There are two species of Merialus recognized so far, M. martinae and M. bruneti. Both have been found in Ypresian-age deposits in the Paris Basin.[1][2]
References
^D. E. Russell and M. Godinot. 1988. The Paroxyclaenidae (Mammalia) and a new form from the early Eocene of Palette, France. Paläontologische Zeitschrift 62(3/4):319-331
^Floréal Solé; Olivia Plateau; Kévin Le Verger; Alain Phélizon (2019). New paroxyclaenid mammals from the early Eocene of the Paris Basin (France) shed light on the origin and evolution of these endemic European cimolestans. Journal of Systematic Palaeontology Online edition. doi:10.1080/14772019.2018.1551248.