Talk:Diprotodon

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Pronunciation[edit]

How does one pronounce this? I always read it as dip-ro-TO-don, before I knew much about it, but now knowing the etymology of the word, I guess perhaps it is di-PRO-to-don? -postglock 05:49, 1 November 2006 (UTC)

The link to "diprotodon.com" seems to be a spam link.

It is indeed pronouced di-PRO-to-don. T.carnifex (talk) 04:50, 2 May 2008 (UTC)

Australis[edit]

Is it Diprotodon australis or Diprotodon optatum? Are these two different species? If they're the same, when did the naming change and why? T.carnifex (talk) 04:51, 2 May 2008 (UTC)

I think they're two different species (there is also D. minor)--Mr Fink (talk) 05:45, 2 May 2008 (UTC)

D. annextans[edit]

Would anyone know what the source is for this rather peculiar name? A search on Google Books turns up one reference in Prehistoric mammals of Australia and New Guinea ([1]) mentioning McCoy (1861). McCoy apparently did name at least one (putative?) species of Diprotodon, D. longiceps, but I didn't find anything more about D. annextans. The name does bear some resemblance with Trachodon annectens. Iblardi (talk) 00:08, 5 June 2008 (UTC)

Diprotodon annextans was erected on the basis of a broken mandible from a mature large-form individual collected from near Colac, Victoria. The original description was presented at a meeting to the Royal Society of Victoria (Anonymous, 1861).although the original paper was subsequently lost(McCoy, 1865). However, an abstract was later published regarding that specimen, but with a new name,D. longiceps (McCoy, 1865), and a holotype was subsequently described (McCoy, 1876). the dentary and associated dentition of D. annextans/longiceps is morphologically similar to and falls within the range of variation of specimens from all major Diprotodon assemblages. (see Price 2008)Vrkunkel(talk) —Preceding undated comment added 00:58, 18 October 2009 (UTC).

Mass[edit]

If it's only know from fossils, how can they come up with a mass of 2,786 kg? Most of the mass would be flesh, so how can the mass be known to such precision? I suppose it's a conversion thing, but 6,142 pounds is not a round number either. This source, BBC states "Weight: males 2000 to 2500kg; females 1000kg", which makes more sense, but it's smaller than 2786 kg, so I'm not sure which is correct. AtikuX (talk) 03:25, 27 June 2008 (UTC)

Body-size metrics to estimate fossil body volume are used. Basically these are logarithmic equations based on the craniodental data and the product of the lengths of the three major body axes (anteroposterior, transverse, and dorsoventral) of fossils if the morphology is similar to a living animal (in this case the Wombat), but while very accurate for placentals it was found it did not work for marsupials (This is due to Marsupials needing 20% less food than placentals of equal body mass) and is where the "2000 to 2500kg" came from. Since 2003, proximal limb-bone circumferences are also used for marsupials. If a 3.7 mtr Diprotodon was a placental it would weigh around 1,900 kg (the weight of a 3.7mtr Hippopotamus) but the marsupial specific measurement now gives a result of 2,786 kg with 95% accuracy (consistent with the difference between modern placentals and marsupials of similar size). The 2786 kg is the estimate for the Diprotodon displayed in the Australian Museum which is considered to be of average size. According to latest research the average male weight is now estimated at between 2272 kg and 3417 kg. Wayne (talk) 13:07, 6 July 2008 (UTC)
BTW..Results of calculations are not rounded to the nearest "neat" number which is why exact numbers are shown. Though it says 2786 it means the range for that particular specimen is around 2640 to 2940kg. Wayne (talk) 13:14, 6 July 2008 (UTC)
For our purposes there is nothing to be gained by displaying values with false precision; even 3 significant digits in the mass value is too many. This will only lead to confusion in those without an understanding of significant digits. Nearly everyone reading a scientific paper is savvy about such issues, but that is not the case for readers (and some editors) of Wikipedia. WolfmanSF (talk) 23:19, 31 December 2014 (UTC)
But Wikipedia articles are not supposed to interpret the sources, only reflect what they say. FunkMonk (talk) 01:01, 1 January 2015 (UTC)
Rounding estimates off appropriately is a routine and normally required procedure in science, not interpretation. WolfmanSF (talk) 22:52, 4 January 2015 (UTC)
One possible rationale for not rounding a mass estimate off would be if the value was an intermediate result that was to be used in further calculations. If, for example, you calculated mass estimates for a series of taxa, all using the same formula, and then wanted to look at ratios of body mass between taxa or of body mass to something else, rounding off before calculating the ratios might slightly degrade the accuracy of the final results. However, that rationale would not be applicable to Wikipedia. WolfmanSF (talk) 04:58, 5 January 2015 (UTC)
I think this needs a wider discussion. It is not at all clear that everyone would agree that all size estimates have to be rounded up. FunkMonk (talk) 05:35, 5 January 2015 (UTC)
Not all estimates, only those that are reported with false precision. Rounding off could be up or down, as the case may be. The comments apply to any measurement or estimate, not just body mass. WolfmanSF (talk) 16:45, 5 January 2015 (UTC)
In fact, Wikipedia does have a policy mandating rounding off, WP:NUMBERS#Uncertainty and rounding, which a mass value such as 2786 kg appears to violate. WolfmanSF (talk) 02:07, 8 January 2015 (UTC)
Like all "policies", it is only a guideline, and it specifically states it depends on the context. This still needs a wider discussion somewhere before one person can singlehandedly go around and mass change everything. I don't care much about this, but the mere fact that several people are reverting you should make you seek a discussion. FunkMonk (talk) 22:17, 14 January 2015 (UTC)
I have been reverted primarily by one individual, whose hysterical and sometimes dishonest edit summaries (Dinoguy2 did not revert me in Dreadnoughtus, and in fact reverted one of Christina1969's edits in Tyrannosaurus) don't really invite discussion. The whole subject of rounding off is sufficiently elementary that one person can and should be able to singlehandedly go around and change estimates that are being reported with false precision. However, I am happy to discuss any point that you or others wish to raise. WolfmanSF (talk) 02:10, 15 January 2015 (UTC)
I see others reverting you as well. It is common practice to announce mass changes somewhere before doing them, to prevent situations as then one you're currently in, which is pretty much an edit war over something of questionable significance. A good place to start: https://en.wikipedia.org/wiki/Wikipedia_talk:WikiProject_Palaeontology FunkMonk (talk) 05:58, 15 January 2015 (UTC)
Christina1969 (and his sock puppets) is the only one who has reverted to oppose rounding off in this article so far. WolfmanSF (talk) 21:10, 18 January 2015 (UTC)


in the article...[edit]

It's done a very fiece attempt to display how those beasts were killed by humans. I can't say if it was right, but still it's a bit biased as source and theory choose to support this POV — Preceding unsigned comment added by 159.20.209.65 (talk) 04:38, 6 June 2015 (UTC)