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Zenkevitch L. A. (1966). The systematics and distribution of abyssal and hadal (ultra-abyssal) Echiuroidea. Galathea Report. 8: 175–184.
Zenkevitch L. A. (1966). The systematics and distribution of abyssal and hadal (ultra-abyssal) Echiuroidea. Galathea Report. 8: 175–184.