Also, can we call the Ceratopsinal something else, like Triceronal?
I was ruminating on the following variations:
Triceranal, Triceradal, Tricerapal, Tricerapsal, Tricerotal, Ceratonal, Ceratopsal, Ceranal
Listen to them out loud and consider. Maybe GrayLinnorm could also opinionate. I'm unsure, both specifically about your suggestion, as well as which of all of them all are best understandable and pronouncable, as well as at least a little catchy. This is supposed to be the brute along with the other two armored dinopriminals (anky and steg) - and most intimidating and boisterous. Maybe I am leaving out a potential Rage ability - or one that I can include as an Effect Sigil. Plus, I am really just guesstimating the CRs and LAs.... I think they are balanced enough for near-epic campaigns, but I wouldn't really be able to tell unless it was play-tested, which is out of the question atm.
Also, if you want to supplement the Lambeonal in another way and keep the concept, try adding Secret and Lore class special abilities from the Loremaster PrC in the DMG instead of some of the Sigilry feats - in addition to a few extra SLAs to keep them powerful enough to hold strong against a force of demons or other outsiders, and epic or near-epic beings. Always more potential than the guardinals - the dinopriminals should in many ways be larger than life, and emblem-like paragons of the dino/prim races they embody and shepherd.
I am excited to see what is in store for us with the Psittaco-one, and have a great set of imagery for inspiration - I will have to go get them in a pdf, but many were easily found on Google. I also noticed that you have a knack for finding the hi-quality pix of those dinosaur cards (the stylish illustrations that I am unsure of their nature, but I believe they are some sort of playing card or dino trivia deck). I always find grainy small copies of them, and always less than the ones you have salvaged...
The only concept I didn't really emulate through the creature well was the Dimorphinal, which I had hoped to have somewhat sylvan, druidic, or bard-like spells/abilities, so that they might in some social ways be the performers or joy-causers of dinopriminal culture, especially when dealing with other good-aligned sentient races. I try to think of them as being a whole culture, and not segmented, as well as being diverse when compared - so they might make a really good and interesting line-up as an illustration if possible. That's why I kind of like the idea of some of them being bipedal, and others quadrupedal, while some have a tendency to both in different circumstances.
We are making great time on it so far, and I am gonna be out for a bit doing this estimate and proposal - probably until Tues or so... Hopefully then I can tag out one or two more in a jiffy and I can take a little time to post an index here on the dino/prim reviews/revisions.