Grey reef shark (Carcharhinus amblyrhynchos)
•Conservation status: IUCN Red Listed as ‘Near Threatened’
•Grey reef sharks have a typical reef shark appearance, greyish coloring on the topside fading to white underneath, reaching sizes of about 2.5 meters (~ 7 ft.) in length, but they can be identified by a distinct black edge of the tail.
Great white shark (Carcharodon carcharias)
•Conservation status: IUCN Red Listed as ‘Vulnerable’; listed on CITES (Convention on International Trade in Endangered Species) Appendix II, restricting the international trade of this species.
•In Australia and New Zealand they are often referred to as “white pointers.”
Everything you want to know about hammerhead sharks: Behavior, size, where to dive with hammerheads, and more!
**__**Caribbean reef shark **_([Carcharhinus perezi](http://www.scubadiving.com/photos/marine-life-guide-sharks))_**
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•Conservation status: IUCN Red Listed as ‘Near Threatened’
•Sometimes known in Spanish as ‘cabeza dura’ meaning thick skull.
**_Bull shark (Carcharhinus leucas)_**
•Conservation status: IUCN Red Listed as ‘Near Threatened’
•Common names include Zambezi shark, Swan River shark, and Lake Nicaragua shark.
Broadnose sevengill shark (Notorynchus cepedianus)
•Conservation status: IUCN Red Listed as ‘Data Deficient’
•These unique sharks get their name from having seven paired gill slits compared to more ‘modern’ sharks having five pairs; they have only one dorsal fin.
**_Blue shark (Prionace glauca)_**
•Conservation status: IUCN Red Listed as ‘Near Threatened’
•In some countries and fisheries they are called ‘blue dogs’.
Blacktip reef shark (Carcharhinus melanopterus)
**·**Conservation status: IUCN\* listed as ‘Near Threatened’
**·**Their common name comes from their distinct dorsal fins with black or dark brown tips.
For thousands of years sea monsters have appeared on maps as both warnings to travelers and as decorations. Chet Van Duzer explores these monsters in his new book _Sea Monsters on Medieval and Renaissance Maps _and gives readers a better understanding of their place and purpose in history.