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EvC Forum ⇒ Science Forums ⇒ Biological Evolution ⇒

Plausible Evolutionary Chains for Educational Use

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Author Topic:   Plausible Evolutionary Chains for Educational Use
arachnophilia
Member (Idle past 1373 days)
Posts: 9069
From: god's waiting room
Joined: 05-21-2004

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Message 12 of 25 (377812)
01-18-2007 1:22 PM 		Reply to: Message 7 by mick
01-12-2007 6:57 AM

Re: First Chain - Forams and Transitions
Unfortunately the pictures are a bit blocky and the species aren't named - but it might be possible for somebody who knows about dinosaurs to label some of the species.
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genera, anyways. it's really hard to tell what they are from the size of the diagram. the dinosaur below archie is maniraptor of some kind (dromaeosauridae, i would guess), and below him appears to be an oviraptor.
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in any case, it's not exactly correct. oviraptors have pygostyles and beaks. the bottom should be a crocodilian from the paleozoic, not a modern croc. (i would have started wirh euparkaria, or something that ends in -suchus)
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Edited by arachnophilia, : No reason given.
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arachnophilia
Member (Idle past 1373 days)
Posts: 9069
From: god's waiting room
Joined: 05-21-2004

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Message 14 of 25 (377817)
01-18-2007 1:31 PM 		Reply to: Message 11 by Equinox
01-18-2007 12:19 PM

Re: Fourth Chain - Horses, Feet to Hooves
The trilobite chain could be useful if we took drawings from, say, a vendian precursor to a trilobite and had drawings showing it morphing into a horseshoe crab,
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horseshoe crabs are not related to trilobites in that way.
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trilobitomorpha and chelicerata (spiders and horseshoe crabs) are separate subphyla of arthropoda.
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arachnophilia
Member (Idle past 1373 days)
Posts: 9069
From: god's waiting room
Joined: 05-21-2004

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Message 17 of 25 (378150)
01-19-2007 6:37 PM 		Reply to: Message 16 by RAZD
01-19-2007 6:25 PM

Re: Trilobites to Spiders
spiders and trilobites share a common ancestor -- something like a neotonous trilobite. looks like the larval form. you won't see a transition from trilobites to spiders and more than you will see one from dogs to cats.
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i'm not actually very clear on arthropod evolution. i can point lith in this way, he'll explain to you why the initial request is silly.
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