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BiologyS. filicornis probably spawns in autumn or winter, releasing large eggs. Planktonic larvae are found from February to April. S. filicomis builds fragile tubes of sand fragments. lt swims in spirals when disturbed. Spionids are generally considered surface deposit feeders that use their large ciliated palps to select and pick up food particles (Hartmann-Schröder, 1971; Curtis, 1977; Hayward & Ryland, 1990).