Isosticta gracilior Lieftinck, 1975

(Fig. 25)

Isosticta gracilior Lieftinck, 1975: 148 . Distribution (Fig. 26). Endemic to Grande Terre. This rare species is only known from six localities, all at low altitude. It has been recorded in low numbers at the sampling sites.

Habitat. The species occurs along rivers and streams flowing in forested plains or in hilly country on ultramafic soils.

Biology and behaviour. Adult stay close to the water and mating occurs at the edge of waterways. The biology of this species is unknown.

Status. The distribution of I. gracilior seems patchy but this may reflect a lack of observations. Because populations are rare and dispersed, we rank I. gracilior as EN.