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| Pladcoderm evolution; Remember the armored fish? | |
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| Topic Started: Sep 11 2008, 08:37 AM (3,175 Views) | |
| Spartan Delta | Sep 11 2008, 08:37 AM Post #1 |
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Infant
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I had a thought. Does anybody remember the pladcoderm fish from the Devonian, like Dunkleosteus? Well, what if they were able to get on land first? I imagined a T-Rex like biped with fins for this... What do you think? |
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| colddigger | May 8 2009, 09:41 PM Post #46 |
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Joke's over! Love, Parasky
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I don't see why this line has to follow in our foot steps to become land dwellers... That's like if we were in a world in which arthropods never made it to land and people go off and say they couldn't possibly do it because they have exoskeletons, no float bladder, and too many(or too fragile) legs. If a fishthing was to go onto land, and it lacked an organ that our ancestors just so happened to have evolved into lungs, then it could just develop something else for the job. If it lacked limbs for supporting its body(amphibians barely even lift their bodies when moving btw so carrying your weight on your limbs even if you had them is quite unnecessary) then it can just move like a snake. Edited by colddigger, May 8 2009, 09:44 PM.
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Oh Fine. Oh hi you! Why don't you go check out the finery that is SGP?? v Don't click v Spoiler: click to toggle | |
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| ATEK Azul | May 9 2009, 02:08 PM Post #47 |
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Transhuman
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i would think these animals would have at first a medusa like body structure(at least at some point) and then eventualy becoming bipedal as there tail shrinks becouse i see these as having 2 limbs and relying on the tail alot or at least at first. as for the dinosaurs evolving from placoderms i would say that all of this lineage would evolve from animals with erect stances that draged them selves for more speed while slithering then as the dragging becomes less advantagous its group would evolve smaller tails and better leg muscles so that they become bipedal. then they could get bigger and eventually they might evolve out of their armor super thin spikes that keep growing and these develope into proto featherish bone coverings? |
| I am dyslexic, please ignore the typo's! | |
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| Spartan Delta | May 18 2009, 12:03 PM Post #48 |
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Ok, first off, I just wanted to try and give a cool suggestion. I'm not even saying they have to be in OUR footsteps - actually, I imagined them in more the dinosaurs'. Yeah, I think it might be a little different. That's what happened with the early fish and the placoderms. The smaller fishies got a primitive lung, like today's lungfish. Placoderms didn't do that, so they were slowly out-competed. I'm asking, what if they managed to get on land? How could they do it, and what would happen afterwards?
Good suggestion, but I wasn't talking about the dinosaurs evolving from placoderms. I was saying the placoderms move on land, and take niches the dinosaurs would've normally held. Like for my D-Rex, I imagine the basic Dunkleosteus body, but instead of pectoral fins, there's armored legs. There's a tail still, but it's mostly a mouth with two legs. I'll get a pic up this summer, after exams, 'k? Maybe then, you'll see my unusual thinking. But other than that, it's a good idea, really. ^^ |
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| Spartan Delta | Jun 5 2009, 11:17 AM Post #49 |
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Ok, everyone. I know we've all been dying to see them, and now I can finally show you all my vision of the D-Rex.![]() So do ya think something like this could evolve? |
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| ATEK Azul | Jun 5 2009, 12:20 PM Post #50 |
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Transhuman
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These are awsome i think thats very possible and really cool looking. |
| I am dyslexic, please ignore the typo's! | |
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| Spartan Delta | Oct 1 2009, 11:46 AM Post #51 |
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Thanks. ^^ Sorry that it's taken ages for me to reply. |
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| ATEK Azul | Oct 1 2009, 12:36 PM Post #52 |
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Transhuman
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That is okay I am just glad the topic is back lets get some more ideas comming from here! I wonder if These could evolve mandibles simular to insects by spliting their lower jaws like a snake? |
| I am dyslexic, please ignore the typo's! | |
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| The Dodo | Oct 1 2009, 06:43 PM Post #53 |
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Prime Specimen
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It looks just like a T-Rex with armor, vicious looking thing. |
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| Holben | Oct 2 2009, 03:30 PM Post #54 |
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Rumbo a la Victoria
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Vicious=cool. |
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Time flows like a river. Which is to say, downhill. We can tell this because everything is going downhill rapidly. It would seem prudent to be somewhere else when we reach the sea. "It is the old wound my king. It has never healed." | |
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| Jurassic-Gothic | Oct 3 2009, 03:22 PM Post #55 |
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Actually fossil placoderms known show several similarities with chondrichthyans. Though not taxonomically related, their features resemble those of modern cartilagineous fishes: - Flat-body Rhenanids showed interesting stingray affinities - Coccosteids showed shark-like features (except well-known dorsal fin), although not active and specialized predators, whereas Dunkleosteids were - Rolfosteids showed long noses alike marlins and swordfishes - Rhamphodospids were quite chimaera-like creatures (see also Materpiscis, ovoviviparous too) - Phlyctaeniids were a bit different, but Antiarchs quite broke the rule someway, showing independent autapomorph features. Imagining land-dwelling Placoderm is surely an interesting speculative work, though, as for me, I would likely imagine more Placoderm specialize as Chondrichthyans have done up to modern times. I would see giant whale-size plankton-eater dunkleosteids, Manta-ray rhenanids, mako-shark coccosteids, marlin-nose rolfostedis and abyss-dwelling rhamphodopsids. Plus If I remember correctly, Antiarchs showed lung prints at fossil state. We don't know if those were actually lungs of homologue features and employed in dessication events too, but it's certain Antiarchs were both marine both freshwater dwellers. Well, an Ichthyostega-like bothriolepid wouldn't be unlikely at all, according to these assumptions... Edited by Jurassic-Gothic, Oct 3 2009, 03:24 PM.
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| Venatosaurus | Oct 3 2009, 03:32 PM Post #56 |
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HAUS OF SPEC
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This by far is my favorite rendition of terrestrial placoderms , http://nemo-ramjet.deviantart.com/art/A-Mind-is-a-Beautiful-Thing-81692814 . Nemo is a genius, isn't he !
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| Jurassic-Gothic | Oct 3 2009, 03:37 PM Post #57 |
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Fascinating, but not so feasible at all. According to me, at least. |
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| Carlos | Oct 3 2009, 03:40 PM Post #58 |
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Adveho in me Lucifero
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Yes, he is. I really wish placoderms had survivbed, because their diversity in the Devonian is astonishing, and I would love if they had time to perfect their diversity. Such an unfair world for placoderms to be gone |
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Lemuria: http://s1.zetaboards.com/Conceptual_Evolution/topic/5724950/ Terra Alternativa: http://s1.zetaboards.com/Conceptual_Evolution/forum/460637/ My Patreon: https://www.patreon.com/Carliro ![]() | |
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| Jurassic-Gothic | Oct 3 2009, 03:44 PM Post #59 |
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Unluckily Devonian landferns did produce anything but amber to conserve placoderms. Then to extract DNA and make a Spielberg-like Devonic Park *lol* *Feel free to ignore this fewly serious comment of mine* |
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| Venatosaurus | Oct 3 2009, 03:45 PM Post #60 |
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HAUS OF SPEC
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Imagine if some had gone amphibious similar to our own Mudskippers, they'd probably be able to live out of water longer aswell, as their armor would have retained water as well. |
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