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RE: # of bones in Amargasaurus



Oops, the "2 each of ... interclavicle" should be the clavicle, which is paired 
unlike the interclavicle.  Keeps the total count the same anyway.

Mickey Mortimer

----------------------------------------
> Date: Sun, 21 Feb 2016 00:27:47 -0800
> From: mickey_mortimer111@msn.com
> To: darwinsbulldog@gmail.com; "dinosaur@usc.edu"@listproc.usc.edu
> Subject: RE: # of bones in Amargasaurus
>
> skull- 2 each of- premaxilla, maxilla, nasal, lacrimal, jugal, quadratojugal, 
> prefrontal, frontal, parietal, postorbital, squamosal, 
> exoccipital-opisthotic, prootic, laterosphenoid, orbitosphenoid, stapes, 
> quadrate, pterygoid, ectopterygoid, palatine, vomer
> 1 of- supraoccipital, basisoccipital, parabasisphenoid
> lower jaw- 2 each of- dentary, splenial, surangular, angular, prearticular, 
> articular
> 2 hyoids, ~20 sclerotic plates
> neck- 2 proatlases, 13 cervical vertebrae, 24 cervical ribs (the first 
> vertebra doesn't have any)
> back- 9 dorsal vertebrae, 18 dorsal ribs
> 1 fused sacrum
> tail- ~77 caudal vertebrae, ~47 chevrons
> pectoral girdle- 2 each of- scapula, coracoid, interclavicle, sternal plate
> 1 of- interclavicle
> ~10 sternal ribs, ~4 gastralia
> forelimb- 2 each of- humerus, radius, ulna, carpal, manual ungual
> 10 metacarpals, 10 manual phalanges
> pelvis- 2 each of- ilium, pubis, ischium
> hindlimb- 2 each of- femur, tibia, fibula, astragalus, calcaneum
> 10 metatarsals, 18 pedal phalanges, 6 pedal unguals
>
> So a final total of ~373 bones, ignoring teeth.  The number's not exact 
> because we have only one incomplete skeleton of Amargasaurus, so e.g. the 
> tail count is based on Janensch's (1936) reconstruction of the related 
> Dicraeosaurus, the skull, hands and feet on other diplodocoids, and the 
> pectoral area on the very new Tschopp and Mateus (2013) study available 
> online- 
> https://urldefense.proofpoint.com/v2/url?u=http-3A__onlinelibrary.wiley.com_doi_10.1111_joa.12012_pdf&d=CwIFAw&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=x82f3Wlkwtmbr1z8IAt9jA&m=op2vES4uQfRBnkzA8oh58RZIeAWRDSksRD90fMHLsus&s=q_7CFH_uy
Also, as dinosaurs grow they fuse more bones together, so in sauropods like 
Amargasaurus, the cervical ribs will fuse to the vertebrae, the scapula to the 
coracoid, the braincase will fuse together, etc..  Technically, in a young 
Amargasaurus, each vertebra is made of two bones- the upper and lower part, and 
that sacrum is five vertebrae
> and ten ribs.  It all makes the idea of an exact bone count impossible, but I 
> think I gave pretty standard fusion assumptions for a young adult sauropod.
>
> Mickey Mortimer
> The Theropod Database- 
> https://urldefense.proofpoint.com/v2/url?u=http-3A__theropoddatabase.com_&d=CwIFAw&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=x82f3Wlkwtmbr1z8IAt9jA&m=op2vES4uQfRBnkzA8oh58RZIeAWRDSksRD90fMHLsus&s=yWdk1Nc9vcNV-bvpDCz2922fPcICXFub-RGrtHkqMxM&e=
>
> ----------------------------------------
>> Date: Sat, 20 Feb 2016 09:22:25 -0800
>> From: darwinsbulldog@gmail.com
>> To: dinosaur@usc.edu
>> Subject: # of bones in Amargasaurus
>>
>> Hello - My 4th grade son is doing a short write up about Amargasaurus
>> for school. He would like to know how many bones there are in the
>> skeleton of Amargasaurus.
>>
>> Thanks for the help!
>>
>> <,,><
>>
>> Michael D. Barton
>> Portland, OR
>> darwinsbulldog@gmail.com
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