Species-specific morphology of the endolymphatic openings in the headshields of the osteostracan genus Tremataspis (Agnatha), from the Silurian of EstoniaMärss, Tiiu; Wilson, Mark V.H.; Viljus, Mart16th International Symposium on Early and Lower Vertebrates - Honoring Tiiu Märss & Philippe Janvier : Conference programme and abstracts : Valencia, Spain, 20222022 / p. 6http://iselv.uv.es/wp-content/uploads/2022/06/Abstract-Book-16ISELV_web.pdf