Hello, Could someone please me tell how to distinguish between the following Nodipecten species? arthriticus vs. subnodosus fragosus vs. nodosus In addition, I can find very little literature on arthriticus. Does anyone know of any besides Reeve? Thank you in advance, Ghost Sheller [log in to unmask] ________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com