Subeucalanus pileatus

are eaten by

• Global Biotic Interactions: Ariopsis felis (Linnaeus 1766) (Hardhead Catfish)

are preyed upon by

• Global Biotic Interactions: Rhincalanus nasutus Giesbrecht 1888
• Global Biotic Interactions: Scomber japonicus Houttuyn 1782 (Pacific Chub Mackerel)
• Global Biotic Interactions: Clione limacina (Phipps 1774) (Sea Angel)
• Global Biotic Interactions: Etheostoma olmstedi Storer 1842 (Tessellated Darter)
• Global Biotic Interactions: Membras martinica (Valenciennes 1835) (Rough Silverside)

prey on

• Global Biotic Interactions: Labidocera aestiva Wheeler 1900
• Global Biotic Interactions: Zausodes arenicolus Wilson C. B. 1932
• Global Biotic Interactions: Parvocalanus crassirostris (Dahl F. 1894)
• Global Biotic Interactions: Halicyclops magniceps (Lilljeborg 1853)
• Global Biotic Interactions: Leptinogaster major (Williams 1907)