Ammonite sculpture question

[james herrmann]

I am sculpting an ammonite which will be hunting through kelp fronds.  The ammonite i want to use for this sculpture is crioceratites or something closely related.  I like the spines and overall shape.  My question is how many spines around each band of the shell?  Five or six?  Thanks for any help you might provide.

[Ludwigia]

Check out this photo and then you can figure out the rest for yourself.  

[james herrmann]

Thank you for replying to my question, I was looking at this same image, have purchased and am reading the book by Wolfgang Grulke.  I count the spines and based on the side that I can see believe that there are five.  I asked this question of Mr. Grulke who was kind enough to get back to me.  He said that the number varies between species but as a general rule of thumb the number is usually an even one.  Perhaps if someone had an image looking straight into the living chamber I could see the number and placement of the spines.  I am attaching two images, one of my work and one of the heteromorph ammonite I want to sculpt next.

[Ludwigia]

The logical conclusion for me is that there are 5 spines on this particular species. Nice work, by the way!

[james herrmann]

Thank you, that is what it looks like to me as well but it is reassuring to get the confirmation

[Ptychodus04]

Beautiful sculpture!