Marcel Bertolucci wrote-
And, by the way, what is the difference between _Huayangosaurus_ and _Kentrosaurus_, because I think they're in someway simillar to each other, or its just a 'dream' of mine?
Well, Kentrosaurus is a stegosaurid, while Huayangosaurus is a more basal stegosaur. So Kentrosaurus has derived characters like- dorsal margins of sacral ribs joined; prepubic process more than 50% length of postpubic process; femur at least 1.5 times longer than humerus; only two rows of dermal osteoderms. Huayangosaurus also has autapomorphies that distinguish it from other stegosaurs, including Kentrosaurus- intercostal flanges; flared distal rib ends; pisiform and radiale fused to carpal block. Similarily, Kentrosaurus has autapomorphies not present in Huayangosaurus, such as the greatly expanded preacetabular process. Other more obvious ways Kentrosaurus differs from Huayangosaurus are its higher dorsal neural arches, larger acromion process, longer postacetabular process, unexpanded distal pubis and several pairs of elongate caudal spines. The two are not especially closely related.
And are there any simillarities between _Liliensternus_ and _Dilophosaurus_?
Yes, but they're all either found in all coelophysoids (subnarial gap; presence of enlarged, fang-like teeth in the anterior part of the dentaries; posterior dorsal vertebrae considerably elongated; articular facet of the pubic peduncle of the ilium subdivided into an anterior part that faces anteriorly, and a posterior part that faces ventrally) or symplesiomorphic for theropods. I have not heard of any unique derived characters shared by the two.