The thoracic legs are quite long, and the larva bears great resemblance to the larvae of Trichoptera.

In general, however, they have three pairs of thoracic legs, each ending in two claws.

As mentioned, some have prolegs as well as "true" thoracic legs.

They have long thoracic legs with paired claws.

The thoracic legs are undeveloped or rudimentary, the abdomen long, slender, and often without appendages.

The thoracic legs are reduced, but always present and they locomote by rolling waves rather than walking with individual prolegs.

However, the main functions of the thoracic legs are respiration and carrying food forward to the mouth.

This contrasts with the related Isopoda, which have a single kind of thoracic leg.

A few of the defining characteristics of the class Insecta are three pairs of thoracic legs.

This is due to the long thoracic legs "and caudal appendages which are ever nervously twisting about".