GLY-1102 Lecture Notes - Lecture 14: Coelacanth, Hydroxylapatite, Inbetweening
17 Sep 2018
School
Department
Course
Professor
Document Summary
Jaws may have been adapted to obtain oxygen. Sound transduction hearing is all based on bone. Dna is phosphorous, thus bone is partly phosphorous. Limit of phosphorous limits growth of life, bone stores phosphorous for later use. Muscles attach to fins instead of just spiny outputs. Has a lung, but uses it for fat storage rather than breathing. Thought t cross over land just to find more water, not necessarily to live on land. Due to muscles with fins, able to crawl around. Over time could have evolved into amphibious legs. Devonian is known as age of fish, amphibians age would be late carboniferous. Has shoulders/hip girdles, legs like tetrapod with homologous bones. In fish, it is a simple bone outside the fish, possibly a gill arch support, nerves able to sense vibrations. Bone moves in, tympanic membrane covers it and catches sound. All this moves in and gets more complicated.
