverde area, Braulio Carrillo, Cerro Pittier).
This species is common in Winkler samples from mature wet forest. Two nests have been observed, one in rotten wood on the ground, the other under loose bark of a dead tree trunk on the ground.
types Mus. Comp. Zool. Harvard.
diagnosis Similar to the species listed in the heading above, differing as follows.
Major: light brown; head strongly flattened dorsoventrally, so that in side view it is narrowly rectangular; in addition, the head and mandibles together in full-face view are heart-shaped or (adding flattening top to bottom) shaped like an arrowhead; propodeal spines reduced to denticles; apex of petiolar node pointed; carinulae cover most of anterior fourth of dorsal head surface, and almost all of the rest of the body smooth and shiny.
Minor: eye very large, oval, set far forward on head; propodeal spines reduced to denticles; almost all of head and body smooth and shiny.
measurements (mm) Holotype major: HW 0.72, HL 0.76, SL 0.38, EL 0.10, PW 0.34. Paratype minor: HW 0.34, HL 0.36, SL 0.32, EL 0.06, PW 0.22. Color Major: body light brown, appendages yellowish brown. Minor: body yellowish brown, appendages dark yellow.
Range Mostly montane regions of Costa Rica from 500 to 1600 m (Longino 1997).
Biology According to Longino (1997), sagittariaHNS is common in mature wet forests. The two nests he found were, respectively, in a piece of rotten wood on the ground and under the loose bark of a dead tree trunk.
Figure Upper: holotype, major. Lower: paratype, minor. COSTA RICA: Rio Toro Amarillo, near Guapiles, Limon (W. L. Brown). Scale bars = 1 mm.
Found most commonly in these habitats: 28 times found in mature wet forest, 17 times found in wet forest, 21 times found in montane wet forest, 8 times found in cloud forest, 1 times found in wet forest edge, 2 times found in Primary wet forest, 1 times found in rainforest, 2 times found in 2nd growth veg., 2 times found in montane moist forest, 1 times found in moist forest, ...
Found most commonly in these microhabitats: 47 times ex sifted leaf litter, 16 times Hojarasca, 1 times under dead bark, 1 times nest in rotten wood, 2 times nest in treefern base, 3 times at bait, 1 times sifted litter (leaf mold, rotten wood), 1 times nest in dead stick, 1 times nest in dead stem, 2 times at baits, 1 times sifted leaf litter, ...
Collected most commonly using these methods: 28 times miniWinkler, 16 times Mini Winkler, 16 times Winkler, 6 times Search, 7 times maxiWinkler, 3 times bait, 3 times Berlese, 2 times baiting, 1 times Sweeping.
Elevations: collected from 50 - 1670 meters, 780 meters average
Type specimens: paratype Pheidole sagittaria: jtlc000016520