Pseudorchomene plebs (Hurley 1965)

are eaten by

• Global Biotic Interactions: Trematomus bernacchii Boulenger 1902 (Emerald rockcod)
• Global Biotic Interactions: Pygoscelis adeliae (Hombron & Jacquinot 1841) (Adelie Penguin)
• Global Biotic Interactions: Sterna vittata Gmelin & JF 1789 (Antarctic Tern)

are preyed upon by

• Global Biotic Interactions: Liljeborgia georgiana Schellenberg 1931
• Global Biotic Interactions: Sterna vittata Gmelin & JF 1789 (Antarctic Tern)
• Global Biotic Interactions: Pogonophryne permitini Andriashev 1967 (Finespotted plunderfish)
• Global Biotic Interactions: Trematomus bernacchii Boulenger 1902 (Emerald rockcod)
• Global Biotic Interactions: Pogonophryne scotti Regan 1914 (Saddleback plunderfish)

eat

• Global Biotic Interactions: Pseudosagitta gazellae (Ritter-Záhony 1909)
• Global Biotic Interactions: Porosira glacialis
• Global Biotic Interactions: Calanoides acutus (Giesbrecht 1902)
• Global Biotic Interactions: Nitzschia neglecta
• Global Biotic Interactions: Thalassiosira australis

prey on

• Global Biotic Interactions: Euphausia superba Dana 1850 (Antarctic Krill)
• Global Biotic Interactions: Metridia gerlachei Giesbrecht 1902
• Global Biotic Interactions: Laackmanniella naviculaefera (Laackmann 1907) Kofoid & Campbell 1929
• Global Biotic Interactions: Calanoides acutus (Giesbrecht 1902)
• Global Biotic Interactions: Codonellopsis gaussi