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Costa Rica: Atlantic slope to 1100m.
This species occurs in wet forest. Workers have not been observed at baits or in Winkler samples. Three nests have been observed in Cecropia sapling internodes, one in the foliar pouches of a myrmecophytic melastome, and one in a dead stick in the leaf litter. When the dead stick was cracked, two Pheidole nests were found, one of this species and one of Pheidole scrobifera (JTL0219). The two nests were separated by a 1cm plug of sawdust. When they mixed, fighting ensued.
Diagnosis A medium-sized, concolorous yellow species whose major is distinguished by the slightly concave profile of the posterior half of the head capsule; also possessing a carpet of dense, evenly short, forward-projecting, subdecumbent (45AÃ‚Â°-angled from surface) hairs on the posterior half of the head and occiput; weak but distinct mesonotal convexity; and short, nearly vertical propodeal spines.
Similar to anguliferaHNS, bolivianaHNS, crinitaHNS, melastomaeHNS, mixtecaHNS, scitulaHNS, terresiHNS, and tysoniHNS, but readily distinguished by the above traits as well as by various differences in sculpture and color.
Measurements (mm) Holotype major: HW 0.94, HL 1.14, SL 0.52, EL 0.14, PW 0.48.
Paratype minor: HW 0.60, HL 0.66, SL 0.60, EL 0.14, PW 0.36.
color Major: concolorous medium yellow.
Minor: gaster dark yellow, rest of body medium yellow.
Range Reported by John T. Longino (1997) from the Atlantic slope of Costa Rica to 1100 m.
Biology According to Longino (1997), amabilisHNS occurs in wet forest. Nests have been found in Cecropia sapling internodes, in foliar pouches of a myrmecophytic melastome, and in a dead stick in leaf litter. The colony in the dead stick was separated from a colony of Pheidole scrobiferaHNS by a plug of woody frass; fighting between the two species ensued when the plug was removed.
figure Upper: holotype, major. Lower: paratype, minor. COSTA RICA: Rio Penas Blancas, Alajuela, WWN 84AÃ‚Â°42 W, 800 m (J. T. Longino). Scale bars = 1 mm.
Found most commonly in these habitats: 24 times found in montane wet forest, 2 times found in wet forest, 1 times found in lowland rainforest, 1 times found in mesophil forest.
Found most commonly in these microhabitats: 1 times under epiphytes in treefall, 1 times Edge between primary forest and large area of low secondgrowth. Pheidole nest in, 1 times Wet forest. Mary Cornelius, OTS student, did field project sampling ants from do, 1 times Primary forest. Pheidole nest in 1 internode of Cecropia insignis., 1 times Sura, 1 times Sobre Vegetacion, 1 times Muestra tomada alrrededor de M/20, 1 times in dead stick in litter, 1 times ex sifted leaf litter, 1 times bajo de M/16, 1 times bajo de M/06, ...
Collected most commonly using these methods: 21 times Malaise, 1 times search, 2 times flight intercept trap, 1 times Berlese, 1 times MiniWinkler, 1 times Sweeping.
Elevations: collected from 5 - 1100 meters, 480 meters average
Type specimens: holotype major Pheidole amabilis: inbiocri002279941; Paratype Pheidole amabilis: casent0610089, casent0610090; paratype Pheidole amabilis: inbiocri001280274, inbiocri001280310, inbiocri002279939, inbiocri002279942