trimorphism


Also found in: Dictionary, Encyclopedia, Wikipedia.

tri·mor·phism

(trī-mōr'fizm),
Existence under three forms, as in holometabolous insects that pass through larval, pupal, and imago stages.
[tri- + G. morphē, form]

trimorphism

the property exhibited by certain species of having or occurring in three distinct forms.
Mentioned in ?
References in periodicals archive ?
These difficulties make it hard to determine the precise points of particular evolutionary shifts, but the following broad conclusions can be drawn: (1) tristyly broke down to homostyly on multiple occasions within the family; (2) instances of enantiostyly in Monochoria and Heteranthera are not homologous; (3) there was probably one, but perhaps also a second, origin of tristyly; and (4) heteromorphic incompatibility arose after the origin of floral trimorphism.
Origin of Self-lncompatibility.--Whether its gain is equally or unequally weighted, self-incompatibility is shown to arise after the one or two origins of floral trimorphism inferred when shifts in floral form are unequally weighted.
What is perhaps more remarkable is the stability of floral trimorphism in the face of these ecological pressures.
Given the stability of trimorphism in isolated populations modeled in previous simulations (Eckert and Barrett 1992, fig.