Simplified
procursus(Huber 2000)
A procursus that consists of a simple lobe or rod occurs in Tolteca, Pholcophora, Papiamenta, but is similar also in Ninetis and Nerudia. In Gertschiola and Ibotyporanga the procursus is long but actually also extremely simle in shape.
A simple procursus may eventually turn out to be primitive.