| 单词 | gill arch |
| 例句 | Mr. Shubin reveals what happens to the gill arches evident in human embryos, why some gonads travel and others do not, and how a gene called “sonic hedgehog” determines the shape of fingers and fins. | Television: The Journey to Humanity 2014-04-04T20:21:24Z They found the unusual head-shoulder joint bears similarities with the gill arches in earlier fish, suggesting it was these that were retained and incorporated into the formation of the shoulder at an early stage. How the fish got its shoulder 2023-11-01T04:00:00Z About 500 million years ago, vertebrates were jawless marine creatures with tails but no paired fins, and numerous, paired gill arches. Where did shoulders come from? Ancient fish reveal joint’s evolution 2023-11-01T04:00:00Z The major evolutionary event was the development of the forward pair of gill arches into jaws, allowing fish new feeding strategies and opening up new ecological niches. An Introduction to Geology 2017-01-01T00:00:00Z It is not the oldest shark fossil, but it is the oldest to reveal all of the anatomy of the skeleton supporting the gill arches, a vitally important element of a fish. Jaws, the prequel: Scientists find the 'Model T Ford' of sharks 2014-04-16T21:55:07Z These gill arches were arranged in a serial way, more like those of bony fish than modern sharks. Modern Sharks May Not Be "Living Fossils" After All 2014-04-16T22:00:00Z While most jawless fish have 5-20 gill arches, jawed fish almost never have more than five. How the fish got its shoulder 2023-11-01T04:00:00Z Ichthyologists have long argued that jaws arose from an ancestor’s most forward gill arch. Where did shoulders come from? Ancient fish reveal joint’s evolution 2023-11-01T04:00:00Z The vertebrate shoulder, they conclude, arose in part from ancestral fishes’ gill arches, curved supports encircling the throat. Where did shoulders come from? Ancient fish reveal joint’s evolution 2023-11-01T04:00:00Z Another gill arch eventually evolved into a head bone called the hyoid. Where did shoulders come from? Ancient fish reveal joint’s evolution 2023-11-01T04:00:00Z The X-ray scans revealed the fossil had complete gill arches, the support structures for the gills that fish use to breathe. Modern Sharks May Not Be "Living Fossils" After All 2014-04-16T22:00:00Z Combining this with the new brain-case evidence, the team suggest the sixth gill arch was incorporated into the shoulder, becoming a crucial boundary that separated the head from the body. How the fish got its shoulder 2023-11-01T04:00:00Z He wondered whether that cartilage had once been connected to a gill arch. Where did shoulders come from? Ancient fish reveal joint’s evolution 2023-11-01T04:00:00Z In the 1800s, biologists suggested the pectoral girdle—which eventually gave rise to the human shoulder—came from other gill arches. Where did shoulders come from? Ancient fish reveal joint’s evolution 2023-11-01T04:00:00Z Known placoderms have at most five gill arches, others having evolved into jaws and the hyoid, so the pectoral girdle derives from what was once the sixth gill arch, Brazeau’s team concludes. Where did shoulders come from? Ancient fish reveal joint’s evolution 2023-11-01T04:00:00Z The divot, or the area that was once the sixth gill arch, is an anatomical landmark, dividing head from trunk tissue, Brazeau and his colleagues say. Where did shoulders come from? Ancient fish reveal joint’s evolution 2023-11-01T04:00:00Z Intriguingly, the blood supply to the fins of jawless fishes emerges between the sixth and seventh gill arches. How the fish got its shoulder 2023-11-01T04:00:00Z But he cautions that because “the gill arches aren’t known in any of these fossils, it’s all hypothetical.” Where did shoulders come from? Ancient fish reveal joint’s evolution 2023-11-01T04:00:00Z These fish lack a distinctive head and shoulder, but fossil evidence of blood vessels shows the circulatory system to the head and to the trunk divides after the sixth gill arch. Where did shoulders come from? Ancient fish reveal joint’s evolution 2023-11-01T04:00:00Z |
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