In biology, a taxon (back-formation from taxonomy; plural taxa) is a group of one or more populations of an organism or organisms seen by taxonomists to form a unit. Although neither is required, a taxon is usually known by a particular name and given a particular ranking, especially if and when it is accepted or becomes established.It is very common, however, for taxonomists …

Form (Biologie), Taxon; Form (Computervirus), auf MS-DOS-Systemen; Form (Philosophie), Endzustand, den das Veränderte annimmt; Form (Recht), äußere Gestaltung eines Rechtsgeschäfts oder einer Rechtshandlung; Künste: Form (Kunst), äußere Gestalt in der bildenden Kunst; Literaturform, siehe Gattung (Literatur) musikalische Form, siehe ...

In phylogenetics, maximum parsimony is an optimality criterion under which the phylogenetic tree that minimizes the total number of character-state changes is to be preferred. Under the maximum-parsimony criterion, the optimal tree will minimize the amount of homoplasy (i.e., convergent evolution, parallel evolution, and evolutionary reversals).In other words, under this …