ichthyostega वाक्य
उदाहरण वाक्य
मोबाइल
- Finally, Jarvik investigated the anatomy of " Ichthyostega ", resulting in a monograph with an extensive photographic documentation of the material collected in 1929-1955.
- Swedish paleontologist Erik Jarvik, a member of the 1947 expedition, could not assign the skull to either " Ichthyostega " or " Acanthostega ".
- While the skull shape is closest to " Ichthyostega ", the teeth are smaller, more numerous and less curved, indicating the two exploited different foods.
- Although both were essentially four-footed fish, Ichthyostega is the earliest known tetrapod that may have had the ability to pull itself onto land and drag itself forward with its forelimbs.
- Tetrapodomorphs used their bodies and tails for locomotion and their fins for steering and braking; " Ichthyostega " may have used its forelimbs for locomotion on land and its tail for swimming.
- In the " Acanthostega " and " Ichthyostega ", which are considered to be more derived than other basal aquatic tetrapods, the pectoral girdle is decoupled from the skull.
- It does however show that " Ichthyostega " may have ventured onto land on occasions, unlike the very first tetrapods such as " Elginerpeton " and " Obruchevichthys ".
- Various foramina on the humeral surfaces are very similar to those seen in " Ichthyostega ", " Acanthostega ", and lobe-finned fishes like " Eusthenopteron ".
- Early tetrapods like " Ichthyostega " and " Acanthostega " differed from earlier tetrapodomorphs such as " Eusthenopteron " or " Panderichthys " in their increased adaptations for life on land.
- He has also analysed the basic structure of the paired limbs by comparing the pectoral and pelvic fins of the " Eusthenopteron " with the hindleg of the Devonian tetrapod " Ichthyostega " and embryonic humans.
- However, even the early Ichthyostegalians like " Acanthostega " and " Ichthyostega " appear to have had the forward ossified bony toes combined in a single stout digit, making them effectively five-toed.
- Like those of the Late Devonian " Panderichthys " and " Ichthyostega ", the glenoid of " Tinirau " is elongated along the anteroposterior ( forward-backward ) axis of the body.
- At the gain of the game, each player starts with one population of a species of prehistoric amphibian e . g . " Ichthyostega ", " Tulerpeton ", and " Acanthostega ".
- In conjunction with robust forelimbs and shoulder girdle, both Tiktaalik and Ichthyostega may have had the ability to locomote on land in the manner of a seal, with the forward portion of the torso elevated, the hind part dragging behind.
- Until finds of other early tetrapods and closely related fishes in the late 20th century, " Ichthyostega " stood alone as the transitional fossil between fish and tetrapods, combining a fishlike tail and gills with an amphibian skull and limbs.
- Although it appears to have spent its whole life in water, its humerus also exhibits traits that resemble those of later, fully terrestrial stem-tetrapods ( the humerus in " Ichthyostega " is more similar to earlier fishes ).
- It shares a similar pattern of skull roofing bones with forms such as " Ichthyostega " and " Acanthostega " . " Eusthenopteron ", like other enamel, which characterizes all of the earliest known tetrapods as well.
- In 1987, during an expedition to East Greenland, Clack and her team discovered the remains of the Devonian tetrapods " Acanthostega " and " Ichthyostega " . " Acanthostega " is a transitional, water-bound primitive tetrapod.
- Being one of the first animals with legs, arms, and finger bones, " Ichthyostega " is seen as a hybrid between a fish and an amphibian . " Ichthyostega " had legs but its limbs probably were not used for walking.
- Being one of the first animals with legs, arms, and finger bones, " Ichthyostega " is seen as a hybrid between a fish and an amphibian . " Ichthyostega " had legs but its limbs probably were not used for walking.
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