Question

General organizations of cyclostomata

Answer 1

The cyclostomata evolved oxygen transport hemoglobin independently from the jawed vertebrates .A thymus and spleen is absent in both hagfishes and lampreys ...Brachial basket (reduced hagfishes)is attached to the cranium
Phylum :chordata
Superclass:cyclostomata,dumeril
subphylum:vertebrate
kingdom:Animalia

HOPE THIS ANSWER WILL HELP YOU
OKK