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Ankylosaurian from Australia & Tarbosaurus/Tyrannosaurus



Ralph Molnar asked me to post the following new discovery on the dinonet:

'An
articulated, but incomplete ankylosaur skeleton was obtained from the
Albian Toolebuc Fm., northcentral Queensland, by the Queensland Museum.
It was originally collected by a local woman in 1992 & donated to the
Museum in September. It includes the shoulder girdle, rib cage, pelvis &
proximal tail, & at least one forelimb. Other limb material may be
present. The specimen is exposed from the ventral side, with the dorsum
still enclosed in rock. Its relationship to the much more complete
ankylosaur skeleton collected in 1990 (Minmi sp. nov.) is uncertain, as
that skeleton is exposed from the dorsal side, and the belly is still
under preparation.'

Also, Dr. Molnar has some data pertinent to the recent discussion on the
Tyrannosauridae.  From his observations of the type material of
Tyrannosaurus bataar Maleev 1955a and Tarbosaurus efremovi Maleev 1955b,
Molnar has concluded that these are two distinct species.  Thus,
Tyrannosaurus is present in Asia, but Tarbosaurus is (probably) a second
genus.  This leads to the interesting situation where two giant
tyrannosaurids are present in the same place at the same time (although
this occurred, at a smaller(?!?) scale with Gorgosaurus and Daspletosaurus
in the late Campanian of western North America).

George Olshevsky will have two-part article on the Tyrannosauridae in the
next two issues of the Japanese dinosaur magazine, Kyoryugaku Saizensen
(literally "Frontiers/Battleline/Frontline of Dinosaur Science", but
labeled in English "Dino Frontline").  In these articles he will propose
new generic names for Tyrannosaurus bataar, Albertosaurus? megagracilis,
and the "Jordan theropod" (Aublysodon mirandus of most authors, Aublysodon
molnari of Paul).  Given that Molnar (the world expert on tyrannosaurid
skulls) considers bataar to be Tyrannosaurus, I'd be cautious about a new
generic name for that species.  The others, however, might very well stand,
as long as they are proposed later in a refereed techincal journal.

                                
Thomas R. Holtz, Jr.                                   
tholtz@geochange.er.usgs.gov
Vertebrate Paleontologist in Exile                  Phone:      703-648-5280
U.S. Geological Survey                                FAX:      703-648-5420
Branch of Paleontology & Stratigraphy
MS 970 National Center
Reston, VA  22092
U.S.A.