Concise hierarchy

Current position

Deuterostomia ([unranked]) Grobben, 1908

Ref: M.J. Benton, 2015: fig. 1.6 (G. Edgecombe). [out of scope (coherent)]

Ref: C. Nielsen, 2001: fig. 1.2.

*Deuterostomia* ([unranked]) Grobben, 1908	Ref: M.J. Benton, 2015: fig. 1.6 (G. Edgecombe). [alternative rank]
*Chordata* (Phylum) Bateson, 1885	Ref: J.J. Sepkoski Jr., 2002: 298 (Romer, 1966).
*Cyrtotreta* ([unranked])	Ref: C. Nielsen, 2001: 450-463, fig. 1.2.
*Cyrtotreta* ([unranked])	Ref: C. Nielsen, 1995

2015	M.J. Benton: fig. 1.6 (G. Edgecombe)	[3p]
1995	C. Nielsen	[3p]