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Answer on Zoology Question for Sanjukta Ghosh

Question #63062
I have been reading Classification of Pisces by Romer 1966 and stumbled upon these two characters:
Members of series Pisces have paired and unpaired fins supported by SOFT or spiny fin rays.
Soft fin rays are fin rays that are flexible, non-rigid, SEGMENTED and sometimes branched.

While again as a character of Actinopterygii subclass the book mentioned that they have fins supported by ''JOINTED radiating rays''.

What does Jointed radiating rays mean? Does it mean that members of actinoptrygii have only soft fin rays?

P.S. I'm confused.Explain in a very simple manner, if you please.
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