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" ... Chimaeras are a small group of cartilaginous fishes (collectively called Chondrichthyes or Chondrichthyans) that form the subclass Holocephali and are the sister group to sharks, skates, and rays. They were separated from the rest of Chondrichthyes around 360 million years ago. They aren’t true sharks, even though nicknamed "ghost sharks." Other common names include "ratfish," "rabbitfish," "elephant fish," or "spookfish" and these mysterious animals belong to three families even though they are often lumped into one. The Callorhinchidae family is made up of the ploughnose chimaeras, the Chimaeridae family consists of the shortnose chimaeras, and the Rhinochimaeridae family of the longnose chimaeras. ... "
" ... One of the most exciting things for any fossil lover is finding just that: a fossil! Shark teeth are often the only links we have to ancient sharks due to their cartilaginous skeletons not being able to withstand the test of time. While many believe all sharks look the same, this isn’t the case today nor was it the case thousands of years ago. This same train of thought applies to shark teeth, each sporting a unique shape based on the shark’s diet. ... "
" ... That was the question posed to scientist Dr. Helen Dooley, who studies the evolution of the immune system. Much of her work focuses on understanding the immune responses of sharks, skates, rays, and chimera. "Basically, cartilaginous fishes are the furthest we can go back in evolutionary time and find an immune system based on the same molecules as humans. By studying shark immunity we can get an idea of the molecules and mechanisms that were present right at the beginning of this system, then trace the changes that have made to the system between then and the emergence of mammals (including humans)," she explained. Not only that, but researchers also get to understand how these ancient animals protect themselves from infection – which is now pertinent information as scientists assess the impact of various environmental changes upon their health and if it impacts their ability to survive. ... "
" ... There are over 1,000 species of cartilaginous fish roaming in our oceans. These fish include sharks and their relatives, the batoid fishes (including skates, rays, guitarfishes, and sawfishes) and chimaeras. Skates and rays are often known as #flatsharks on social media since both animals are usually flat and sport a long tail. ... "
" ... To determine the details of the cartilaginous monster’s life cycle, scientists took a close look at some vertebrae from the ancient species. In particular they looked at growth bands within the bones, which is sort of like looking at the rings of a tree. This allowed the researchers to calculate how large the sharks were at birth. ... "