Abstract
Mastigospirura cubicipitis gen. et sp. nov. (Nematoda, Cystidicolidae) is described for specimens collected from the intestine of a driftfish, Cubiceps sp. from Ambon of Indonesia. The new genus is distinguished from the closely related genera Ascarophis and Neoascarophis by having the mouth opening without lateral notches and surrounded by two lateral pseudolabia which are attached medially to the lateral edge of the mouth opening, lacking submedian labia and sublabia, and having 14 pairs of preanal papillae in the male.
