Although most invertebrate species are still undescribed, a high diversity is displayed by certain
taxa. For example, Schmid (1984) estimated that India alone may support 4,000 species of caddisfly
(Trichoptera), with perhaps 50,000 species in the Oriental Region as a whole and the single genus
Chimarra (Phillopotamidae) may contain 500 Southeast Asian species (Malicky, 1989).