What does heteromorphism mean?
Heteromorphism is a biological term for the presence of different forms among individuals of the same species. The variations may involve body shape, size, coloration, structures, or other visible characteristics. Heteromorphism can occur between sexes, as in sexual dimorphism, or between distinct forms within a broader population. It is a specific type of polymorphism, which is the more general term for the coexistence of multiple forms in a species or population. The word is chiefly used in biology, ecology, and evolutionary studies, where precise descriptions of variation help scientists classify organisms and explain how distinct forms arise and function. In everyday writing, “different forms within a species” can usually communicate the same idea more simply. The term is especially useful when variation in physical form, rather than merely genetic or behavioral difference, is the central subject of discussion.
nounIn biology, heteromorphism is the condition in which individuals of the same species have different forms, appearances, or structures. It is a form of polymorphism and may include differences between the sexes, developmental stages, or ecological variants.
- The occurrence of different forms, appearances, or structures among individuals of the same species.
"The species displays heteromorphism, with some individuals having short wings and others having long, narrow wings."
"The study of heteromorphism showed that the population included both pale and dark forms of the moth."
"In evolutionary biology, researchers consider heteromorphism when comparing populations with markedly different body forms."
The plural is used when referring to multiple examples or cases of heteromorphism, although the uncountable form is also common.
"The researchers compared heteromorphisms found in several populations of the species."
Heteromorphism is nature’s reminder that a species can be a family of forms, not a single template.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does heteromorphism come from?
The word combines the Greek-derived prefix hetero-, meaning “different,” with morphē, meaning “form,” reflecting the scientific concept of unlike forms within a single species. The compound entered English as a specialized biological term and remains closely associated with the study of morphological variation.
How heteromorphism is actually used
This is a chiefly biological and scientific term. It is less common than the broader term “polymorphism” and is usually used when differences in form or appearance are the central focus.
Easily confused with heteromorphism
Polymorphism is the broader term for the existence of multiple forms within a species or population, whereas heteromorphism more specifically emphasizes differences in form among individuals or groups.