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Post by Supercommunist on Jul 8, 2014 10:07:42 GMT 5
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Post by creature386 on Jul 8, 2014 14:23:13 GMT 5
Since it is no media invention and given in the paper, I believe we can trust it so far. Not all estimates in papers get debunked.
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Post by theropod on Jul 8, 2014 16:09:05 GMT 5
I have a feeling that Argentavis may be heavier, and that this guy just has the slightly larger wingspan. Just like modern day albatrosses (with similar wing design) als have the highest wingspan, but are not the most massive volant birds. At least the paper→ seems to be referring to wingspan, not body mass |
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blaze
Paleo-artist 
Posts: 766
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Post by blaze on Jul 10, 2014 1:35:53 GMT 5
 I think is sufficiently complete to not get significantly downsized in the future, the abstract and the image above only mention/show 6.4m as the wingspan, closer to the lower end of the 6.1m-7.3m claimed by the news articles, I've read some versions of the story where the authors say that the wingspan of Argentavis was 5.7m-6.1m and that they estimated its no feathers wingspan at 4m as opposed to 5m for the new bird, still, I agree with theropod that larger winspan doesn't mean larger mass, as is the case with the albatross. |
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Fragillimus335
Member
Sauropod fanatic, and dinosaur specialist
Posts: 573
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Post by Fragillimus335 on Jul 11, 2014 3:29:40 GMT 5
I think Argentavis had a comparable wingspan to P. sandersi, eg ~6.5 meters. But it's weight has been estimated at ~70kg to Psandersi's ~28-40kg.
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blaze
Paleo-artist
Posts: 766
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Post by blaze on Dec 27, 2014 8:51:55 GMT 5
That's probably not the case, the humerus of P. sandersi is almost twice as long as that of Argentavis (57cm vs 94cm) and based on the more complete P. chilensis the skeletal length of each wing would be ~2.5m, for comparison Mayr et al. (2010) (and myself before reading that paper) estimate that of Argentavis at ~1.8m thus the only way for Argentavis to have longer wingspan is to have longer primaries, based on probable feather/wing proportions of living relatives the known Argentavis would not go past 6m flat in wingspan, even with estimated 1.5m long primaries, P. sandersi on the other hand can reach that with 40cm long primaries, with ones 1m+, as suggested by comparison with living analogues, there's no contest.
Weight is a different issue, the same equation that estimates P. sandersi at 40kg estimates Argentavis at 70kg but said equation does not include anything over 5kg in its sample size IIRC.
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