Perfect for anything frosty cold or piping hot. See your drink peeking through your photos, images, or text designs. Dishwasher and microwave safe. Makes a unique gift. Get a set of two for you and a friend. Imported.
Sharks are a group of fishes characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head.
Modern sharks are classified within the clade Selachimorpha (or Selachii), and are the sister group to the rays.
However, the term "shark" has also been used for extinct members of the suborder Elasmobranchii outside the Selachimorpha, such as Cladoselache and Xenacanthus.
Under this broader definition, the earliest known sharks date from more than 421 million years ago.