Parides gundlachianus alayoi
 
Parides gundlachianus, the Cuban cattleheart, is a species of butterfly in the family Papilionidae. It is an endemic species found only in Cuba. The name honours the Cuban naturalist Juan Gundlach.The wingspan is about 7 – 8 cm.
It is the brightest-coloured American swallowtail, and may be recognized by the brilliant blue bands on the forewing. The ground color is brown to black. The upperside forewing has a blue to green median band and possibly one to two spots close to the apex. The hindwings have a long tail and on either side two indentations like short tails. The upperside hindwing has a broad red submarginal band. A full description is provided by Rothschild, W. and Jordan, K. (1906)
 Parides gundlachianus occurs in the mountainous eastern part of the island, especially near the coast, where it is met with on flowers, and sometimes also drinking at pools.