Tag Archives: lampreys

Hagfish In hagfishes, unidirectional water flow through the serial muscular gill pouches is chiefly brought about by rolling and unrolling of velar folds. These lie in a chamber developed from the naso-hypophyseal tract and are operated by a complex set of muscles inserting onto cartilages of the neurocranium. Peristaltic contractions …

Lampreys share with gnathostomes a more advanced kidney than hagfish, a pho-tosensitive pineal, a lateral line, radial muscles in the fins, functional eyes, extrin-sic eye muscles, neural and hemal vertebral elements formed around the notochord, and similarities in pituitary histology. These features have strongly suggested to some that hagfish is …