Taxonomic groups of fish and examples include: Primitive jawless fish:lampreys, hagfishes Cartilaginous fish:sharks, rays, skates Bony fish:tuna, seahorses, guppies Some subtypes like herring occupy huge biomass in wild food chains while others like seahorses fill narrow niches. ...
That said, they are not closely related to eels — and have loose-fitting, slimy skin, the ability to breathe through their nose and skin, and jawless mouths.RaysRays are cartilaginous fish that belong to the order Batoidea. There are over 600 species of rays, and they are characterized ...
Eurypterids, or water scorpions, and jawless fish spread into brackish and fresh water for the first time. Snails andnautiloidswere common organisms. Near the end of the Silurian period, there were some minor extinction events, including the Lau event, caused by either impact events orclimate ...
I think one of the most interesting things I have come across is learning that there are actually very few vertebrates in the world, considering the number of invertebrates that exist. If you consider all of the named animal species of the world, only 1% is estimated to actually be vertebrat...
Michael Anissimov is a dedicated WiseGeek contributor and brings his expertise in paleontology, physics, biology, astronomy, chemistry, and futurism to his articles. An avid blogger, Michael is deeply passionate about stem cell research, regenerative medicine, and life extension therapies. His professi...
Deuterostomes are a superphylum of animals that includes vertebrates and echinoderms, among other things. All deuterostomes start...