Tag Archives | Jawless Vertebrates

Phylogenetic Status of Cyclostomes | Jawless Vertebrates

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 [...]

By |2016-07-22T08:09:50+00:00July 22, 2016|Phylum Chordata|Comments Off on Phylogenetic Status of Cyclostomes | Jawless Vertebrates

Jawless Vertebrates: Historical Resume and Classification

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 [...]

By |2016-07-22T08:09:50+00:00July 22, 2016|Phylum Chordata|Comments Off on Jawless Vertebrates: Historical Resume and Classification
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