Aspidosiphon steenstrupii
- kingdom: Animalia
- phylum: Sipuncula
- class: Phascolosomatidea
- order: Aspidosiphoniformes
- family: Aspidosiphonidae
- genus: Aspidosiphon
- species: Aspidosiphon steenstrupii
Port Nelson
Rum Cay
Bahamas
Saipan
Saipan
Northern Mariana Islands