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Brazil (RJ; type locality), Colombia, Costa Rica. Costa Rica: Atlantic and southern Pacific slopes to 700m.
MCZC material from Colombia and Costa Rica is identified as sensitiva by E. O. Wilson.Natural History:
This species occurs in mature wet forest. It recruits to baits on the forest floor.
Pheidole sensitiva BorgmeierHNS
Pheidole sensitiva BorgmeierHNS 1959a: 316. Types Mus. Zool. Univ. Sao Paulo.
Etymology L sensitivaHNS, possibly referring to the sensory function of the long body hairs.
diagnosis A small, light reddish brown member of the diligensHNS group with moderately abundant to dense, very long, erect to semierect, often strongly curved hairs.
Major: sculpturing of head consists entirely of carinulae, which are limited to the anterior third of the head capsule and absent from the frontal lobes; promesonotal profde 3-lobed; pronotal humerus rounded in dorsal-oblique view; pilosity of gaster shorter and much denser than on the rest of the body. Minor: humerus rounded and pronotum smooth and shiny.
Measurements (mm) Holotype major: HW 0.94, HL 0.94, SL 0.64, EL 0.16, PW 0.48. Paratype minor: HW 0.58, HL 0.64, SL 0.76, EL 0.14, PW 0.38.
Color Major: light reddish brown; gaster a shade darker; appendages yellowish brown.
Minor: light brown, gaster a shade darker and appendages a shade lighter than head and mesosoma.
Range Known from the type series from Rio de Janeiro, a series from near San Juan de Arama, Meta, Colombia, and, according to Longino (1997), the Atlantic and Pacific slopes of Costa Rica to 700 m.
Biology In Costa Rica, Longino (1997) found the species in litter and recruiting to baits on the floor of rainforests.
figure Upper: holotype, major (tibia shown next to full-face view of head). Lower: paratype, minor. BRAZIL: Jacarepagua (Taquera), Rio de Janeiro. Scale bars = 1 mm.
Found most commonly in these habitats: 33 times found in mature wet forest, 7 times found in tropical wet forest, 8 times found in montane wet forest, 7 times found in montane wet forest, in matrix of pasture and forest, probabl old 2nd growth, 4 times found in wet forest, 2 times found in tropical rainforest, 1 times found in Puesto18,210G,10m, 6 times found in ridgetop cloud forest, isolated peak with oak trees, 1 times found in CCL 200, 3 times found in cloud forest, ...
Found most commonly in these microhabitats: 48 times ex sifted leaf litter, 24 times at bait, 5 times Hojarasca, 1 times Primary, 2 times sifted litter, 2 times Primary forest, 1 times foragers, 2 times ex sifted litter, 1 times at ground baits, 1 times Wet forest. Ex sifted leaf litter., 1 times Sobre Vegetacion, ...
Collected most commonly using these methods: 26 times baiting, 37 times miniWinkler, 13 times Winkler, 3 times Berlese, 8 times MaxiWinkler, 3 times Lure/Bait, 2 times bait, 3 times Malaise, 1 times Pitfall, 1 times Sweeping, 1 times 30 x 30 cm winkler (litter + 2 cm of soil), ...
Elevations: collected from 50 - 1070 meters, 403 meters average