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Re: How many Mononykus?
Here are a few selected quotes of relevence from Hutchinson and
"Holtz (1995:511) noted that the Yale Peabody Museum (YPM)
specimen 1049 (type specimen of Ornithomimus minutus; Marsh 1892),
a partial metatarsus, could be a North American relative of Mononykus.
However, Novas (1996:694) stated that YPM 1049 is of inconclusive
"Here we report on a new alvarezsaurid specimen that conclusively
extends the geographic range of Alvarezsauridae into the latest
Cretaceous Lancian faunal connection."
"University of California Museum of Paleontology (UCMP) specimen
number 154584 consists of a virtually complete right pubis and partial
ischium from the UCMP locality V80092, known as the Sandstone Basin
(Hell Creek Formation: Garfield County, eastern Montana)."
"Total proximodistal length of the pubis from the cranial apex of its
preacetabular tubercle to the pubic apex is estimated at 100 mm;
preserved lengths of the proximal and distal pieces are 68 mm and 30 mm
"Unlike other known mononykine ischia, the ischium of UCMP 154584 is
substantially reduced compared to the pubis."
Hutchinson, J.R., and Chiappe, L.M. 1998. The first known
Alvarezsaurid (Theropoda: Aves) from North America. Journal of
Vertebrate Paleontology 18(3):447-450.