Key for species of Fascaplysinopsis

1. Sponge burrowed in sediment............................................... Fascaplysinopsis ronquinni sp. nov.

- Sponge not burrowing................................................................................. 2

2. Secondary and tertiary fibres not pithed............................................... Fascaplysinopsis reticulata

- Secondary and tertiary fibres heavily pithed................................................................ 3

3. Cored primary fibres surrounded by cage of secondary fibres.......................... Fascaplysinopsis klobos sp. nov.

- Cored primary fibres with simple attachments to secondary fibres.................. Fascaplysinopsis palauensis sp. nov.