This web page would not have been possible without the help and support of the following individuals: Dr. Rich Mooi lent generously of his time in reviewing the content of the page. Dr. Tom Niesen, San Francisco State University provided many of the photographs in the Classification section. Gabby Mascardo and Zinaida Beynon were patient and generous in their time helping to put this page up. A short thanks to Cory Pittman for his significant editorial comments on the echinoid classification section. And finally, thanks to Marilyn Eversole for keeping this website up-to-date and for her design talents and creativity. Thanks to all!