Date: Summer 2013
Of the ("true") fish with clenoid and cycloid scales; is there some sub class or order or family (families) that identifies them as opposed to fish with other forms of scales?
Thanks for the question. I am not sure of the answer, but I would recommend searching in an evolutionary biology textbook, or perhaps a scientific journal. You may want to search the (free) PubMed database or Library of Congress catalog. You will need some patience to do the research necessary to answer your question.
I hope this provides some help. Please let me know if you have more questions.
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Update: November 2011