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From a merge: This is a redirect from a page that was merged into another page. This redirect was kept in order to preserve the edit history of this page after its content was merged into the content of the target page. Please do not remove the tag that generates this text (unless the need to recreate content on this page has been demonstrated) or delete this page.
For redirects with substantive page histories that did not result from page merges use {{R with history}} instead.
From a species to a genus: This is a redirect from a taxon's full binomial name (genus & species) to the taxon's higher level genus. Note that the practice of creating redirects from species names that could be articles is strongly discouraged.
Use {{R taxon with possibilities}} for redirects that could potentially be expanded into their own articles.
From a page move: This is a redirect from a page that has been moved (renamed). This page was kept as a redirect to avoid breaking links, both internal and external, that may have been made to the old page name.
To a monotypic taxon: This is a redirect from the only lower-ranking member of a monotypic fish taxon to its monotypic taxon. In a biology-related article, when for example a genus has only one species, the binomial name may be a redirect to the genus.
Use {{R from monotypic taxon}} instead when making a redirect from a monotypic taxon to its only member, for example, from a family name to its sole genus.
From a cross-project redirect: This is a redirect from a title linked to an item on Wikidata. The Wikidata item linked to this page is Caecobarbus geertsii (Q513217).