Systematic catalogue of the Caddisflies of Panama (Trichoptera)

Abstract The Trichoptera are holmnetabolous insects which are often overlooked because of their similarity to Microlepidoptera. It is possible to distinguish adults of those two groups by the following characteristics. In Lepidoptera the proboscis (formed from the modified maxillae) is coiled; the maxillary palps are generally reduced or absent; and the body, and in most cases the wings, are covered with scales. In Trichoptera the mouthparts are reduced and the maxillae are not modified to form a coiled proboscis, although the palps are well developed; the body and wings bear setae, which make them appear hairy; and the wings occasionally bear some scales. The majority of Trichoptera larvae are aquatic (including one marine species) or are associated with wet soil. They resemble the larvae of certain aquatic Lepidoptera and Coleoptera. Trichopteran larvae may be distinguished from lepidopteran larvae by the absence of prolegs (false legs on the abdomen), present in all Lepidoptera. Trichopteran larvae usually can be distinguished from coleopteran larvae by the absence of cerci.