The phrase "ancient appearance" is correct and usable in written English.
It can be used to describe something that looks very old or reminiscent of a time long past.
Example: "The ruins of the castle had an ancient appearance, evoking a sense of history and mystery."
Alternatives: "old-fashioned look" or "timeworn aspect".
Given that collectively the evidence for the ancient appearance of eukaryotes seems solid, the several hundred years of eukaryotic evolution before LECA requires explanation.
Also, the ancient appearance of TRP-N supports a common origin of important components of the nervous systems in Ctenophores, Cnidaria, and Bilateria.
The presence of eh1 motifs in Fox proteins of these phyla suggests an ancient appearance of this motif in the Fox gene family and therefore, a functional interaction with Groucho-related corepressors early in the evolution of the Fox gene family.
You can sprinkle flour and debris over the coffin to give it an ancient appearance, and throw in some fake cobwebs to make it look extra scary.
A still life with a pumpkin and a theatrical mask of Ancient Roman appearance is the epitome of the genre.
On Saturday and Sunday mornings the square is the setting for the ceremonial changing of the guard, ancient in appearance but recently introduced.
The gothic building that once housed the Bellevue Psychiatric Hospital loomed over the intersection of First Avenue and 30th Street; though ancient in appearance, it had yet to be built in 1893.
He worked with Vcelka to design Ancient Trader appearance, including paper textures and clouds.
Because of the rigid rules that governed its highly stylized and symbolic appearance, ancient Egyptian art served its political and religious purposes with precision and clarity.
The ancient Greeks observed that the appearance of Sirius heralded the hot and dry summer, and feared that it caused plants to wilt, men to weaken, and women to become aroused.
Since its appearance in ancient Egypt, the obelisk has been recontextualized many times over.
