Genus names derived from present participles
Genus names whose last component is a present participle (usually ending in -ens or -ans), which is treated as a noun [Rule 10a], can be in any gender. The gender can be chosen by the original authors and if this did not happen can be chosen by later authors [Rule 65 (1)]. A list of genus names formed in that manner is provided below. Epithets derived from present participles are not listed here. A special case is genes, which originally is an Ancient Greek suffix meaning "born from" but is nowadays mainly used as a Neolatin suffix meaning "producing". See also the LPSN introductory page on forming names.