Opisina is a monotypic moth genus in the family Xyloryctidae described by Francis Walker in 1864. Its only species, Opisina arenosella, the coconut black-headed caterpillar, was described by the same author in the same year. It is found in India, Sri Lanka, Bangladesh and Myanmar.
The wingspan is . Adults are grey.
The larvae are gregarious and are serious pests of coconut trees. They defoliate their host plant.