Callovosaurus and Diceratops

[endocrin@desktop.com.au (Graeme Worth)]

Can anyone tell me the current status of Callovosaurus? All I have is that
Camptosaurus leedsi is the type specimen for it. This came from The
Dinosauria but Callovosaurus is not listed as a valid genera (or anything
else, for that matter).
I saw an article in a magazine recently claiming that close examination of
the skull of Diceratops showed that it was in fact different from
Triceratops in lacking the nose horn. Anyone have any info on this? Is it
now a valid genus?
Thanks in advance
Graeme