쉐도잉 연습: How turtle shells evolved... twice - Judy Cebra Thomas - YouTube로 영어 말하기 배우기

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Meet Odontochelys semitestacea.
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Meet Odontochelys semitestacea.
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This little creature spends its days splashing in Late Triassic swamps with a host of other reptiles.
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Under the surface lies its best defense against attack: a hard shell on its belly.
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Odontochelys is an early ancestor of the turtle.
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Its half-shelled body illustrates an important point about the modern turtle: it actually has two shells that develop totally separately while the turtle is still an embryo.
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Both are extensions of the animal’s skeleton, and together they are made of almost 60 bones.
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Like other embryos, turtle embryos are made of undifferentiated cells that become specific cell types, and then organs and tissues, through gene activity and communication between cells.
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At first, turtle embryos look very similar to those of other reptiles, birds, and mammals, except for a bulge of cells called the carapacial ridge.
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The ridge expands around the body between the neck and lower back, creating a disc shape.
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It guides the formation of the upper part of the turtle’s shell, called the carapace, likely by attracting the cells that will become ribs.
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Instead of curving downwards to make a regular rib cage, the ribs move outwards towards the carapacial ridge.
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They then secrete a signaling protein that converts surrounding cells into bone-forming cells.
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These fifty bones grow until they meet and connect with sutures.
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A ring of bone solidifies the carapace’s edges.
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The outer layer of skin cells produces the scales, known as scutes, that cover the carapace.
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The development of the bottom half of the shell, the plastron, is driven by neural crest cells, which can produce a variety of different cell types including neurons, cartilage and bone.
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A thick shield of these cells spreads across the belly, coming together in regions that produce nine plate-like bones.
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Eventually, these connect to the carapace by sutures.
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A turtle’s shell has obvious advantages for guarding against predators, but the rigid casing also presents some challenges.
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As the turtle grows, the sutures between the bones of the carapace and plastron spread.
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Most mammals and reptiles rely on a flexible rib cage that expands to allow them to breathe, but turtles use abdominal muscles attached to the shell instead: one to breathe in, and one to breathe out.
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So how did the shell evolve?
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Though there are still gaps in the fossil record, the first step seems to have been a thickening of the ribs.
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The oldest known turtle ancestor, a creature called Eunotosaurus africanus, lived 260 million years ago and looked almost nothing like a modern turtle, but it had a set of broad, flat ribs that anchored the muscles of its powerful forearms.
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Eunotosaurus was likely a burrowing creature, digging homes for itself in what’s now southern Africa.
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Odontochelys semitestacea illustrates another, later step in turtle evolution, with thick ribs like Eunotosaurus plus a belly plate for protection.
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Our first fossil evidence of the full shell characteristic of modern turtles is about 210 million years old, and belongs to a species called Proganochelys quenstedti, whose ribs had fused.
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Proganochelys could move between water and land.
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Unlike modern turtles, it couldn’t retract its head into its shell, but had defensive spines on its neck.
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Modern turtle shells are almost as diverse as the turtles themselves.
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Sea turtles have flatter, lighter shells for streamlined gliding through the water.
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Land-dwelling tortoises, meanwhile, have domed shells that can slip free of predators’ jaws and help them turn right-side up if they fall on their backs.
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Leatherback and softshell turtles have shells without the ring of bone around the edge of the carapace or the tough scutes covering it, making it easier for them to squeeze into tight spaces.

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주요 어휘 및 구절

  • Odontochelys semitestacea (오돈토켈리스 세미테스타체아)
  • carapacial ridge (갑각 능선)
  • carapace (갑각)
  • plastron (배갑)
  • neural crest cells (신경 능선 세포)
  • dome-shaped shells (돔 형태의 갑옷)
  • fossil record (화석 기록)
  • defensive spines (방어용 가시)

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이 영상에서는 다양한 과학적인 개념과 전문 용어를 사용하고 있어 이해하기 쉽지 않을 수 있습니다. 따라서 처음에는 속도를 느리게 조절하고, 반복적으로 시청하여 각각의 문장을 따라 읽는 것이 좋습니다. 영어 쉐도잉 기법을 활용하여, 발음을 교정하고 자연스러운 억양을 익히세요. 영상의 속도에 맞춰 성우의 발음을 따라 해보면 도움이 됩니다. shadow speech 기술을 사용하여, 문장을 완벽하게 톤과 리듬에 맞추어 연습해 보세요. 과거 설명된 생물학적 개념들을 통한 더 깊은 이해를 바탕으로, 각 어휘와 구절을 자연스럽게 출력할 수 있는 능력을 기르세요.

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