Key to the species of Neophrissospongia

1 Growth form cup- to ear-shaped with small inhalant and large exhalant apertures on opposite sides of the lamella bearing an ectosomal skeleton of dichotriaenes, styles/sub-tylostyles and aster-like microscleres........... N. nolitangere

– Growth form clavate to plate-like with inhalant and exhalant areas in different regions of the same sponge surface........................................................ 2

2 Growth form clavate, ectosomal skeleton of dichotriaenes and styles/subtylostyles................................................................................ N. microstylifer

– Growth form plate-like, ectosomal skeleton of dichotriaenes, styles/sub-tylostyles and aster-like microscleres........................................... N. nana nov. sp.