Phylum Echiura
Synonym: Echiurida
Parent taxon: Chaetifera according to J. Zrzavy et al. 1998
See also Sepkoski 2002
Sister taxon: Pogonophora
Subtaxa: Coprinoscolex
Synonym: Echiurida
Parent taxon: Chaetifera according to J. Zrzavy et al. 1998
See also Sepkoski 2002
Sister taxon: Pogonophora
Subtaxa: Coprinoscolex