Ametabolous

• (a.) Not undergoing any metamorphosis; as, ametabolic insects.
Found on http://thinkexist.com/dictionary/meaning/ametabolous/

Ametabolous

Without metamorphosis; that is, changing little in form during the course of growth and molting.
Found on http://www.ag.auburn.edu/enpl/courses/glossary.htm
No exact match found