Catoptrophorus semipalmatus

are host of

• Global Biotic Interactions: Parorchis catoptrophori
• Global Biotic Interactions: Paramaritremopsis stunkardi
• Global Biotic Interactions: Paramaritremopsis stunkardi
• Global Biotic Interactions: Paramonostomum actitidis
• Global Biotic Interactions: Himasthla catoptrophorus

are parasitized by

• Global Biotic Interactions: Paramonostomum actitidis
• Global Biotic Interactions: Ophthalmotrema semipalmatus
• Global Biotic Interactions: Himasthla catoptrophorus
• Global Biotic Interactions: Renicola glandoloboides Byrd & Heard 1970
• Global Biotic Interactions: Levinseniella hunteri Heard 1968

eat

• Global Biotic Interactions: Emerita analoga (Stimpson 1857) (Pacific Mole Crab)
• Global Biotic Interactions: Pollicipes polymerus Sowerby 1833 (goose-necked barnacle)
• Global Biotic Interactions: Emerita analoga (Stimpson 1857) (Pacific Mole Crab)
• Global Biotic Interactions: Ocypode quadrata (Fabricius 1787) (Atlantic Ghost Crab)

prey on

• Global Biotic Interactions: Mytilus galloprovincialis Lamarck 1819 (Mediterranean mussel)
• Global Biotic Interactions: Geukensia demissa (Dillwyn 1817) (ribbed mussel)
• Global Biotic Interactions: Ilypnus gilberti (Eigenmann & Eigenmann 1889) (Cheekspot goby)
• Global Biotic Interactions: Bittium quadrifilatum
• Global Biotic Interactions: Macoma nasuta (Conrad 1837)