[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Re: Largest Camarasaurus specimens



Greg Paul's dinosaurs are all anorexic, therefore using his drawings
as a basis for GDI or so will lead to underestimates of the volume.
___________________________________
Dr. Heinrich Mallison
Abteilung Forschung
Museum für Naturkunde - Leibniz-Institut
für Evolutions- und Biodiversitätsforschung
an der Humboldt-Universität zu Berlin
Invalidenstrasse 43
10115 Berlin
Office phone: +49 (0)30 2093 8764
Email: heinrich.mallison@gmail.com
_____________________________________
Fere libenter homines id quod volunt credunt.
Gaius Julius Caesar


On Wed, May 23, 2012 at 7:44 PM, Zach Armstrong
<zach.armstrong64@yahoo.com> wrote:
> Giraffatitan also had a lot more neck (which is a lot less dense and not very 
> voluminous) and a lot less tail. I got a mass of 31 tonnes for Giraffatitan 
> doing a GDI off of Greg Paul's 1988 paper reconstruction (this used a 300 
> kg/m^3 density for the neck, 800 kg/m^3 for the torso and tail, and 1000 
> kg/m^3 for the limbs, with an overall average density of ~761 kg/m^3=0.761 
> kg/L). The largest specimens may have been a bit bigger, the "HMN XV2" 1340 
> mm fibula listed by Paul might have massed ~44 tonnes if scaled isometrically 
> to "HMN SII".
>
>
> Greg's mass estimate is probably too high for C. supremus (23 tonnes for a 18 
> meter specimen), but a 23 meter specimen scaled off of that would give a mass 
> of roughly 48 tonnes.
>
>
>
> ----- Original Message -----
>> From: Heinrich Mallison <heinrich.mallison@googlemail.com>
>> To: DML <dinosaur@usc.edu>
>> Cc:
>> Sent: Tuesday, May 22, 2012 4:42 PM
>> Subject: Re: Largest Camarasaurus specimens
>>
>> 47t is high for Giraffatitan - I got 48 t using a (probably too high)
>> density of 0.8 kg/L. For Camarasaurus, being a bit more sturdy, I can
>> believe 80% of the weight of G. at a stretch. Thus, using a more
>> realistic density of 0.6 or 0.8 kg/L, you'd end up with at most 34 t.
>> ___________________________________
>> Dr. Heinrich Mallison
>> Abteilung Forschung
>> Museum für Naturkunde - Leibniz-Institut
>> für Evolutions- und Biodiversitätsforschung
>> an der Humboldt-Universität zu Berlin
>> Invalidenstrasse 43
>> 10115 Berlin
>> Office phone: +49 (0)30 2093 8764
>> Email: heinrich.mallison@gmail.com
>> _____________________________________
>> Fere libenter homines id quod volunt credunt.
>> Gaius Julius Caesar
>>
>>
>> On Tue, May 22, 2012 at 11:38 PM, David Marjanovic
>> <david.marjanovic@gmx.at> wrote:
>>>>   Does any one have any references for the largest Camarasaurus
>>>>   specimens (especially C. supremus). I've heard size estimates of
>> 23
>>>>   meters long and 47 tonnes
>>>
>>>
>>>  I have no idea, but I can say with a fair amount of certainty that 47
>> tonnes
>>>  for a 23-m-long animal th
> dicrous. 10 t, OK; 20 t,
>> OK;
>>>  30 t, if it's proportioned like a sumo wrestler, why not. 47 t? No way.
>>>
>>>  I guess this figure was derived by measuring the water displacement of a
>>>  commercial model that violated Holtz's First Rule of Skeletal
>> Restoration*,
>>>  using the rounded density of an unspecified lizard.
>>>
>>>  * "If the skeleton doesn't fit inside the model, the model is
>> wrong."
>>