The Evolution of Classification

File this under, “Just Cool Science”.

From Not Exactly Rocket Science:

Whalefishes, bignoses and tapetails – these three groups of deep-sea fishes couldn’t look more different. The whalefishes (Cetomimidae) have whale-shaped bodies with disproportionately large mouths, tiny eyes, no scales and furrowed lateral lines – narrow organs on a fish’s flanks that allow it to sense water pressure.

The tapetails (Mirapinnidae) are very different – they also lack scales but they have no lateral lines. They have sharply angled mouths that give them a comical overbite and long tail streamers that extend to nine times the length of their bodies.

The bignoses (Megalommycteridae) are very different still – unlike the other two groups, they have scales, their mouths are small and their noses (as their name suggests) are very large.

Based on these distinct bodies, scientists have classified these fishes into three distinct families. Now, it seems they are wrong. Amazingly enough, the three groups are all just one single family – the tapetails are the larvae, the bignoses are the males and the whalefishes are the females. The entire classification scheme for these fishes needs to be reworked, as many distinct “species” are actually different sexes or life-stages of the same animal.

Biology rocks.

I’ve mentioned before that we live on a planet that is 70% water by area. Doc pointed out that it’s about 99% of the biosphere by volume and we’ve explored about 5% of that. That’s a lot of planet we humans have never even visited. I expect there’s plenty more weirdness to be discovered at the bottom of the ocean.

It is an amazing, wonderful, and surprising world we live in, and Ed’s got the pictures to prove it.

h/t Greg Laden

2 Responses to “The Evolution of Classification”

  1. Kym Says:

    I don’t know which I enjoyed more the new piece of info about the fish (I love that they pulled one over on us so to speak) or your enthusiasm—When you tell it, biology does rock!

  2. Lou FCD Says:

    Oh, biology rocks just fine without lil’ ol’ me, but thanks, Kym.


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