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Types Mus. Civ. Stor. Nat. Genova.
Major: small and dark; occiput with very broad, moderately deep median occipital concavity in full-face view; humerus in dorsaloblique view a low, smooth convexity that runs almost indistinguishably into the mesothorax; mesothoracic convexity extremely reduced, barely visible; postpetiolar node oval; weak longitudinal carinulae cover sides of pronotum.
Minor: humerus with low blunt denticle in dorsal-oblique view; pronotum and mesonotum indistinguishable in a single profile; mesonotal convexity absent.
Color Major and minor: body concolorous medium brown, appendages brownish yellow.
Range Known from Bolivia and Peru.
figure Upper: major (syntype of synonymous P. dimidiata EmeryHNS). Lower: minor (syntype of synonymous P. dimidiata EmeryHNS). BOLIVIA: Salinas, Rio Beni, Bolivia; Luigi Balzan. (Type locality of nigellaHNS: also Salinas, Rio Beni, Bolivia; Luigi Balzan.) Scale bars = 1 mm.
Found most commonly in these habitats: 1 times found in lowland wet forest, 1 times found in mature wet forest.
Found most commonly in these microhabitats: 1 times ex dead wood, 1 times at bait.
Collected most commonly using these methods: 1 times Baiting, 1 times search.
Elevations: collected at 160 m
Type specimens: Lectotype of Pheidole dimidiata: casent0904426; Lectotype of Pheidole fabricator nigella: casent0904379; paralectotype of Pheidole dimidiata: casent0904427; paralectotype of Pheidole fabricator nigella: casent0904380