Myoglossata is a cohort of suborder Glossata

Glossata

Glossata is the suborder of the insect order Lepidoptera that includes all the superfamilies of moths and butterflies that have a coilable proboscis. ....

 within order Lepidoptera

Lepidoptera

Lepidoptera is a large order of insects that includes moths and butterflies . It is one of the most widespread and widely recognizable insect orders in the world, encompassing moths and the three superfamilies of butterflies, skipper butterflies, and moth-butterflies...

, the butterflies

Butterfly

A butterfly is a mainly day-flying insect of the order Lepidoptera, which includes the butterflies and moths. Like other holometabolous insects, the butterfly's life cycle consists of four parts: egg, larva, pupa and adult. Most species are diurnal. Butterflies have large, often brightly coloured...

 and moth

Moth

A moth is an insect closely related to the butterfly, both being of the order Lepidoptera. Moths form the majority of this order; there are thought to be 150,000 to 250,000 different species of moth , with thousands of species yet to be described...

s. It contains the subcohorts Myoglossata and Neolepidoptera. Myoglossata is considered a clade

Clade

A clade is a group consisting of a species and all its descendants. In the terms of biological systematics, a clade is a single "branch" on the "tree of life". The idea that such a "natural group" of organisms should be grouped together and given a taxonomic name is central to biological...

, that is, a group of organisms made up of a single common ancestor and all of its descendants. They are distinguished by "intrinsic mouthparts". These added intrinsic galeal muscles are unique to the Myoglossata and developed after the galeae changed to form sucking parts.