In the heart of the Fagne, halfway between Chimay and Couvin, lies Lompret, one of the most beautiful villages in Wallonia. This village with its seemingly modest appearance, bordering the meanders of the 'Eau Blanche' river, boasts a very rich cultural and historical past. beyond its status as a landmark of the region's cultural and historical heritage, the subsoil of Lompret is also full of unsuspected geological and paleontological treasures dating back to the Frasnian.To honour all the amazing and unique finds that have been unearthed over the past 20 years, a temporary exhibition was erected in collaboration with the Musée du marbre de Rance, entitled: Lompret-Sur-Mer. in which the mineralogy, geology and paleo-ecology is presented to the visitors of the museum. This catalog gives an overview of the most important topics, discussed in this temporary exposition.

The classification and nomenclature of Devonian members of the lichid trilobite subfamily Trochurinae are reviewed. Previously claimed subjective synonymies of Lobopyge Přibyl & Erben, 1952 with Belenopyge Pek & Vaněk, 1991 and Akantharges Phleger, 1936 with Rhenarges Basse in Basse & Müller, 2004 are rejected. Basseiarges Corbacho & López- Soriano, 2013 is regarded as a junior subjective synonym of Akantharges. Huginarges Basse in Basse & Müller, 2004 is proposed as substitute name for the invalid trilobite genus Lobopyge. A revised hypothesised phylogeny of Devonian Trochurinae is proposed.

A new cornuproetine trilobite with nine thorax segments from upper Emsian strata in the NE Draa Valley (southern Morocco) is described as Timsaloproetus alissae sp. nov. Morphological evidence is reviewed to suggest a semi-endobenthic life mode, possibly with a carnivorous feeding habit.

Silurian to Middle Devonian members of Proetinae with in particular taxa that are morphologically similar to Gerastos are reviewed. Gerastos is widely distributed in Lower and Middle Devonian strata in the Rhenohercynian Basin (southern Laurussia), peri-Gondwana and northern Gondwana. Evolution of the group during the late Lower to Middle Devonian is consistent with a mosaic pattern and this has probably in part been to blame for the lack of consensus about its structure and relationships to morphologically similar genera. The distribution of Dohmiella, a former synonym of Gerastos, is mostly confined to the Eifelian of southern Laurussia with at least one species occurring in the Emsian of peri-Gondwana. Morphological trends in the Eifelian indicate a conservative morphology with mild convergences on other proetine genera such as Gerastos. Dohmiella and Gerastos form a Siluro-Devonian clade with Podoliproetus, Kegeliella, Orbitoproetus (including Helmutia), Myoproetus and Rhenocynproetus, should all those genera be retained. Longiproetus is once more restricted to its type species. Coniproetus (synonyms: Tropiconiproetus and Ryckholtia) is in need of revision because its present concept is polyphyletic. Bohemiproetus is taken as a group of vaulted Pragian proetines with affinities to Coniproetus but its type species should be revisited. Newly described taxa are: Gerastos cornix sp. nov., Dohmiella pooka sp. nov. (both from the Eifelian of Belgium) and Dohmiella pachyacanthophilia sp. nov. (Emsian of Spain). Key words: Trilobita, Proetidae, systematics, palaeogeography, Silurian, Devonian, new species.

Viersen, A.P. van, 2020 - Nouveaux trilobites dévoniens du Mur des douaniers (Nord de la France) et quelques associations connexes de Belgique. Fossiles, Rev. Franç. Pal., 42 : 42-50.