Synonyms: Cryptosoma strombi; Cryptosomum spitzbergense; Golfingia intermedia (heterotypic); Phascolion africanum; Phascolion alberti; Phascolion anomalus; Phascolion artificiosum; Phascolion artificiosus; Phascolion brotzkajae; Phascolion caementarium; Phascolion intermedia; Phascolion mogadrense; Phascolion spetsbergense; Phascolion spitzbergense; Phascolion strombi (homotypic); Phascolion strombi africanum; Phascolion strombi canadensis; Phascolion strombi fusca; Phascolion strombi gracilis; Phascolion strombi hyalina; Phascolion strombi laevis; Phascolion strombi tubicola; Phascolion strombi tubicula; Phascolion strombi var. alba; Phascolion strombi var. canadiensis; Phascolion strombi var. capitatum; Phascolion strombi var. fusca; Phascolion strombi var. gracilis; Phascolion strombi var. hyalina; Phascolion strombi var. laevis; Phascolion strombi var. ochotensis; Phascolion strombi var. tubicola; Phascolion strombi var. verrucosum; Phascolion strombus canadensis; Phascolion strombus fusca; Phascolion strombus gracilis; Phascolion strombus hyalina; Phascolion strombus laevis; Phascolion strombus tubicola; Phascolion tortum; Phascolion tubicolum; Phascolion tubiculum; Phascolosoma bernhardus; Phascolosoma bernhardus var. capitata; Phascolosoma coementarium; Phascolosoma concharum; Phascolosoma hamulatum; Phascolosoma intermedium (heterotypic); Phascolosoma strombi; Phascolosoma strombi var. spitsbergense; Phascolosoma strombi var. verrucosum; Phascolosoma tubicola; Phascolosomum bernhardus; Phascolosomum bernhardus var. capitata; Phascolosomum capitatum; Phascolosomum dentalii; Phascolosomum strombi; Siphunculus dentalii; Siphunculus strombus; Sipunculus bernhardus; Sipunculus bernnhardus; Sipunculus caementarius; Sipunculus capitatus; Sipunculus coementarius; Sipunculus concharum; Sipunculus dentalii; Sipunculus strombi (homotypic); Sipunculus strombus (homotypic)