which of the following is the sister taxon to the Vertebrata?
Actinopterygii
Actinistia
Agnathans
Ambulacraria
Cephalochordata
Chondrichthyes
Chordata
Cyclostomata
Dipnoi
Deuterostomia
Hemichordata
Echinodermata
Gnathostomata
Myxiniformes
Olfactores
Osteichthyes
Petromyzontiformes
Rhipidistia
Sarcopterygii
Tetrapoda
Urochordata
Vertebrata
None of the above
