incertae sedis
adverb
in·cer·tae se·dis
in-ˈsər-tē-ˈsē-dəs 
: in an uncertain position : without assurance of relationship
—used of taxa
the enigmatic fossil arthropods were placed incertae sedis among the Myriopoda
Cite this Entry
“Incertae sedis.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/incertae%20sedis. Accessed 4 Nov. 2025.
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