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Types Mus. Hist. Nat. Geneve (syntype minor only; major not located, may be in the Musee de Bruxelles, the source of Forel's material).
Diagnosis A member of the tristisHNS group, similar (in the minor caste, the only one available in this study) to excubitorHNS, grandinodusHNS, and obrimaHNS in the greatly enlarged postpetiole and overall habitus, differing in the shallow, nearly flat venter of the postpetiole in side view; constricted ventral margin of the postpetiolar node from above; much longer antennal scapes; and more prominent nuchal collar.
Measurements (mm) Syntype minor: HW 0.74, HL 1.02, SL 1.32, EL 0.20, PW 0.52. Color Minor: concolorous dark yellow.
Range Known only from the type locality.
Figure Syntype, minor. FRENCH GUIANA: Cayenne. Scale bar = 1 mm.
Type specimens: syntype of Pheidole severini: casent0908117
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