Cystoseira osmundacea

are eaten by

• Global Biotic Interactions: Haliotis corrugata W. Wood 1828
• Global Biotic Interactions: Pugettia producta (crabe des laminaires)
• Global Biotic Interactions: Norrisia norrisi (G. B. Sowerby II 1838)
• Global Biotic Interactions: Haliotis rufescens Swainson 1822
• Global Biotic Interactions: Haliotis kamtschatkana Jonas 1845

are host of

• Global Biotic Interactions: Haloguignardia irritans (Setch. & Estee) Cribb & J. W. Cribb 1956
• Global Biotic Interactions: Haloguignardia irritans (Setch. & Estee) Cribb & J. W. Cribb 1956

are preyed upon by

• Global Biotic Interactions: Aplysia californica J. G. Cooper 1863
• Global Biotic Interactions: Norrisia norrisi (G. B. Sowerby II 1838)
• Global Biotic Interactions: Haliotis corrugata W. Wood 1828
• Global Biotic Interactions: Pugettia producta (crabe des laminaires)
• Global Biotic Interactions: Megathura crenulata (Sowerby I 1825)