Pliotrema Directory References Discover Cruel and Unusual Punishments: 15 Types of Torture 10 of the World’s Most Dangerous Fish Why Is Ireland Two Countries? Timeline of the Titanic’s Final Hours Where Is “Old Zealand”? Causes of the Great Depression 12 Novels Considered the “Greatest Book Ever Written” Contents Pliotrema shark genus Ask the Chatbot a Question Ask the Chatbot a Question Learn about this topic in these articles:saw sharks In saw shark…two genera of saw sharks: Pliotrema, with six pairs of gill openings, and Pristiophorus, with five.Read More