The upcoming discussion will update you about the difference between lampreys and hagfish. Difference # Lamperys: 1. Habit and habitat: Live usually in the sea and migrate to the rivers for spawning. The adult are semi-parasitic but the larva leads independent life. 2. Shape of the body: The body is cylindrical and stout. 3. Fins: The dorsal fin is divided [...]
In this article we will discuss about the modern concept on the phylogenetic status of cyclostomata. In this history of vertebrate evolution the cyclostomes occupy a doubtful status. Diverse opinions exist on the relative status of the cyclostomes in the vertebrate series. Cyclostomes are generally regarded to be lower in structural organisation than the fishes (Gnathostoma) but higher than Branchiostoma [...]
In this article we will discuss about the historical resume and classification of jawless vertebrates. Historical Resume: L. Agassiz (1857) placed the agnaths under the class Myzontes and proposed the following scheme for the lampreys and hagfishes: Class I. Myzontes. Order 1. Myxinides and Order 2. Cyclostomi. E. S. Goodrich (1909) gave the following classification in his book "Cyclostomes and [...]