The lateral motion data suggests that mako sharks are kinematically closer to tuna than other sharks. As supported by sonomicrometry recordings, during active swimming mako sharks detach their red muscles from the neighbouring tissues and focus their motion towards the posterior region of their body. Such mechanism has been found to be reciprocal in tunas, which recruit their deep red muscles in a similar fashion to power their caudal region. Nonetheless, mako sharks rely on their hypaxial lateral tendon for producing such movement, while in tuna the tendons that perform this task are found in the horizontal septum. Thus the researchers conclude that the locomotion systems of lamnid sharks and tunas arose independently by convergent evolution.
Comments
PP response thanksgiving
Very well written and informative, the argument is laid out, worked through and then concluded in the most efficient manner possible. This paragraph sounds perfectly written for the Academic criteria of evolution.
terminology
Very well written and very informative. However, your terminolgoy is a bit confusing. You say that the mako is very similar in its locomotive muscle distribution to tuna in that it exerts more energy to posterior muscles. You go on to say the tuna is more caudally locoalized muscle movement. I understand caudal to be in the tail region and posterior to be "in back or behind of". If you are comparing the two, it would be beneficial to use similar terminology in order to avoid confusion.
Lots of information! I think
Lots of information! I think it would be better to organize the paragraph slightly more different, as well as use more common terminology.