Although all cartilaginous fish species shared certain key d…
Although all cartilaginous fish species shared certain key defining traits (that is, the synapomorphies of the Chondrichthyes), members of certain groups within the Class Chondrichthyes share certain traits that set them apart from other chondrichthyans. As you may remember, these are often known as apomorphies – features that set a particular clade apart from ALL OTHER clades. Which of the following is an apomorphy of the Subclass Holocephali?
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