Vertebrates
Two big groups of vertebrates are based on this
Jaws or no jaws
The most famous Cambrian explosion site is here
British Columbia, Canada. The Burgess Shale
These structures were made of thin mats of algae, and secrete hard layers of mineralized rock in layers.
Stromatolites
The bowfin are bony fish, also called
Osteichthyes
Do bluegill belong to Agnatha or Gnathostomata?
Gnathostomata (have jaws)
Humans evolved from these, who were also the ancestors of the dinosaurs, birds, reptiles and amphibians
Tetrapods
This is the main thing that happened during the Cambrian explosion
Rapid appearance of many different groups of invertebrate animals
What did stromatolites do for the early atmosphere?
They built up oxygen for millions of years.
Within the bony fishes, bowfin have lobe shaped fins, meaning they are what group?
Sarcopterygii
Are bluegill chondrichthyes or osteichthyes?
Osteichthyes (have bones, not cartilage)
This group does not have jaws
Agnatha
This is how the Cambrian explosion ended
Massive extinction event, probably caused by Oxygen deprivation or glaciation--- And some scientists argue it never really happened at all.
One of the earliest known animals was called
Charnia
Like mammals, bowfin have
Lungs
Are bluegill sarcopterygii, or are they actinopterygii?
Actinopterygii
This group does have jaws
Gnathostomata
The fossils from the Cambrian were exceptional because most of the species had this kind of body
Soft body
These were the causes of some extinction events throughout history
Volcanoes, Meteorites, Ice Ages
During early stages of their development, larval bowfin very closely resemble placodonts, which were
Ancient fish from the devonian, they got about 20 feet long and have ginat blade like beak like a parrot.
True or false; Bluegills descended from tetrapods
No, they are a completely different group= Pisces
These were the first animals to venture up onto land
Tetrapods
This is about when the Cambrian explosion began to occur
540 million years ago.
Most trilobites went extinct at the end of this time period
Cambrian explosion
Bowfin are relict species meaning
They are one of the last or the last species from an ancient group that has almost all gone completely extinct
One of the distinguishing characteristics that makes bluegill actinopterygii instead of sarcopterygii are their
Fins