An understanding of gonorynchiform morphology and systematic inter- and intra-relationships has proven vital to a better understanding of the evolution of lower teleosts in general, and more specifically of groups such as the clupeiforms (e.g., herrings and anchovies), and ostariophysans (e.g., carps, minnows and catfishes). This book examines the current knowledge of gonorynchiform biology, including comparative osteology, myology, epibranchial morphology and development. Phylogenetic interrelationships among gonorynchiform fishes are reexamined.