incomplete data: for instance, the larval stage of an organism that cannot be matched up with an adult. It reflects a paucity of data that makes biological classification impossible.

A sciotaxon is defined as a taxon thought to be equivalent to a true taxon (orthotaxon), but whose identity cannot be established because the two candidate taxa are of a different nature and thus cannot be compared directly.

Examples

In zoology

Form taxa are groupings that are based on common overall forms. Early attempts at

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