As examples of special protective resemblance observe inch- or span-worms (larv of geometrid moths).
Rivulet, riv′ū-let, n. a small stream, brook: a geometrid moth.
The Desmoscolecida move by looping their bodies like geometrid caterpillars or leeches, as well as by creeping on their setae.
By some systematists this small group of moths is treated as a subfamily of the geometrid.
geometrid: larva which, when walking, alternately elevate and straighten the middle of their body: opposed to rectigrade; q.v.
Among the Lepidoptera, we notice a reduction in the number of pro-legs in the 'looper' caterpillars of geometrid moths.