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apomorphy
This term is used exclusively within the specialized field of cladistics and evolutionary biology to describe a novel trait. It carries a neutral, technical connotation, serving as a precise marker for identifying evolutionary divergence. It is the direct opposite of a plesiomorphy, which refers to an ancestral trait.
In a phylogenetic context, an apomorphy is critical for defining a clade. When such a trait is shared by two or more taxa, it is termed a synapomorphy, which allows biologists to group organisms based on shared derived characteristics rather than primitive ones.
Meanings
Examples
The presence of feathers in birds is a clear example of an apomorphy.
We need to distinguish between a shared apomorphy and a primitive trait.
Is this specific bone structure an apomorphy or just a variation within the species?
The researcher identified a unique apomorphy that separated the two lineages.
I wonder if this trait is a true apomorphy or a result of convergent evolution.
The professor explained how an apomorphy helps define a new clade on the tree.
This morphological change represents a significant apomorphy for the group.
This morphological change represents a significant apomorphy for the group.
Let us examine the apomorphy that distinguishes the descendant from the ancestor.
The discovery of this apomorphy completely changed our understanding of the phylogeny.
The discovery of this apomorphy completely changed our understanding of the phylogeny.