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Posted by: CKing at Sun Nov 16 10:09:17 2003 [ Email Message ] [ Show All Posts by CKing ] If similarities in chemical structure is irrefutable proof of homology, then tetrodotoxin must have evolved in the common ancestor of the puffer fishes and the blue ringed octupus and it has subsequently been lost in other kinds of fishes and in other kinds of octopuses. Clearly this is not the case since tetrodotoxin is of bacterial origin. Since an estimated 60-70% of colubrids, according to Dr. Kenneth Kardong, lack the Duvernoy's gland and they therefore lack toxins, the venom evolved first in the colubroid ancestor hypothesis is just as untenable as the monophyletic origin of tetrodotoxin. | ||
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