{"id":17680,"date":"2020-11-05T09:35:48","date_gmt":"2020-11-05T13:35:48","guid":{"rendered":"https:\/\/www.shortform.com\/blog\/?p=17680"},"modified":"2020-11-23T12:32:47","modified_gmt":"2020-11-23T16:32:47","slug":"tiktaalik-fossil","status":"publish","type":"post","link":"https:\/\/www.shortform.com\/blog\/tiktaalik-fossil\/","title":{"rendered":"The Tiktaalik Fossil: Sharing Traits With Our Ancestors"},"content":{"rendered":"\n

What is the Tiktaalik fossil? Where did it come from and what can it tell us about human life? <\/p>\n\n\n\n

The Tiktaalik fossil is an ancient fossil of the first fish with limbs. The Tiktaalik fish shows traits we currently associate with fish, amphibians, and even humans. <\/p>\n\n\n\n

Read more about the Tiktaalik fossil and what it can tell us about human evolution<\/a>.<\/p>\n\n\n\n\n\n\n\n

Tiktaalik Fossil and Human Origins<\/strong><\/h2>\n\n\n\n

Many features of the human body are just complex versions of those in simpler creatures that, at first glance, seem totally unlike us<\/strong>.<\/p>\n\n\n\n

In Your Inner Fish<\/em>, Neil Shubin, a professor and paleontologist who studies fish fossils, explains that understanding how a shark\u2019s head, a reptile\u2019s brain, and a fish\u2019s fins developed helps make sense of complicated and confounding human anatomy.<\/p>\n\n\n\n

Shubin\u2019s exploration of our primitive connections started in the Canadian Arctic, where he and colleagues discovered a key link in the chain from the earliest creatures to humans: a 375-million-year-old fossil fish, Tiktaalik,<\/em> that had features for living on land.<\/p>\n\n\n\n

Ancient fossils like Tiktaalik, plus embryos and DNA, provide clues to a story of human development stretching back 3.5 billion years. The Tiktaalik fish shows relationships to early life on Earth. <\/p>\n\n\n\n

Finding the Earliest Land Creature <\/strong><\/h3>\n\n\n\n

To understand the origins of land animals and their connection to humans, Shubin set out to find evidence of the first limbed animal, or fish that walked on land. To choose where to look, he applied the three fossil-finding criteria. This lead to the discovery of the Tiktaalik fossil. Here was his criteria:<\/p>\n\n\n\n

1) Rocks the right age<\/strong>: He focused on finding rocks 375 million years old. Researchers had found 365-million-year-old rocks containing amphibian fossils and 385-million-year-old rocks with standard fish, but there was a gap in the fossil record between 365 million and 385 million years. Shubin hypothesized that the missing link was the limbed fish.<\/p>\n\n\n\n

2) Rocks of the right type<\/strong>: Shubin looked for sedimentary rocks because they\u2019re the best type for preserving fossils. These rocks are formed when lakes, rivers, and oceans\u2014habitats in which the first fish with limbs could live\u2014deposit layers of sediment.<\/p>\n\n\n\n

3) Rocks that are exposed<\/strong>: The last step is finding rock of the right age and type that\u2019s also exposed, with little soil, vegetation, or human disturbance. Shubin found conditions meeting these three criteria in the Arctic.<\/p>\n\n\n\n

After four expeditions over six years, Shubin and his team found what they were looking for\u2014a complete fossil skeleton of a transitional creature between fish and land animals. <\/p>\n\n\n\n

Like a fish, it had scales and fins with fin webbing, but like a land animal, it had a flat head with eyes on top and a neck. Also, the fins contained bones corresponding to salamander-type shoulder, elbow, and wrist joints, allowing it to propel itself on land. Researchers called the land-fish Tiktaalik, <\/em>meaning large freshwater fish in the Inuit language. The Tiktaalik fossil remains one of the most important discoveries ever. <\/p>\n\n\n\n

The<\/strong> Tiktaalik<\/em> fish, with its rudimentary joints, including a head free of the shoulder, shares this structure with amphibians, reptiles, birds, mammals\u2014and us<\/strong>.<\/p>\n\n\n\n

It\u2019s as important to our history as the African hominid<\/a> fossil Lucy. Through Lucy, we trace our primate history; the Tiktaalik <\/em>fossil tells us our history as fish. The story of the development of human anatomy through small changes over millennia can be read in fossils, as well as in our genes<\/strong> through DNA\u2014starting with our \u201cinner fish.\u201d The Tiktaalik fossil has been teaching us about our inner fish since its discovery. <\/p>\n","protected":false},"excerpt":{"rendered":"

What is the Tiktaalik fossil? Where did it come from and what can it tell us about human life? The Tiktaalik fossil is an ancient fossil of the first fish with limbs. The Tiktaalik fish shows traits we currently associate with fish, amphibians, and even humans. Read more about the Tiktaalik fossil and what it can tell us about human evolution.<\/p>\n","protected":false},"author":5,"featured_media":17691,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[15,39],"tags":[149],"class_list":["post-17680","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-education","category-history","tag-your-inner-fish","","tg-column-two"],"yoast_head":"\nThe Tiktaalik Fossil: Sharing Traits With Our Ancestors - Shortform Books<\/title>\n<meta name=\"description\" content=\"What is the Tiktaalik fossil? 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