zygomatic arch morphology trait malar arch morphology trait VT:0004469 Any measurable or observable characteristic related to the shape, structure, color or pattern of the bony arch in vertebrates that extends along the side or front of the skull beneath the eye socket and is formed by the temporal process of the zygomatic bone and the zygomatic process of the temporal bone. zygoma morphology trait Trait.ontology orbit morphology trait