What does heteromorphy mean?
Heteromorphy is a formal biological term for the occurrence of different forms among organisms belonging to the same or a closely related species. It refers particularly to contrasting structures, appearances, or developmental patterns within a group. A familiar example is sexual dimorphism, in which males and females of one species differ greatly in size, coloration, or anatomy. Heteromorphy is especially useful in taxonomy, evolutionary biology, and the study of developmental variation, where precise comparison of body form matters. The word is uncommon outside specialist writing; in general prose, variation in form or morphological difference usually communicates the same idea more accessibly. Even so, heteromorphy provides a valuable scientific label for the striking phenomenon in which organisms grouped together by ancestry can look radically unlike one another.
nounThe occurrence of distinct forms in organisms of the same or a closely related species, especially differences in structure, appearance, or development within a single species.
- Differences in form, structure, or development among organisms of the same or a closely related species.
"Heteromorphy is especially evident in species whose males and females have markedly different body forms."
"Genetic changes can produce heteromorphy, as when males and females of the same species develop distinct body forms."
"The fossil record preserves clear examples of heteromorphy among closely related populations."
The plural is grammatically possible but uncommon; the phenomenon is often discussed as an uncountable noun.
"The study documented several heteromorphies among island populations of the same species."
One species, two forms: heteromorphy explains how closely related organisms can look radically different.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does heteromorphy come from?
Heteromorphy is built from Greek heteros, meaning other or different, and morphē, meaning form; the latter is also the source of morphology and related terms ending in -morphy. English developed the noun in scientific usage alongside heteromorphic and heteromorphism, which preserve the same Greek elements. More distant relatives such as polymorphism, dimorphism, and isomorphism combine other Greek prefixes with the same form root.
Related word forms
How heteromorphy is actually used
A formal, chiefly biological and taxonomic term. It is uncommon in general speech, where variation in form or morphological difference is usually more accessible.
Easily confused with heteromorphy
Heteromorphy emphasizes differences in form between organisms, whereas polymorphism describes the occurrence of multiple distinct forms within a population or species.