Sequential Centrosaurines, Batman!

[Mike Taylor <mike@indexdata.com>]

On pages 192-196 of their 1997 book _Dinosaur Lives: Unearthing an
Evolutionary Saga_, Horner and Dobb describe a sequence of
progressively more derived centrosaurines occurring successively in,
and immediately above, the upper Two Medicine formation.  The sequence
consists of _Styracosaurus_, "centrosaurine 1", _Einiosaurus_,
_Achelousaurus_ and _Pachyrhinosaurus_.  They (Horner and Dobb, not
the centrosaurines) comment that "centrosaurine 1" will shortly be
given a conventional binomen.

My question: has this animal been named since 1997, and if so, what is
it?  To the best of my very limited knowledge, the only other
recognised centrosaurines are _Centrosaurus_ itself, _Brachyceratops_
and _Avaceratops_, all of which were described and named long ago
(1904, 1914 and 1986, for anyone who wants to know), so it can't be
any of them.

Many thanks,

 _/|_    _______________________________________________________________
/o ) \/  Mike Taylor  <mike@indexdata.com>  http://www.miketaylor.org.uk
)_v__/\  "There is an element of truth in any idea that lasts long
         enough to be called corny" -- Irving Berlin.

--
Listen to my wife's new CD of kids' music, _Child's Play_, at
        http://www.pipedreaming.org.uk/childsplay/