Apterostigma angulatum Weber, 1938 junior synonym of current valid taxon Apterostigma dentigerum Wheeler, 1925
Apterostigma collare subsp. angulatum Weber, 1938b: 169, figs. 4, 12 (w.q.) PANAMA. Neotropic.
Primary type information: Primary type material: 11 syntype workers, 1 syntype queen. Primary type localities: Panama: Canal Zone, Barro Colorado I., 25.vi.1924, no. 561 (W.M. Wheeler), Canal Zone, Barro Colorado I., 22.vii.1924, no. 739 (W.M. Wheeler), Canal Zone, Fort Sherman, 3.vii.1924, nos 595-6 (W.M. Wheeler). Primary type depository: MCZC (perhaps also AMNH).
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