het·er·o·mor·phic 
(hĕt′ə-rō-môrfĭk)
(hĕt′ə-rō-môrfĭk)adj.
1. Having different forms at different periods of the life cycle, as in stages of insect metamorphosis.
2. Differing from the standard form in size or structure: heteromorphic chromosome pairs.
het′er·o·morphism n.