endogean adjective 1noun 1forms 1 adjective1 •Relating to, or living in the soil or litter immediately beneath the surface noun1 •Any organism that lives in this regionWe also studied the female internal system for a species in the subgenus Aphaenops (Cerbaphaenops), and two species belonging to two other genera, one endogean (Geotrechus) and one epigean (Trechus). — 2015 formsendogeans