Incertae sedis

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The technical term incertae sedis ( genitive from Latin incerta sedes "insecure seat"), abbreviated inc. sed. , in biological taxonomy denotes the uncertain systematic position of a taxon , for example the unclear assignment of a genus to a specific family .

In botany , the use of the term probably goes back to Antoine-Laurent de Jussieu , who in 1789 listed some “ plantae incertae sedis ” at the end of Genera Plantarum .


  • The fossil plant Paradinandra suecica could not be assigned to any family, but was assigned to incertae sedis within the order of the heather-like (when it was described in 2001).
  • The fossil Gluteus minimus , described in 1975, could not be assigned to any strain .
  • Amaurocichla bocagei is a species of passerine bird . Since it was unclear which family it belongs to, it has long been classified as Passeroidea incertae sedis .
  • The creature called the mold pig, which lived in the Tertiary and has similarities with tardigrade and mites.

Individual evidence

  1. ^ Erwin J. Hentschel, Günther H. Wagner : Zoological dictionary. Animal names, general biological, anatomical, physiological terms and short biographies . With an “Introduction to Terminology and Nomenclature”, a “Directory of Author's Names” and an “Overview of the System of the Animal Kingdom”. 6th edition. Gustav Fischer, Jena 1996, ISBN 3-334-60960-X , p. 324 .
  2. ^ Gerhard Wagenitz : Dictionary of Botany. Morphology, anatomy, taxonomy, evolution. 2nd, expanded edition. Nikol, Hamburg 2008, ISBN 978-3-937872-94-0 , p. 156.
  3. Jürg Schönenberger & Else Marie Friis: Fossil flowers of ericalean affinity from the Late Cretaceous of Southern Sweden . In: American Journal of Botany . 88, No. 3, 2001, pp. 467-480. doi : 10.2307 / 2657112 . PMID 11250825 .
  4. ^ Richard Arnold Davis & Holmes A. Semken, Jr .: Fossils of uncertain affinity from the Upper Devonian of Iowa . In: Science . 187, No. 4173, 1975, pp. 251-254. JSTOR 1739069 . doi : 10.1126 / science.187.4173.251 . PMID 17838783 .