's environmental biologist Maureen Kearney re-examine the analysis of the fossil skull of a prehistoric fish. The results showed that the fossil jaw of modern vertebrates have "early members" - the thorns Genus - skull fossils. Spines Genera are extinct stickleback classes, their lives age,
hogan, dating back about 290 million years. At present,
mulberry outlet, scientists have found in Europe,
hollister, North America and Australia thorns Is a fossil. Compared with other stickleback Gang,
hollister outlet, thorns Genus is relatively large,
louboutin pas cher, about 30 cm, they are big eyes,
hogan, no teeth, replaced by the shape of the teeth in the gills spines on plankton. Coates and Kearney analyzed thorns Genus skull fossil samples,
mulberry outlet, and with the early sharks and bony fish fossil skull of a comparative study,
hogan outlet, they were surprised to find that all three are very similar in appearance. "This is the first time we look carefully at the thorns Genus skull fossil, which we can study the evolutionary history of vertebrate jaw provides a new perspective." Kearney said, "It is crucial to have jaw spine animals Osteichthyes represents a branch of the human distant ancestors. "It is reported that at present more than 51,
mulberry outlet,000 kinds of vertebrates,
mulberry, there are several species of vertebrate jaw accounted for 99.7%,
mulberry, which represented sharks accounted Chondrichthyes less than 2%,
mulberry, the rest are under Osteichthyes,
hollister, while early gnathostome Osteichthyes differentiation and the origin and early differentiation during vertebrate evolution history occupies a very important position.
Related articles:
Young men of ill blind girlfriend held candlelight wedding _ Man posing as real estate director of the company Woman in hospital after a cold infusion four hours of death _ News
Chat Sentinela
