Chondrichthyes

Sharks don’t fossilize well because they’re from the class of chondrichthyes meaning their skeletons are made of cartilage, a flexible connective tissue. This is one of the reasons why there is a disagreement over when the first shark first existed. However, shark teeth do fossilize well and sharks produce thousands of teeth in a lifetime. The oldest shark teeth date back to the Devonian Period about 400 million years ago and were found in Europe. Shark scales also fossilize well.…

breathing it is called buccal pumping. Buccal pumping is when they pumped all the water through their mouth and over their gills. Skates and rays which are the whale sharks cousins also breathe this way. That means that they belong to the group called Chondrichthyes. Whale sharks have a distinct pattern of polka dots, and lines on them. These patterns help the shark stand out from all the other sea creatures. Every whale shark has different spots in different places. There spots and lines are…

mankind. As time goes on, their fatal image is beginning to fade and possibly people will begin to understand that the harm they are causing is unintentional. The great white sharks scientific name is the “Carcharadon carcharias,” their class is “Chondrichthyes,” and their order is “Lamniformes.” They are the largest known predatory fish in the sea. Their average size is fifteen to twenty feet long (about the…

The Squalus acanthus is nicknamed the dog fish because they are known to feed in packs which is similar to the habits of dogs, according to the Monterey Bay Aquarium website. These sharks are classified as chondrichthyes (“Squalus Acanthias”). According to the article Spiny Dogfish, the dogfish’s relatives include the Pygmy shark and the Sleeper shark. The Squalus acanthus has an endoskeleton skeleton type. They live in the interdial zone up to 900 meters deep. The dogfish sharks swim in water…

their behaviour, their speed, their camouflage, their defense mechanisms moulded by the shark.” – Paul Watson. Sharks are cartilaginous fish with pair fins and nares, two chambered hearts and jaws. These characteristics are unique to the class, chondrichthyes. Ray, skates, and chimaeras are members of this class and sharks closest relatives. Shark fossil aren’t like dinosaur fossils, because sharks skeletons are made of cartilage (a connective tissue) they don’t fossilize well at all. However…

Maverick Wagner Evolution 2/20/15 Evolution of the Great White Shark Did you know that sharks appeared in the fossil record about 450 million years ago? The great white shark is one of many different species of cartilaginous fish out. There are approximately 350 species of sharks worldwide. The great white has become one of the most feared predators in the sea leaving the question as to how it achieved this success. The great white is about four to six meters in length and can weigh…

everyday, and some rare and unusual ones (O’Neil, 2012). Scientists classify the seven different Vertebrates based on their skeletal system, general environmental adaptation, and reproductive systems. These seven Vertebrates include, Agnatha, Chondrichthyes, Osteichthyes, Amphibia, Reptilia, Aves, and Mammalia. During the lab dissection, the class dissected organism from only four of these classes. First, we dissected the perch, which is from the Osteichthyes class. Second, we dissected the pig,…