The living habitat of the insect:
Another larva turned into pupa under a leaf after about 8 more days.
The beetle emerged after one week of the pupa stage.
The beetle is about 3 mm as shown below.
After seeing the adult (teneral) photos, friends and enthusiasts decided that this is indeed a Coccinellidae, confirmed by field experts. The latest suggested ID was that it should fall under the tribe Ortaliini (subfamily Ortaliinae), and the most probable genus Amida / Ortalia.
(ID credit: Adam Slipinski, Doug Yanega)
The rearing environment and observations:
The larvae was placed in the same species of plant it was found. The plant was potted and placed in the open space outdoor, shaded by tall roof, protected from heavy rain and hot sunshine.
The larvae source of food is unknown. Even though I had tried to place aphids, thrips and fungi on the leaves, they were not interested in them.
The white wax on the larvae was getting thinner and thinner day by day. Probably this was due to malnutrition or unsuitable temperature and humidity surrounding the environment. Also, there is a high possibility that its source of food was not present because of the different ecosystem of my backyard. It is also possible that its source of food is in the soil of its natural habitat.
A couple of hours after the teneral adult (above photo) appeared from the pupa, the colour did not change, and then flew off.
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