19 July 2014

Life History of the Cycad Blue

Life History of the Cycad Blue (Chilades pandava pandava)

Butterfly Biodata:
Genus: Chilades Moore, 1881
Species: pandava Horsfield, 1829
Subspecies: pandava Horsfield, 1829
Wingspan of Adult Butterfly: 22-26mm
Caterpillar Local Host Plants: Cycas revoluta (Cycadaceae, common name: Sago Palm), Cycas rumphii (Cycadaceae).

Physical Description of Adult Butterfly:
On the upperside, the male is blue with thin black borders on both wings and it has a black tornal spot on the hindwing. The female is in paler blue with broad borders on the forewing and it has a series of submarginal spots on the hindwing, of which the spot in space 2 is crowned in orange. On the underside, both sexes are pale greyish brown. Both wings have the usual submarginal, marginal and post-discal series of spots and cell-end bars flanked with white. In the hindwing, there is a black spot in the cell, two black spots in space 7, another one just below vein 1a and orange-crowned tornal spots in spaces 1b and 2. There is a white-tipped filamentous tail at vein 2 in the hindwing.

Field Observations:
Cycad Blue is common in Singapore. The adults are usually observed flying in the vicinity of its host plant, the ornamental Sago Palm which can be found in many gardens in commercial, recreational and private residential areas. They are viewed as a pest by gardeners as their presence usually leaves the prized ornamental plants without new growth. The adults visits flowers for nectar and have the habit of sunbathing with open wings in sunny condition.