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:iconspeculativeevolution: #SpeculativeEvolution

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May 26, 2011
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:iconnocturnalsea:
In addition to young V. lucifer (b), several other organisms frequently take up residence in the Glowworm Nautilus'[link] brood chamber. Copepods (A.), Ostracods (E.) and pelagic trilobites (D.) are abundant, as are planktonic crustacean larvae such as this crab zoea (C.). The identity of (F.) remained a mystery for quite some time. Clearly it was some sort of larvae, but we couldn't identify the adult form until Dr. Alonso successfully managed to raise a few to adulthood in his lab tanks. It turns out this spiny critter is actually the young of the anomalocarid Schinderhannes bartelsi.
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:iconindigomagpie:
~indigomagpie Jul 20, 2011
Are there pelagic trilobites in the fossil record?
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:iconnocturnalsea:
~NocturnalSea Jul 20, 2011  Professional Traditional Artist
Many, actually. Carolinites, Telephinus and Opipeuterella, for example. Their streamlined bodies and large eyes indicate a pelagic life, as do their global distributions in the fossil record (since bottom-dwelling trilboties wouldn't be able to migrate across the vast gulfs of the abyss to reach other shores). Sam Gon talks about it on his site:[link]
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:iconamnioticoef:
~AmnioticOef May 26, 2011
Nice one on F ! At first I thought it was a little Hallucinigenia (or whatever it's called :P ).
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:iconnocturnalsea:
~NocturnalSea May 26, 2011  Professional Traditional Artist
I've often wondered what the larval forms of many prehistoric invertebrates would look like. The problem with trying to speculate is that larvae usually look nothig like the adult form.
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:iconamnioticoef:
~AmnioticOef May 26, 2011
Could it be that distinct larval forms hadn't evolved by that point?

Or is that naive? :D
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:iconnocturnalsea:
~NocturnalSea May 27, 2011  Professional Traditional Artist
If anything, I'd bet that the larval forms came first. I'd imagine that arthropods probably first differentiated as tiny planktonic creatures during the Precambrian (which would explain why we haven't found their fossils), and didn't actually gain hard, relatively large bodies until the Cambrian. That would explain the seeming "Cambrian Explosion" of diversity.
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:iconamnioticoef:
~AmnioticOef May 27, 2011
Wow, that actually sounds pretty plausible! Is that a mainstream hypothesis or did you think of it yourself?
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:iconnocturnalsea:
~NocturnalSea May 27, 2011  Professional Traditional Artist
I'm pretty sure I didn't come up with it. I feel like I read that somewhere, but I can't remember where. At least, I doubt I'm the first person to think of it.
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:iconamnioticoef:
~AmnioticOef May 27, 2011
Oy, not remembering sources is a pain. I've never heard of that idea though, so it could be original.
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