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Author Topic:   Evolving the Musculoskeletal System
arachnophilia
Member (Idle past 1452 days)
Posts: 9069
From: god's waiting room
Joined: 05-21-2004


Message 506 of 527 (600049)
01-12-2011 2:23 AM
Reply to: Message 505 by crashfrog
01-11-2011 8:55 PM


living transitional skeletons
crashfrog writes:
We don't see those hard spots in living creatures now because that evolution already happened. Organisms already have skeletons. Why would they evolve again?
eek, that's a clearly false notion of evolution. evolution is not directed, nor does it forbid convergence, nor does it necessitate that once an adaptation is successful that it be adopted across lineages -- no, it actually predicts that won't happen. that would be a good sign of intelligent design.
in any case, here are some living animals with various states of "hard spots" on the way to having a bony skeleton.

amphioxus, somewhat basal chordate. spinal column, somewhat rigid.

lamprey, jawless fish. cartilaginous skeleton, no bones.

shark, jawed fish. bony jaw, cartilaginous skeleton.
these are, of course, somewhat representative of the fossil record.

אָרַח

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 Message 505 by crashfrog, posted 01-11-2011 8:55 PM crashfrog has replied

Replies to this message:
 Message 516 by crashfrog, posted 01-13-2011 2:07 PM arachnophilia has replied
 Message 520 by Dr Adequate, posted 01-13-2011 11:45 PM arachnophilia has not replied

  
arachnophilia
Member (Idle past 1452 days)
Posts: 9069
From: god's waiting room
Joined: 05-21-2004


Message 518 of 527 (600273)
01-13-2011 5:35 PM
Reply to: Message 516 by crashfrog
01-13-2011 2:07 PM


Re: living transitional skeletons
crash,
oh. i see. i was having some difficulty making sense of what the heck he even meant.

This message is a reply to:
 Message 516 by crashfrog, posted 01-13-2011 2:07 PM crashfrog has replied

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arachnophilia
Member (Idle past 1452 days)
Posts: 9069
From: god's waiting room
Joined: 05-21-2004


Message 527 of 527 (601331)
01-19-2011 9:42 PM
Reply to: Message 526 by Dr Adequate
01-14-2011 8:27 AM


Re: living transitional skeletons
i'm actually unsure, here.
in any case, i was merely trying to demonstrate some living animals that represent various states of bone/not-bone, not necessarily an actual lineage (which modern sharks, a crown group, would certainly not technically be a part of).
in any case, that was not what ICdesign (proponentsists) meant.

אָרַח

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 Message 526 by Dr Adequate, posted 01-14-2011 8:27 AM Dr Adequate has not replied

  
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