Genus Ascaris Linnaeus, 1758(uncertain > nomen dubium, Includes some species now assigned to Nemertea, also one species described as nematode, actually a dipteran larva)
Genus Borlasia Oken, 1815(uncertain > taxon inquirendum, Genus was established for B angliae Oken, 1815 – now syn. with Lineus longissimus but the generic name has subsequently been used for species since transferred to several other genera. No valid Borlasia-species exist today. )