The first and third images show the 'teeth' on the undersurface which idenyifies this species, along with colour and statue. However your second image shows mainly show a series of small lumps. I've never seen this before and can only sumise these are immature teeth. What do you think Teresa? Interesting image.
As its possible to see 'teeth' on the the far right of image, I also assume its an immature form however, I've never found it at this stage before - very interesting find and new for our local area - well done and terrific capture.