Pentanymphon antarcticum Hodgson 1904

are eaten by

• Global Biotic Interactions: Trematomus bernacchii Boulenger 1902 (Emerald rockcod)
• Global Biotic Interactions: Trematomus bernacchii Boulenger 1902 (Emerald rockcod)
• Global Biotic Interactions: Notothenia neglecta Nybelin 1951 (Yellowbelly rockcod)

are preyed upon by

• Global Biotic Interactions: Artedidraco orianae Regan 1914
• Global Biotic Interactions: Harmothoe spinosa Kinberg 1856
• Global Biotic Interactions: Trematomus bernacchii Boulenger 1902 (Emerald rockcod)
• Global Biotic Interactions: Notothenia neglecta Nybelin 1951 (Yellowbelly rockcod)
• Global Biotic Interactions: Antarctinoe spicoides (Hartmann-Schröder 1986)

prey on

• Global Biotic Interactions: Trematomus hansoni Boulenger 1902 (Striped notothen)
• Global Biotic Interactions: Notaeolidia gigas Eliot 1905
• Global Biotic Interactions: Tedania vanhoeffeni
• Global Biotic Interactions: Terebella ehlersi Gravier 1907
• Global Biotic Interactions: Systenopora contracta