ichthyostega वाक्य
उदाहरण वाक्य
मोबाइल
- The fossil record is silent about the 20 million years immediately following Ichthyostega.
- Whether these traits were independently evolved in " Ichthyostega " is debated.
- This projection is also seen in the Late Devonian tetrapod " Ichthyostega ".
- Comparisons between the skeletal features of Acanthostega and Ichthyostega reveal that they had different habits.
- His research on the Devonian tetrapod " Ichthyostega " was continued by Erik Jarvik.
- The oldest near-complete tetrapod fossils, Acanthostega and Ichthyostega, date from the second half of the Fammennian.
- In panderichthyids and " Ichthyostega " ribs are attached to the neural arch and there is an intercentrum.
- Ichthyostega means " fish plate " because the roof of its skull was shaped like that of a fish.
- A 2012 study using 3D reconstructions of " Ichthyostega " concluded that it was incapable of typical quadrupedal gaits.
- The most complete skeletal material of an early amphibian tetrapod is the Ichthyostega, found in Greenland and dated 362 million years old.
- This suggests tetrapod evolution is older than the dated fossils of " Panderichthys " through to " Ichthyostega ".
- Trackway impressions made by something that resembles " Ichthyostega "'s limbs were formed 390 Ma in Polish marine tidal sediments.
- These events of extinctions led to the disappearance of primitive tetrapods with fish-like features like Ichthyostega and their primary more aquatic relatives.
- Ichthyostega, on the other hand, is considered to be a fully terrestrial tetrapod that perhaps depended on water for its aquatic young.
- Acanthostega is likely exclusive to an aquatic environment, while Ichthyostega is progressed in the aquatic to terrestrial transition by living dominantly on the shores.
- But the discoveries of " Acanthostega " and " Ichthyostega " confirm that the pentyldactyl ancestor came later in the development of tetrapods.
- Tiktaalik also had a pattern of bones in the skull roof ( upper half of the skull ) that bears similarity to the end-Devonian tetrapod Ichthyostega.
- He brought back fossils of " Ichthyostega, " by then the earliest known tetrapod, and published an extensive preliminary report on it in 1932.
- The feet are only known from " Ichthyostega ", Acanthostega, and Tulerpeton, but appear to be fin rays like those found in fish.
- For most of this century, in fact, only one primitive specimen was known in any detail : a bulky, dog-size beast from Greenland named Ichthyostega.
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