Earth Sciences 2266F/G Lecture Notes - Lecture 10: Osteolepiformes, Sarcopterygii, Shoulder Girdle
26 Jul 2016
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Very diverse; can adapt to salt water, fresh water, shallow water, deeper water, and even under. Actinopterygii are the ray-finned fish the ones we eat. Sarcopterygii are lobe-finned; they have a big lobe and have a lot of meat on them, along with strong bones inside of them. These eventually evolved into amphibians and reptiles, and then to us. Within this group, some of them have lungs. Both these groups started in the late silurian, but radiated in the devonian. Sarcopterygians evolved to be quite big and were the top predators. Coelacanths hide in deeper waters and people thought they were extinct before. Osteolepiformes are represented by only fossils, no living species today. Very strong lobes can allow them to crawl out of water. Some people think lungfish are most related to us, some think it"s lobe-finned, some think it"s ray; we are still not entirely sure. We think that osteolepiformes are most closely related to land-dwelling animals.
