Gazelle : The Palestinian Biological Bulletin (ISSN 0178 – 6288) . Number 120, December 2014, pp. 1-29. | Page 11

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Description
The type species of Amphicoelias, Amphicoelias altus, was named by paleontologist
Edward Drinker Cope in December 1877 (though not published until 1878) for an
incomplete skeleton consisting of two vertebrae, a pubis (hip bone), and
a femur (upper leg bone). Cope also named a second species, Amphicoelias latus,
in the same paper. However, all subsequent researchers have considered
Amphicoelias latus to be a synonym of Amphicoelias altus. In 1921, Osborn and
Mook assigned additional bones to Amphicoelias altus—a scapula (shoulder
blade), a coracoid (shoulder bone), an ulna (lower arm bone), and a tooth. Henry
Fairfield Osborn and Charles Craig Mook noted the overall close similarity
between Amphicoelias and Diplodocus, as well as a few key differences, such as
proportionally longer forelimbs in Amphicoelias than in Diplodocus. The femur
of Amphicoelias is unusually long, slender, and round in cross section; while this
roundness was once thought to be another distinguishing characteristic
of Amphicoelias, it has since been found in some specimens of Diplodocus as well.
A. altus was also similar in size to Diplodocus, estimated to be about 25 metres
(82 feet) long. While most scientists have used these details to distinguish
Amphicoelias and Diplodocus as separate genera, at least one has suggested
that Amphicoelias is probably the senior synonym of Diplodocus (Wikipedia).

‫ػظًت انؼضذ (انزساع انؼهىٌت) فً انذٌُاصىس صاوسوبىد رو انؼُق انطىٌم وانزٌم انسىطً وٌشجغ ػًشها إنى 333 يهٍىٌ سُت‬
ُ
‫وحى انؼثىس ػهٍها فً يحجشة داَا فً واٌىيٍُج فً انىالٌاث انًخحذة األيشٌكٍت فً انؼاو 6..0 وهً يؼشوضت حانٍا ً فً دبً يىل‬
304.140.32 4 ‫444 ػذست : أ4 د4 َىسياٌ ػهً بساو خهف انٍافاوي‬
A 155 million years old Humerus (upper arm) bone from the skeleton of the Long-necked Whiptailed Sauropod which was discovered in 2008 at the Dana Quarry in Wyoming, USA and is
displayed at Dubai Mall, Dubai, UAE. Photo by Prof. Dr. Norman Ali Khalaf-von Jaffa.
12.03.2014. https://www.flickr.com/photos/50022881@N00/13862270615/
Gazelle : The Palestinian Biological Bulletin – Number 120 – December 2014