So many spiny knobs

I found conflicting diagrams, both from published books, on whether the fertilizing clasper is anterior or posterior to the spiny knob clasper. It might vary between species.

References: Klimley, A.P., 2013. The biology of sharks and rays. University of Chicago Press.

By Linda Snook / MBNMS – http://www.mbnms-simon.org/other/photos/photo_info.php?photoID=1307, Public Domain, https://commons.wikimedia.org/w/index.php?curid=1935773

This is a series of little illustrated factoids about animal reproduction, posted daily. I’d love to hear your suggestions/ feedback. I also post these on my insta.

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