Assertion: goldfish's fin | /r/CapableOf | appear as mutation
Facets:
value: in the ming dynasty
type: TEMPORAL
Source sentences:
text: The double caudal and anal fins of the twintail varieties appeared as mutations in the Ming dynasty (some 600 years ago), as did the absence of a dorsal fin; these three characters, together with the shorter, deeper body shape, go to make up the eggfish, which is the oldest of the short-bodied twintail types and is the basis of the lionhead, pompon, celestial and bubble eye types.