Subjective junior synonym of G. quadrilobata in opinion of André et al. (2013). but retained as separate for fossil specimens by Spezzaferi et al (2015).
Hayward, B.W.; Le Coze, F.; Vachard, D.; Gross, O. (2024). World Foraminifera Database. Trilobatus trilobus (Reuss, 1850). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1027267 on 2024-09-18