Tiktaalik (/ t ɪ k ˈ t ɑː l ɪ k /; Inuktitut ᑎᒃᑖᓕᒃ) is a monospecific genus of extinct sarcopterygian (lobe-finned fish) from the Late Devonian Period, about 375 Ma (million years ago), having many features akin to those of tetrapods (four-legged animals).. 10. 15. Write. Uriel Sinai/Getty Images News/Getty Images. Kenichthys is a genus of sarcopterygian fish from the Devonian period, and a member of the clade tetrapodomorpha. PLAY. 14. 12. Lungs would have also required the development of a sturdy ribcage, a hallmark of four-limbed animals (also known as tetrapods). Why do many of the transitional fossils between fish and tetrapods have flat heads? amells44. Tiktaalik is also the first known animal to have evolved a neck. Why is a sturdy ribcage important for tetrapods? Tetrapods evolved from a group of animals known as the Tetrapodomorpha which, in turn, evolved from ancient Sarcopterygii (lobe-finned fishes) around 390 million years ago in the middle Devonian period; their forms were transitional between lobe-finned fishes and the four-limbed tetrapods. Why is Tiktaalik such an important transitional fossil? Digits. Explain the importance of a sturdy ribcage in tetrapods. Do any modern tetrapods have gills? 9. Why are lobe-finned fish thought to be the closest relatives to tetrapods? The vertebrae you are probably most familiar with (like our own!) Why do many of the transitional fossils between fish and tetrapods have flat heads? What evolutionary advancements needed to evolve for vertebrates to adapt to land? Later tetrapods evolved necks with seven or more vertebrae, some long and some short, permitting even more mobility. To what are fins homologous? Vert 2. Transition to Land. Why are lobe-finned fish thought to be the closest relatives to tetrapods? 17. Scientific theories are powerful because they allow us to make predictions about our world. 13. consist of a spool-like centrum, which connects in front and back with other centra. The Ribcage . (Origin of tetrapods Click and learn – choose three points are say what changed and why it was needed). Created by. STUDY. 12. Sturdy Ribcage – Fish have thin rib bones. 13. 18. To what are fins homologous? Tetrapod, (superclass Tetrapoda), a superclass of animals that includes all limbed vertebrates (backboned animals) constituting the classes Amphibia (amphibians), Reptilia (reptiles), Aves (birds), Mammalia (mammals), and their direct ancestors that emerged roughly 397 million years ago during the 10.Feet in tetrapods 11.Explain the importance of a sturdy ribcage in tetrapods. We look at all the evidence we have gathered to date and predict what we might find if we do certain experiments. Explain. By Shorey Andrews . Gravity. Why did this adaptation evolve? Why did lungs develop in fish, leading to tetrapods? What is homology? Learn. Tetrapods use _____ to breathe. Terms in this set (52) Compared to the densisty of water, what is the density of a vertebrates body- ... What did tetrapods loose inorder to have a … Tetrapods, which are four-limbed vertebrates ('tetra' means 'four'), evolved from those lobe-finned fishes and over time made their way onto land. 11. Once we have researched all the fossils relevant to the water-to-land transition, we begin to get an idea of what timeframe this transition happened in. The first tetrapods appear around 363 million years ago. What do we mean in biology when we use the term homology? 16. Having the head and the shoulders separate would become a very important feature of the first exclusively land-based tetrapods. The only known species of the genus is Kenichthys campbelli (named for the Australian palaeontologist Ken Campbell), the first remains of which were found in China in 1993. The search for Tiktaalik put our scientific theory to the test. What is homology? 13. Match. Aug. 17, 2014. Most modern tetrapods have _____ digits on front limbs and _____ digits on back limbs, although some species have fewer.