rugulosity
/ˌruːɡjʊˈlɒsɪti/Zoology
noun
The state of being finely corrugated or wrinkled. Also (as a count noun): a small corrugation or wrinkle; a slight roughness.
Origin
Mid 19th century; earliest use found in Annals and Magazine of Natural History. From rugulose or rugulous + -ity: see -osity.