Consider the following as major groups of living Vertebrates: jawless fishes, cartilaginous fishes, bony fishes, amphibians,...

Consider the following as major groups of living Vertebrates: jawless fishes, cartilaginous fishes,

bony fishes, amphibians, reptiles, birds & mammals.
1. About how many species are recognized in each of these groups?
2. Two of these groups are paraphyletic. Identify which groups they are and explain clearly what makes each of them paraphyletic.

Solutions

Expert Solution

Jawless fish-100 species

Cartilaginous fish-980

Bony fish-28000

Amphibians-8000 where 90% are frogs

reptiles-10000

mammals-5450

Birds-10000

A paraphylectic group is a group of organisms that includes an ancestor but only some of its descendants.for example in your family your parents are the ancestors and you and your siblings are descendants.If any one of your siblings is left out of the group then the group is paraphylectic because it contains all ancestors not all descendants.

Jawless fish and reptiles are paraphylectic

Jawless fish comprise of all ray ray finned fish but exclude but exclude terrestrial descendants of fleshy finned fish.

Reptiles comprise of scaly tetrapods but exclude mammals and aves(birds)

gladiator answered 1 year ago

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