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Re: Ceratops (was RE Glishades ericksoni, ...)

----- Original Message ----
From: "heby@libero.it" <heby@libero.it>
>...Ceratops montanus posseses postorbital horncores procurved, which is an 
>apomorphic trait shared only with derived chasmosaurines, Albertaceratops and 
>MOR 692. Basal chasmosaurines (Chasmosaurus spp. Agujaceratops), 
>centrosaurines (the forthcoming >WahWeap Taxon plus some other undescribed 
>stuff), and basal ceratopsomorphs (Zuniceratops, Turanoceratops) have recurved 
>postorbital horncores. 

No. Aside from the fact that orientation of horncores is a trait strongly 
ontogenetically controlled,  Albertaceratops & MOR 692 both have procurving 
brow horns, as do (I believe) some horncores from the Zuniceratops bonebed.

The only reason I don't say fully ontogenetically controlled is that 
some taxa like Chasmosaurus may have posteriorly recurved brow horns as 
adults via paedomorhosis, and noone has yet tested the hypothesis of maturity 
in these Chasmosaurus specimens.


Denver Fowler