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1- Explain the phylogenetic relationship between hagfish and lampreys. Use the terms agnatha, cyclostomes, craniates, vertebrates...

1- Explain the phylogenetic relationship between hagfish and lampreys. Use the terms agnatha, cyclostomes, craniates, vertebrates

2-- Fish represent a ‘not natural’ group. What word describes this type of group?

3- Give the name of the extinct group that many consider to be the most ancient jawed vertebrates.

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Answer #1

1. Lampreys and hagfish, are combinedly called as  cyclostomes or ‘agnathans’, they are the  jawless fish of surviving lineages. During vertebrate evolution, they  diverged early.  craniate has skull of hard bone or cartilage. Hagfishes and Hyperoartia (including lampreys), are the living member of this group Craniata.

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