CHM120H5 Lecture Notes - Lecture 14: Gnathostomata, Pharyngeal Slit, Paedophryne
Document Summary
Vertebrates may not be numerous-invertebrates are more numerous. They are disparate, however there are heaviest, biggest, or smallest blue whale is the largest. Cephalochordates, urochordates, vertebrates all have notochord, dorsal hollow nerve chord, tail extension, pharyngeal slit or pharynx. Urochordata tunicate are colonial or individual chordate characterisics only present in the larval form. They are similar t other chordates due to the characterisics they had in embryonic form and embryonic form is their only mobile form. Animals with head means there must be bone or bilaterally symmetrical we also need less nerve issue in the body as compared to the skull as it holds all the sensory organs. Fossil evidence is highly detailed and clear allows us to difereniate and idenify them. Lanclelets cephalochordates structured gill pouches shit form sessile to mobile lifestyles gill pouch structure indicates the acive oxygen uptake so othey needed to move around.
