Larval, pupal and adult stages of the silkworm in the course of normal development and under juvenile hormone deficiency. The illustration accompanies a Perspective article “The silkworm coming of age – early” by René Feyereisen and Marek Jindra in PLoS Genetics (2012).

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3297579/?tool=pubmed