Write an article on a snake with 4 legs
An article in the 4 November issue of Science gives an opposing view. The visceral organs are elongated, with reduction of the left member in relation to the right; the left lung is greatly reduced or even lost entirely. A Forelimb. When the slab of rock containing the fossil was cracked open, the body of the organism stayed mostly in one half of the slab, whereas the skull was mostly in the other half, paired with a mold or impression of the body.
Four legged snake diet
However, snakes possess increased numbers of vertebrae and have developed two novelties among vertebrates : a tracheal lung in the neck region and a venom -conducting system for subduing prey. The fossil records an animal that was alive at the time of the Flood, possibly thousands of years later than Eden. But there remain some important potential difficulties with the aquatic theory. The exceptional level of preservation of the new fossil also adds weight to the idea that snakes evolved from burrowing lizards. The findings are welcome news to herpetologists, who have long wondered what genetic changes caused snakes to lose their arms and legs, the researchers said. But some researchers think that the fossil is too weird to fit into the snake evolutionary tree. Some have instead argued that snakes evolved from marine lizard ancestors. Interestingly it also has many more vertebrae than is normal for any snake known so far, living or fossil. Yet, the provenance and curation of this most important fossil remains highly problematic. A Forelimb. Tetrapodophis according to Fig. C Hindlimbs and pelvis. However, many of us working in the field are hoping that it will be returned to Brazil in the near future. This ecological plasticity would explain why many early snakes appear to be terrestrial and many others aquatic.
This kinship is supported by aquatic adaptations that we found shared by Tetrapodophis, Pachyrhachis and sea lizards. In either case, the snake is only defending itself.
There are also some other primitive snakes that were unquestionably terrestrial, such as Najash from Argentina, which also still has two little legs.
Snake, lizard or something else? For instance, some researchers suspect it was a marine lizard rather than a terrestrial snake. Perhaps there is a biomechanical reason for this kind of evolution? Tetrapodophis according to Fig.
By Carolyn Gramling Nov.
based on 115 review