They are: Mammalia, Reptilia, Aves, Osteichthyes, Chrondrichthyes, Agnatha, Amphibia. They are the main 7, but there should actually be more go to: http://en.wikipedia.org/wiki/List_of_chordate_orders for more details.
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The five classes of chordates are mammals, birds, reptiles, amphibians, and fish. Each class is characterized by specific traits, such as body coverings, reproduction methods, and habitat preferences.
There are not five classes, but eight. They are Agnatha (no jaw), Chondrichtyes, (Cartilage fish), Osteichtyes (bone fish), Amphibia (two lives), Reptilia, (creeping), Aves (bird), Mammalia (teets, nipples), and placoderm (plate skin).
Modern Cnidarians are usually classified into one of these four classes; Hydrozoa, Scyphozoa, Cubozoa and Anthozoa.
There are more classes of Cnidarians (a total of 9), but they may not be as commonly used in classification anymore; Polypodiozoa, Staurozoa, Malacosporea, Myxosporea and Polypodiozoa.
Chordates are a group of animals which include vertebrates (animals having a spinal column), so yes, birds are chordates.
Lancelets are considered true chordates because they possess a notochord, dorsal nerve cord, pharyngeal slits, and a post-anal tail at some stage in their life cycle, which are characteristic features of chordates. They are believed to represent an early evolutionary stage of the chordates.
Chordates are a diverse group of animals that includes humans, and they are not inherently harmful. While some species of chordates may pose a threat due to factors like venom or aggression, the majority of chordates play important roles in ecosystems and are not harmful to humans.
Lower chordates refer to a group of simple, marine invertebrate animals that belong to the phylum Chordata but do not possess a backbone or vertebral column. Examples of lower chordates include tunicates, lancelets, and hagfish. They are considered primitive chordates with some characteristics of vertebrates.
Not necessarily. While some chordates, like humans and other mammals, have relatively large brains compared to their body size, not all chordates have large brains. Chordates range in complexity from simple organisms like tunicates to more advanced vertebrates like birds and primates.