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Author Topic:   Pakicetus being presented with webbed feet.
Percy
Member
Posts: 22473
From: New Hampshire
Joined: 12-23-2000
Member Rating: 4.7


Message 271 of 305 (265018)
12-02-2005 10:04 AM
Reply to: Message 267 by Yaro
12-02-2005 9:11 AM


Re: Respond to what?
Yaro writes:
Hey Percy. Hooves aren't allways a "horse hoove"
Okay. But Gingerich believes the Pakicetus "hands and feet" were webbed. Can hooves be webbed?
--Percy

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 Message 267 by Yaro, posted 12-02-2005 9:11 AM Yaro has replied

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Yaro
Member (Idle past 6515 days)
Posts: 1797
Joined: 07-12-2003


Message 272 of 305 (265019)
12-02-2005 10:12 AM
Reply to: Message 271 by Percy
12-02-2005 10:04 AM


Re: Respond to what?
That's a good question.
I wonder if we could actually e-mail them and find out
ABE: gingeric@umich.edu
This message has been edited by Yaro, 12-02-2005 10:14 AM

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Coragyps
Member (Idle past 753 days)
Posts: 5553
From: Snyder, Texas, USA
Joined: 11-12-2002


Message 273 of 305 (265021)
12-02-2005 10:26 AM
Reply to: Message 269 by Percy
12-02-2005 9:37 AM


Re: Education versus Indocrination.
I think most here acknowledge the problem that textbook publishers tend to get locked into certain views and presentations that eventually become dated or misleading or wrong
And, just slightly OT, a lot of the distortions in textbooks are the direct result of fundamentalist Christians tampering with the textbook adoption process in places like this grand state I live in. I spent a day at the public hearings on biology texts for our high schools a couple of years back, and it wasn't a real pretty sight.

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Coragyps
Member (Idle past 753 days)
Posts: 5553
From: Snyder, Texas, USA
Joined: 11-12-2002


Message 274 of 305 (265022)
12-02-2005 10:30 AM
Reply to: Message 271 by Percy
12-02-2005 10:04 AM


Re: Respond to what?
Can hooves be webbed?
I'm pretty sure they can, as the hoof is really just sort of a glorified toenail at the end of a digit. The webbing of mammal webfeet is between digits, so the two features don't need to depend on each other. (Though a modern horse, having only one functional digit, would have a tough time deciding where to keep his web.)

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randman 
Suspended Member (Idle past 4918 days)
Posts: 6367
Joined: 05-26-2005


Message 275 of 305 (265071)
12-02-2005 3:06 PM
Reply to: Message 269 by Percy
12-02-2005 9:37 AM


Re: Education versus Indocrination.
Percy, it's the consistent manner in which the data is presented in an overstated fashion. Such and such lived millions of years ago and did this and that. Heck, I remember the tall tale that the precursors to humans lived in forests that turned to Savannahs, and so started standing upright, blah, blah,....The statements and depictions are given as facts when they are nothing more than very highly speculative guesses with very, very little data to support them.
It's the opposite of science. It's teaching fantasizing as the scientific method.
With only one skull, very little should have been presented on this animal. There was not enough evidence to even venture a good guess as to whether it was aquatic. There's no sense of responsibility within the evo community that I can tell. This kind of thing is not education. It's indoctrination, presenting wild guesses as factual claims.

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randman 
Suspended Member (Idle past 4918 days)
Posts: 6367
Joined: 05-26-2005


Message 276 of 305 (265075)
12-02-2005 3:09 PM
Reply to: Message 274 by Coragyps
12-02-2005 10:30 AM


Re: Respond to what?
Can you provide specific instances of webbed hooves?

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Modulous
Member
Posts: 7801
From: Manchester, UK
Joined: 05-01-2005


Message 277 of 305 (265077)
12-02-2005 3:22 PM
Reply to: Message 275 by randman
12-02-2005 3:06 PM


Re: Education versus Indocrination.
The statements and depictions are given as facts when they are nothing more than very highly speculative guesses with very, very little data to support them.
There is no chance of getting you to accept that there is more than very little data to support the guesses.
However, it raises an interesting point. Throughout time-things held to be scientific truths have been overturned by later generations, this has happened so often that anybody with a modicum of education has been exposed to this idea several times over. When something is presented as 'fact' by some people, it should be clear to the student that science is continuously being updated.
You are really asking that the tentativity of science be underscored as part of education. I agree.
With only one skull, very little should have been presented on this animal. There was not enough evidence to even venture a good guess as to whether it was aquatic.
Except of course, the evidence presented in this thread which discusses all the evidence available for making a good guess (eye positions, inferred diet, location of fossils, and its obvious similarity to an approximately contempory creature which was aquatic leads to the idea that this creature was at least semi-aquatic). If you want to, you can address this evidence.

