In Biology, the term trimorphic refers to a species of plant or animal possessing three differing phenotypes; forms, or morphs.
Generally, and certainly in the case of ants, there are no intermediate gradations between forms for this term to apply - no middle ground caste between 'minor' and 'major' or between 'major' and 'supermajor'. We are talking about distinct phenotypes in the worker caste (worker subcastes, in essence).
This is contrasted with dimorphic, meaning possesing two differing phenotypes.
Generally, we encounter this term when talking about species with a 'supermajor' (sometimes called 'supersoldier') worker subcaste in addition to the normal 'minor' and 'major'.
Tags: Morphology & Physiology
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