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1. Introduction The Eifelian rocks that crop out in southern Belgium and northern France (Fig. 1) have long been known for their highly diversified trilobite assemblages (e.g. Gosselet, 1884; Maillieux, 1904, 1907a, 1919, 1933, 1938; Richter, 1914; Lecompte, 1962). Records in the old literature chiefly encompass lists of outdated trilobite names. These are typically grouped according to obsolete stratigraphic divisions and come without references to the specimens. The only published accounts to contain useful descriptions and illustrations are those of Maillieux (1904, 1907b, 1938). After decades of little to no trilobite research in Belgium, Struve (1982b, 1985) described several phacopids from Eifelian strata between Couvin and Vireux-Molhain. Since then, a number of papers have dealt with Eifelian trilobites in the area (e.g. Magrean, 2007; Taghon et al., 2012; van Viersen, 2015, and references therein). During field excursions over the past years in southern Belgium the authors of the present paper noticed that the early Eifelian trilobite fauna shows marked differences from that of the upper Emsian. Genera such as Acastoides and Basidechenella do not cross the Eifelian boundary. This loss is more than fully compensated by the introduction of genera not known from older strata in the region. This work is the first part in a series of descriptions of early Eifelian trilobites from the Jemelle Formation in southern Belgium and northern France. Figure 1. Geological map of t

Early Middle Devonian trilobites and events in the Nismes – Vireux-Molhain area, southern border of the Dinant Synclinorium (Belgium, northern France)