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arachnophilia
Member (Idle past 1362 days)
Posts: 9069
From: god's waiting room
Joined: 05-21-2004


Message 278 of 305 (265085)
12-02-2005 4:06 PM
Reply to: Message 272 by Yaro
12-02-2005 10:12 AM


webbed hooves?
That's a good question.
I wonder if we could actually e-mail them and find out
ABE: gingeric@umich.edu
i suspect i know his answer too. something to the effect of: "we don't really know, but we can guess based on {x,y,z}, and anyways it's just a drawing."

אָרַח

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arachnophilia
Member (Idle past 1362 days)
Posts: 9069
From: god's waiting room
Joined: 05-21-2004


Message 279 of 305 (265091)
12-02-2005 4:36 PM
Reply to: Message 276 by randman
12-02-2005 3:09 PM


webbed hooves.
Can you provide specific instances of webbed hooves?
yes. the sitatunga (tragelaphus spekeii), which lives in central african swamps, is an artiodactyl (even-toed hooved ungulate) with webbing between its toes.
unfortunately, i can't find you a nice clear picture of its feet, but you'll have to trust all the biologists out in the field.
This message has been edited by arachnophilia, 12-02-2005 05:28 PM

אָרַח

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Yaro
Member (Idle past 6515 days)
Posts: 1797
Joined: 07-12-2003


Message 280 of 305 (265094)
12-02-2005 4:55 PM
Reply to: Message 279 by arachnophilia
12-02-2005 4:36 PM


Camels too
Dromedery Camels have webbed feet as well:
BBC - 404: Not Found
Habitat:
They are desert animals and have have numerous adaptations for life in an arid habitat. They have webbed feet (to prevent sinking in the sand); they can close their nostrils and they have a double row of eyelashes to keep out the sand. They can endure long periods without drinking - up to 17 days. When they do drink, they can take up to 136 litres (30 gallons) at a time. By producing dry faeces and little urine, they can conserve water. Their body temperature can rise 6-8 degree Celsius before sweating.

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Yaro
Member (Idle past 6515 days)
Posts: 1797
Joined: 07-12-2003


Message 281 of 305 (265095)
12-02-2005 4:58 PM
Reply to: Message 279 by arachnophilia
12-02-2005 4:36 PM


Hippos Too
An embarasment of riches! Guess we don't commonly think webbed hooves
Hippopotamus | African Wildlife Foundation
The hippo's proportions reflect its sedentary, amphibious existence. Its plump and bulky body is set on short, stumpy legs, with each foot having four toes. Although webbed, the toes splay enough to distribute the weight evenly over each toe and therefore adequately support the hippo on land.
ABE:
This message has been edited by Yaro, 12-02-2005 05:04 PM

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randman 
Suspended Member (Idle past 4918 days)
Posts: 6367
Joined: 05-26-2005


Message 282 of 305 (265097)
12-02-2005 5:13 PM
Reply to: Message 281 by Yaro
12-02-2005 4:58 PM


Re: Hippos Too
These examples, at least the 2 with pics, seem a little less webbed than the depiction of Paki though. Thanks nonetheless for providing some data here.

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Replies to this message:
 Message 283 by Coragyps, posted 12-02-2005 5:22 PM randman has replied
 Message 284 by Philip, posted 12-02-2005 5:29 PM randman has not replied
 Message 286 by arachnophilia, posted 12-02-2005 5:46 PM randman has replied

Coragyps
Member (Idle past 753 days)
Posts: 5553
From: Snyder, Texas, USA
Joined: 11-12-2002


Message 283 of 305 (265099)
12-02-2005 5:22 PM
Reply to: Message 282 by randman
12-02-2005 5:13 PM


Re: Hippos Too
These examples, at least the 2 with pics, seem a little less webbed than the depiction of Paki though.
What, everything that has webbed feet has to be webbed to the same degree now? You're pretty hard to please, Randman.

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Philip
Member (Idle past 4741 days)
Posts: 656
From: Albertville, AL, USA
Joined: 03-10-2002


Message 284 of 305 (265103)
12-02-2005 5:29 PM
Reply to: Message 282 by randman
12-02-2005 5:13 PM


Re: Humans Too
Humans, too, have toe-webs ...

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randman 
Suspended Member (Idle past 4918 days)
Posts: 6367
Joined: 05-26-2005


Message 285 of 305 (265104)
12-02-2005 5:39 PM
Reply to: Message 283 by Coragyps
12-02-2005 5:22 PM


Re: Hippos Too
Yes, it has to be relevant to the depictions which are very aquatic in nature without having sufficient evidence to make those claims. Now, we are stuck with absurdities as calling a hooved, land mammal a whale "for effect" as one evo poster here put it.
I think doing such things "for effect" is not proper science and indicative of a reasoning process deeply askew in terms of what the goal in science education should be.

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